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aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#语法">语法</a></li><li class="document-toc-item "><a class="document-toc-link" href="#示例">示例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#规范">规范</a></li><li class="document-toc-item "><a class="document-toc-link" href="#浏览器兼容性">浏览器兼容性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#相关链接">相关链接</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/zh-CN/docs/Web/API/Window"><code>Window</code></a></li><li class="toggle"><details open=""><summary>实例属性</summary><ol><li><a href="/zh-CN/docs/Web/API/Window/caches"><code>caches</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/closed"><code>closed</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/console"><code>console</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/cookieStore"><code>cookieStore</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/credentialless"><code>credentialless</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/crossOriginIsolated"><code>crossOriginIsolated</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/crypto"><code>crypto</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/customElements"><code>customElements</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/devicePixelRatio"><code>devicePixelRatio</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/document"><code>document</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/documentPictureInPicture"><code>documentPictureInPicture</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/event"><code>event</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/external"><code>external</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/fence"><code>fence</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/frameElement"><code>frameElement</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/frames"><code>frames</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/fullScreen"><code>fullScreen</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/history"><code>history</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/indexedDB"><code>indexedDB</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/innerHeight"><code>innerHeight</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/innerWidth"><code>innerWidth</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/isSecureContext"><code>isSecureContext</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/launchQueue"><code>launchQueue</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/length"><code>length</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/localStorage"><code>localStorage</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/location"><code>location</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/locationbar"><code>locationbar</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/menubar"><code>menubar</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/mozInnerScreenX"><code>mozInnerScreenX</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/mozInnerScreenY"><code>mozInnerScreenY</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/name"><code>name</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/navigation"><code>navigation</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/navigator"><code>navigator</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/opener"><code>opener</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/orientation"><code>orientation</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/origin"><code>origin</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/originAgentCluster"><code>originAgentCluster</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/outerHeight"><code>outerHeight</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/outerWidth"><code>outerWidth</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/parent"><code>parent</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/performance"><code>performance</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/personalbar"><code>personalbar</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/scheduler"><code>scheduler</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/screen"><code>screen</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/screenLeft"><code>screenLeft</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/screenTop"><code>screenTop</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/screenX"><code>screenX</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/screenY"><code>screenY</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollbars"><code>scrollbars</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollMaxX"><code>scrollMaxX</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollMaxY"><code>scrollMaxY</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollX"><code>scrollX</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollY"><code>scrollY</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/self"><code>self</code></a></li><li><em><code>sessionStorage</code> </em></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/sharedStorage"><code>sharedStorage</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/speechSynthesis"><code>speechSynthesis</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/status"><code>status</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/statusbar"><code>statusbar</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/toolbar"><code>toolbar</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/top"><code>top</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/trustedTypes"><code>trustedTypes</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/visualViewport"><code>visualViewport</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/window"><code>window</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>实例方法</summary><ol><li><a href="/zh-CN/docs/Web/API/Window/alert"><code>alert()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/atob"><code>atob()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/back"><code>back()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/blur"><code>blur()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/btoa"><code>btoa()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/cancelAnimationFrame"><code>cancelAnimationFrame()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/cancelIdleCallback"><code>cancelIdleCallback()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/captureEvents"><code>captureEvents()</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/clearImmediate"><code>clearImmediate()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/clearInterval"><code>clearInterval()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/clearTimeout"><code>clearTimeout()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/close"><code>close()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/confirm"><code>confirm()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/createImageBitmap"><code>createImageBitmap()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/dump"><code>dump()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/fetch"><code>fetch()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/find"><code>find()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/focus"><code>focus()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/forward"><code>forward()</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/getComputedStyle"><code>getComputedStyle()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/getDefaultComputedStyle"><code>getDefaultComputedStyle()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/getScreenDetails"><code>getScreenDetails()</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/getSelection"><code>getSelection()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/matchMedia"><code>matchMedia()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/moveBy"><code>moveBy()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/moveTo"><code>moveTo()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/open"><code>open()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/postMessage"><code>postMessage()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/print"><code>print()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/prompt"><code>prompt()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/queryLocalFonts"><code>queryLocalFonts()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/queueMicrotask"><code>queueMicrotask()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/releaseEvents"><code>releaseEvents()</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/reportError"><code>reportError()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/requestAnimationFrame"><code>requestAnimationFrame()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/requestFileSystem"><code>requestFileSystem()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/requestIdleCallback"><code>requestIdleCallback()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/resizeBy"><code>resizeBy()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/resizeTo"><code>resizeTo()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scroll"><code>scroll()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollBy"><code>scrollBy()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollByLines"><code>scrollByLines()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollByPages"><code>scrollByPages()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/scrollTo"><code>scrollTo()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/setImmediate"><code>setImmediate()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/setInterval"><code>setInterval()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/setResizable"><code>setResizable()</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/setTimeout"><code>setTimeout()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/showDirectoryPicker"><code>showDirectoryPicker()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/showModalDialog"><code>showModalDialog()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/showOpenFilePicker"><code>showOpenFilePicker()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/showSaveFilePicker"><code>showSaveFilePicker()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/sizeToContent"><code>sizeToContent()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/stop"><code>stop()</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/structuredClone"><code>structuredClone()</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/webkitConvertPointFromNodeToPage"><code>webkitConvertPointFromNodeToPage()</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/webkitConvertPointFromPageToNode"><code>webkitConvertPointFromPageToNode()</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>事件</summary><ol><li><a href="/zh-CN/docs/Web/API/Window/afterprint_event"><code>afterprint</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/appinstalled_event"><code>appinstalled</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/beforeinstallprompt_event"><code>beforeinstallprompt</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/beforeprint_event"><code>beforeprint</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/beforeunload_event"><code>beforeunload</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/blur_event"><code>blur</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/copy_event"><code>copy</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/cut_event"><code>cut</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/devicemotion_event"><code>devicemotion</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/deviceorientation_event"><code>deviceorientation</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/deviceorientationabsolute_event"><code>deviceorientationabsolute</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/error_event"><code>error</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/focus_event"><code>focus</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/gamepadconnected_event"><code>gamepadconnected</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/gamepaddisconnected_event"><code>gamepaddisconnected</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/hashchange_event"><code>hashchange</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/languagechange_event"><code>languagechange</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/load_event"><code>load</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/message_event"><code>message</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/messageerror_event"><code>messageerror</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/offline_event"><code>offline</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/online_event"><code>online</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/orientationchange_event"><code>orientationchange</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/pagehide_event"><code>pagehide</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/pagereveal_event"><code>pagereveal</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/pageshow_event"><code>pageshow</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/pageswap_event"><code>pageswap</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/paste_event"><code>paste</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/popstate_event"><code>popstate</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/rejectionhandled_event"><code>rejectionhandled</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/resize_event"><code>resize</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/scrollsnapchange_event"><code>scrollsnapchange</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/scrollsnapchanging_event"><code>scrollsnapchanging</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/API/Window/storage_event"><code>storage</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/unhandledrejection_event"><code>unhandledrejection</code></a></li><li><a href="/zh-CN/docs/Web/API/Window/unload_event"><code>unload</code></a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/vrdisplayactivate_event"><code>vrdisplayactivate</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/vrdisplayconnect_event"><code>vrdisplayconnect</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/vrdisplaydeactivate_event"><code>vrdisplaydeactivate</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/vrdisplaydisconnect_event"><code>vrdisplaydisconnect</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/API/Window/vrdisplaypresentchange_event"><code>vrdisplaypresentchange</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li></ol></details></li><li class="toggle"><details open=""><summary>继承</summary><ol><li><a href="/zh-CN/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#语法">语法</a></li><li class="document-toc-item "><a class="document-toc-link" href="#示例">示例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#规范">规范</a></li><li class="document-toc-item "><a class="document-toc-link" href="#浏览器兼容性">浏览器兼容性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#相关链接">相关链接</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="zh-CN"><header><h1>Window.sessionStorage</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><h2>Baseline <span class="not-bold">Widely available</span></h2><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.</p><ul><li><a href="/zh-CN/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#浏览器兼容性" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fzh-CN%2Fdocs%2FWeb%2FAPI%2FWindow%2FsessionStorage&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p><code>sessionStorage</code> 属性允许你访问一个，对应当前源的 session <a href="/zh-CN/docs/Web/API/Storage"><code>Storage</code></a> 对象。它与 <a href="/zh-CN/docs/Web/API/Window/localStorage" title="localStorage"><code>localStorage</code></a> 相似，不同之处在于 <code>localStorage</code> 里面存储的数据没有过期时间设置，而存储在 <code>sessionStorage</code> 里面的数据在页面会话结束时会被清除。</p> <ul> <li>页面会话在浏览器打开期间一直保持，并且重新加载或恢复页面仍会保持原来的页面会话。</li> <li><strong>在新标签或窗口打开一个页面时会复制顶级浏览会话的上下文作为新会话的上下文，这点和 session cookie 的运行方式不同。</strong></li> <li>打开多个相同的 URL 的 Tabs 页面，会创建各自的 <code>sessionStorage</code>。</li> <li>关闭对应浏览器标签或窗口，会清除对应的 <code>sessionStorage</code>。</li> </ul> <div class="notecard note"> <p> <strong>备注：</strong>应该注意，存储在 sessionStorage 或 localStorage 中的数据<strong>特定于页面的协议</strong>。也就是说 <code>http://example.com</code> 与 <code>https://example.com</code> 的 sessionStorage 相互隔离。 </p> <p>被存储的键值对总是以 UTF-16 <a href="/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String">DOMString</a> 的格式所存储，其使用两个字节来表示一个字符。对于对象、整数 key 值会自动转换成字符串形式。</p> </div></div><section aria-labelledby="语法"><h2 id="语法"><a href="#语法">语法</a></h2><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// 保存数据到 sessionStorage sessionStorage.setItem("key", "value"); // 从 sessionStorage 获取数据 let data = sessionStorage.getItem("key"); // 从 sessionStorage 删除保存的数据 sessionStorage.removeItem("key"); // 从 sessionStorage 删除所有保存的数据 sessionStorage.clear(); </code></pre></div></div></section><section aria-labelledby="返回值"><h3 id="返回值"><a href="#返回值">返回值</a></h3><div class="section-content"><p>一个 <a href="/zh-CN/docs/Web/API/Storage"><code>Storage</code></a> 对象。</p></div></section><section aria-labelledby="示例"><h2 id="示例"><a href="#示例">示例</a></h2><div class="section-content"><p>下面的代码访问当前域名的 session <a href="/zh-CN/docs/Web/API/Storage"><code>Storage</code></a> 对象，并使用 <a href="/zh-CN/docs/Web/API/Storage/setItem"><code>Storage.setItem()</code></a> 访问往里面添加一个数据条目。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>sessionStorage.setItem("myCat", "Tom"); </code></pre></div> <p>下面的示例会自动保存一个文本输入框的内容，如果浏览器因偶然因素被刷新了，文本输入框里面的内容会被恢复，因此写入的内容不会丢失。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// 获取文本输入框 let field = document.getElementById("field"); // 检测是否存在 autosave 键值 // (这个会在页面偶然被刷新的情况下存在) if (sessionStorage.getItem("autosave")) { // 恢复文本输入框的内容 field.value = sessionStorage.getItem("autosave"); } // 监听文本输入框的 change 事件 field.addEventListener("change", function () { // 保存结果到 sessionStorage 对象中 sessionStorage.setItem("autosave", field.value); }); </code></pre></div> <div class="notecard note"> <p><strong>备注：</strong>完整的使用示例可以查看<a href="/zh-CN/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API">使用 Web Storage API</a> 一文。</p> </div></div></section><h2 id="规范"><a href="#规范">规范</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://html.spec.whatwg.org/multipage/webstorage.html#dom-sessionstorage-dev">HTML Standard <br/><small># dom-sessionstorage-dev</small></a></td></tr></tbody></table><h2 id="浏览器兼容性"><a href="#浏览器兼容性">浏览器兼容性</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><div class="section-content"><p> </p> 各浏览器支持的 localStorage 和 sessionStorage 容量上限不同。测试页面 <a href="http://dev-test.nemikor.com/web-storage/support-test/" class="external" target="_blank">detailed rundown of all the storage capacities for various browsers</a>。 <p></p> <div class="notecard note"> <p><strong>备注：</strong>从 iOS 5.1 之后，移动端的 Safari 将 localStorage 数据存储在 cache 文件中，在操作系统的要求下，会偶尔进行清除，特别是空间不足时。</p> </div></div><section aria-labelledby="相关链接"><h2 id="相关链接"><a href="#相关链接">相关链接</a></h2><div class="section-content"><ul> <li><a href="/zh-CN/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API">使用 Web Storage API</a></li> <li><a href="/zh-CN/docs/Web/API/Window/localStorage"><code>Window.localStorage</code></a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" 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Content available under <a href="/zh-CN/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/zh-CN/docs/Web/API/Window/sessionStorage","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"Window.sessionStorage","mdn_url":"/zh-CN/docs/Web/API/Window/sessionStorage","locale":"zh-CN","native":"中文 (简体)","browserCompat":["api.Window.sessionStorage"],"baseline":{"baseline":"high","baseline_high_date":"2018-01-29","baseline_low_date":"2015-07-29","support":{"chrome":"4","chrome_android":"18","edge":"12","firefox":"3.5","firefox_android":"6","safari":"4","safari_ios":"3.2"}},"sidebarHTML":"<ol><li class=\"section\"><a href=\"/zh-CN/docs/Web/API/Window\"><code>Window</code></a></li><li class=\"toggle\"><details open=\"\"><summary>实例属性</summary><ol><li><a href=\"/zh-CN/docs/Web/API/Window/caches\"><code>caches</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/closed\"><code>closed</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/console\"><code>console</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/cookieStore\"><code>cookieStore</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/credentialless\"><code>credentialless</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/crossOriginIsolated\"><code>crossOriginIsolated</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/crypto\"><code>crypto</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/customElements\"><code>customElements</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/devicePixelRatio\"><code>devicePixelRatio</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/document\"><code>document</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/documentPictureInPicture\"><code>documentPictureInPicture</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/event\"><code>event</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/external\"><code>external</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/fence\"><code>fence</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/frameElement\"><code>frameElement</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/frames\"><code>frames</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/fullScreen\"><code>fullScreen</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/history\"><code>history</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/indexedDB\"><code>indexedDB</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/innerHeight\"><code>innerHeight</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/innerWidth\"><code>innerWidth</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/isSecureContext\"><code>isSecureContext</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/launchQueue\"><code>launchQueue</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/length\"><code>length</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/localStorage\"><code>localStorage</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/location\"><code>location</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/locationbar\"><code>locationbar</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/menubar\"><code>menubar</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/mozInnerScreenX\"><code>mozInnerScreenX</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/mozInnerScreenY\"><code>mozInnerScreenY</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/name\"><code>name</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/navigation\"><code>navigation</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/navigator\"><code>navigator</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/opener\"><code>opener</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/orientation\"><code>orientation</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/origin\"><code>origin</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/originAgentCluster\"><code>originAgentCluster</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/outerHeight\"><code>outerHeight</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/outerWidth\"><code>outerWidth</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/parent\"><code>parent</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/performance\"><code>performance</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/personalbar\"><code>personalbar</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/scheduler\"><code>scheduler</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/screen\"><code>screen</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/screenLeft\"><code>screenLeft</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/screenTop\"><code>screenTop</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/screenX\"><code>screenX</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/screenY\"><code>screenY</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollbars\"><code>scrollbars</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollMaxX\"><code>scrollMaxX</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollMaxY\"><code>scrollMaxY</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollX\"><code>scrollX</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollY\"><code>scrollY</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/self\"><code>self</code></a></li><li><em><code>sessionStorage</code> </em></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/sharedStorage\"><code>sharedStorage</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/speechSynthesis\"><code>speechSynthesis</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/status\"><code>status</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/statusbar\"><code>statusbar</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/toolbar\"><code>toolbar</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/top\"><code>top</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/trustedTypes\"><code>trustedTypes</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/visualViewport\"><code>visualViewport</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/window\"><code>window</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>实例方法</summary><ol><li><a href=\"/zh-CN/docs/Web/API/Window/alert\"><code>alert()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/atob\"><code>atob()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/back\"><code>back()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/blur\"><code>blur()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/btoa\"><code>btoa()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/cancelAnimationFrame\"><code>cancelAnimationFrame()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/cancelIdleCallback\"><code>cancelIdleCallback()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/captureEvents\"><code>captureEvents()</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/clearImmediate\"><code>clearImmediate()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/clearInterval\"><code>clearInterval()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/clearTimeout\"><code>clearTimeout()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/close\"><code>close()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/confirm\"><code>confirm()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/createImageBitmap\"><code>createImageBitmap()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/dump\"><code>dump()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/fetch\"><code>fetch()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/find\"><code>find()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/focus\"><code>focus()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/forward\"><code>forward()</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/getComputedStyle\"><code>getComputedStyle()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/getDefaultComputedStyle\"><code>getDefaultComputedStyle()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/getScreenDetails\"><code>getScreenDetails()</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/getSelection\"><code>getSelection()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/matchMedia\"><code>matchMedia()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/moveBy\"><code>moveBy()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/moveTo\"><code>moveTo()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/open\"><code>open()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/postMessage\"><code>postMessage()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/print\"><code>print()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/prompt\"><code>prompt()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/queryLocalFonts\"><code>queryLocalFonts()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/queueMicrotask\"><code>queueMicrotask()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/releaseEvents\"><code>releaseEvents()</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/reportError\"><code>reportError()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/requestAnimationFrame\"><code>requestAnimationFrame()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/requestFileSystem\"><code>requestFileSystem()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/requestIdleCallback\"><code>requestIdleCallback()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/resizeBy\"><code>resizeBy()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/resizeTo\"><code>resizeTo()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scroll\"><code>scroll()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollBy\"><code>scrollBy()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollByLines\"><code>scrollByLines()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollByPages\"><code>scrollByPages()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/scrollTo\"><code>scrollTo()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/setImmediate\"><code>setImmediate()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/setInterval\"><code>setInterval()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/setResizable\"><code>setResizable()</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/setTimeout\"><code>setTimeout()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/showDirectoryPicker\"><code>showDirectoryPicker()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/showModalDialog\"><code>showModalDialog()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/showOpenFilePicker\"><code>showOpenFilePicker()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/showSaveFilePicker\"><code>showSaveFilePicker()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/sizeToContent\"><code>sizeToContent()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/stop\"><code>stop()</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/structuredClone\"><code>structuredClone()</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/webkitConvertPointFromNodeToPage\"><code>webkitConvertPointFromNodeToPage()</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/webkitConvertPointFromPageToNode\"><code>webkitConvertPointFromPageToNode()</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>事件</summary><ol><li><a href=\"/zh-CN/docs/Web/API/Window/afterprint_event\"><code>afterprint</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/appinstalled_event\"><code>appinstalled</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/beforeinstallprompt_event\"><code>beforeinstallprompt</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/beforeprint_event\"><code>beforeprint</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/beforeunload_event\"><code>beforeunload</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/blur_event\"><code>blur</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/copy_event\"><code>copy</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/cut_event\"><code>cut</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/devicemotion_event\"><code>devicemotion</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/deviceorientation_event\"><code>deviceorientation</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/deviceorientationabsolute_event\"><code>deviceorientationabsolute</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/error_event\"><code>error</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/focus_event\"><code>focus</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/gamepadconnected_event\"><code>gamepadconnected</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/gamepaddisconnected_event\"><code>gamepaddisconnected</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/hashchange_event\"><code>hashchange</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/languagechange_event\"><code>languagechange</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/load_event\"><code>load</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/message_event\"><code>message</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/messageerror_event\"><code>messageerror</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/offline_event\"><code>offline</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/online_event\"><code>online</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/orientationchange_event\"><code>orientationchange</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/pagehide_event\"><code>pagehide</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/pagereveal_event\"><code>pagereveal</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/pageshow_event\"><code>pageshow</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/pageswap_event\"><code>pageswap</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/paste_event\"><code>paste</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/popstate_event\"><code>popstate</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/rejectionhandled_event\"><code>rejectionhandled</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/resize_event\"><code>resize</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/scrollsnapchange_event\"><code>scrollsnapchange</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/scrollsnapchanging_event\"><code>scrollsnapchanging</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/API/Window/storage_event\"><code>storage</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/unhandledrejection_event\"><code>unhandledrejection</code></a></li><li><a href=\"/zh-CN/docs/Web/API/Window/unload_event\"><code>unload</code></a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/vrdisplayactivate_event\"><code>vrdisplayactivate</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/vrdisplayconnect_event\"><code>vrdisplayconnect</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/vrdisplaydeactivate_event\"><code>vrdisplaydeactivate</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/vrdisplaydisconnect_event\"><code>vrdisplaydisconnect</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/API/Window/vrdisplaypresentchange_event\"><code>vrdisplaypresentchange</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>继承</summary><ol><li><a href=\"/zh-CN/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><code>sessionStorage</code> 属性允许你访问一个，对应当前源的 session <a href=\"/zh-CN/docs/Web/API/Storage\"><code>Storage</code></a> 对象。它与 <a href=\"/zh-CN/docs/Web/API/Window/localStorage\" title=\"localStorage\"><code>localStorage</code></a> 相似，不同之处在于 <code>localStorage</code> 里面存储的数据没有过期时间设置，而存储在 <code>sessionStorage</code> 里面的数据在页面会话结束时会被清除。</p>\n<ul>\n <li>页面会话在浏览器打开期间一直保持，并且重新加载或恢复页面仍会保持原来的页面会话。</li>\n <li><strong>在新标签或窗口打开一个页面时会复制顶级浏览会话的上下文作为新会话的上下文，这点和 session cookie 的运行方式不同。</strong></li>\n <li>打开多个相同的 URL 的 Tabs 页面，会创建各自的 <code>sessionStorage</code>。</li>\n <li>关闭对应浏览器标签或窗口，会清除对应的 <code>sessionStorage</code>。</li>\n</ul>\n<div class=\"notecard note\">\n <p>\n <strong>备注：</strong>应该注意，存储在 sessionStorage 或 localStorage 中的数据<strong>特定于页面的协议</strong>。也就\n 是说 <code>http://example.com</code> 与 <code>https://example.com</code> 的 sessionStorage 相互隔离。\n </p>\n <p>被存储的键值对总是以 UTF-16 <a href=\"/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String\">DOMString</a> 的格式所存储，其使用两个字节来表示一个字符。对于对象、整数 key 值会自动转换成字符串形式。</p>\n</div>"}},{"type":"prose","value":{"id":"语法","title":"语法","isH3":false,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// 保存数据到 sessionStorage\nsessionStorage.setItem(\"key\", \"value\");\n\n// 从 sessionStorage 获取数据\nlet data = sessionStorage.getItem(\"key\");\n\n// 从 sessionStorage 删除保存的数据\nsessionStorage.removeItem(\"key\");\n\n// 从 sessionStorage 删除所有保存的数据\nsessionStorage.clear();\n</code></pre></div>"}},{"type":"prose","value":{"id":"返回值","title":"返回值","isH3":true,"content":"<p>一个 <a href=\"/zh-CN/docs/Web/API/Storage\"><code>Storage</code></a> 对象。</p>"}},{"type":"prose","value":{"id":"示例","title":"示例","isH3":false,"content":"<p>下面的代码访问当前域名的 session <a href=\"/zh-CN/docs/Web/API/Storage\"><code>Storage</code></a> 对象，并使用 <a href=\"/zh-CN/docs/Web/API/Storage/setItem\"><code>Storage.setItem()</code></a> 访问往里面添加一个数据条目。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>sessionStorage.setItem(\"myCat\", \"Tom\");\n</code></pre></div>\n<p>下面的示例会自动保存一个文本输入框的内容，如果浏览器因偶然因素被刷新了，文本输入框里面的内容会被恢复，因此写入的内容不会丢失。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// 获取文本输入框\nlet field = document.getElementById(\"field\");\n\n// 检测是否存在 autosave 键值\n// (这个会在页面偶然被刷新的情况下存在)\nif (sessionStorage.getItem(\"autosave\")) {\n // 恢复文本输入框的内容\n field.value = sessionStorage.getItem(\"autosave\");\n}\n\n// 监听文本输入框的 change 事件\nfield.addEventListener(\"change\", function () {\n // 保存结果到 sessionStorage 对象中\n sessionStorage.setItem(\"autosave\", field.value);\n});\n</code></pre></div>\n<div class=\"notecard note\">\n <p><strong>备注：</strong>完整的使用示例可以查看<a href=\"/zh-CN/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API\">使用 Web Storage API</a> 一文。</p>\n</div>"}},{"type":"specifications","value":{"title":"规范","id":"规范","isH3":false,"specifications":[{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/webstorage.html#dom-sessionstorage-dev","title":"HTML Standard"}],"query":"api.Window.sessionStorage"}},{"type":"browser_compatibility","value":{"title":"浏览器兼容性","id":"浏览器兼容性","isH3":false,"query":"api.Window.sessionStorage"}},{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>\n </p>\n 各浏览器支持的 localStorage 和 sessionStorage 容量上限不同。测试页面 <a href=\"http://dev-test.nemikor.com/web-storage/support-test/\" class=\"external\" target=\"_blank\">detailed rundown of all the storage capacities for various browsers</a>。\n<p></p>\n<div class=\"notecard note\">\n <p><strong>备注：</strong>从 iOS 5.1 之后，移动端的 Safari 将 localStorage 数据存储在 cache 文件中，在操作系统的要求下，会偶尔进行清除，特别是空间不足时。</p>\n</div>"}},{"type":"prose","value":{"id":"相关链接","title":"相关链接","isH3":false,"content":"<ul>\n <li><a href=\"/zh-CN/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API\">使用 Web Storage API</a></li>\n <li><a href=\"/zh-CN/docs/Web/API/Window/localStorage\"><code>Window.localStorage</code></a></li>\n</ul>"}}],"toc":[{"text":"语法","id":"语法"},{"text":"示例","id":"示例"},{"text":"规范","id":"规范"},{"text":"浏览器兼容性","id":"浏览器兼容性"},{"text":"相关链接","id":"相关链接"}],"summary":"sessionStorage 属性允许你访问一个，对应当前源的 session Storage 对象。它与 localStorage 相似，不同之处在于 localStorage 里面存储的数据没有过期时间设置，而存储在 sessionStorage 里面的数据在页面会话结束时会被清除。","popularity":0.0089,"modified":"2024-07-29T11:15:40.000Z","other_translations":[{"locale":"de","title":"Window: sessionStorage-Eigenschaft","native":"Deutsch"},{"locale":"en-US","title":"Window: sessionStorage property","native":"English (US)"},{"locale":"es","title":"Window.sessionStorage","native":"Español"},{"locale":"fr","title":"Window.sessionStorage","native":"Français"},{"locale":"ja","title":"Window: sessionStorage プロパティ","native":"日本語"},{"locale":"ko","title":"Window.sessionStorage","native":"한국어"},{"locale":"pt-BR","title":"Window.sessionStorage","native":"Português (do Brasil)"},{"locale":"ru","title":"Window: свойство sessionStorage","native":"Русский"},{"locale":"zh-TW","title":"Window.sessionStorage","native":"正體中文 (繁體)"}],"pageType":"unknown","source":{"folder":"zh-cn/web/api/window/sessionstorage","github_url":"https://github.com/mdn/translated-content/blob/main/files/zh-cn/web/api/window/sessionstorage/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/086cc4852d5cca2490b3ba1d87903a01dfc6013f","filename":"index.md"},"short_title":"Window.sessionStorage","parents":[{"uri":"/zh-CN/docs/Web","title":"面向开发者的 Web 技术"},{"uri":"/zh-CN/docs/Web/API","title":"Web API"},{"uri":"/zh-CN/docs/Web/API/Window","title":"Window"},{"uri":"/zh-CN/docs/Web/API/Window/sessionStorage","title":"Window.sessionStorage"}],"pageTitle":"Window.sessionStorage - Web API | MDN","noIndexing":false}}</script></body></html>