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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="#範例">範例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參考">參考</a></li><li class="document-toc-item "><a class="document-toc-link" href="#教程指南">教程指南</a></li><li class="document-toc-item "><a class="document-toc-link" href="#資源">資源</a></li><li class="document-toc-item "><a class="document-toc-link" href="#規範">規範</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參見">參見</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><em><a href="/zh-TW/docs/Web/API/Canvas_API" aria-current="page">Canvas API</a></em></li><li class="toggle"><details open=""><summary>指南</summary><ol><li><a href="/zh-TW/docs/Web/API/Canvas_API/Manipulating_video_using_canvas">Manipulating video using canvas</a></li></ol></details></li><li class="toggle"><details open=""><summary>教學</summary><ol><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial">Canvas 教學文件</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Basic_usage">Canvas 基本用途</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes">繪製圖形</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors">套用樣式與顏色</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Drawing_text">使用canvas繪製文字</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Using_images">使用影像</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Transformations">變形效果</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Compositing">合成效果</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Basic_animations">基礎動畫</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Advanced_animations">Advanced animations</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas">Pixel manipulation with canvas</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Optimizing_canvas">最佳化canvas</a></li><li><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Finale">Finale</a></li></ol></details></li><li class="toggle"><details open=""><summary>介面</summary><ol><li><a href="/zh-TW/docs/Web/API/CanvasGradient"><code>CanvasGradient</code></a></li><li><a href="/zh-TW/docs/Web/API/CanvasPattern"><code>CanvasPattern</code></a></li><li><a href="/zh-TW/docs/Web/API/CanvasRenderingContext2D"><code>CanvasRenderingContext2D</code></a></li><li><a href="/zh-TW/docs/Web/API/HTMLCanvasElement"><code>HTMLCanvasElement</code></a></li><li><a href="/zh-TW/docs/Web/API/ImageBitmap"><code>ImageBitmap</code></a></li><li><a href="/zh-TW/docs/Web/API/ImageBitmapRenderingContext"><code>ImageBitmapRenderingContext</code></a></li><li><a href="/zh-TW/docs/Web/API/ImageData"><code>ImageData</code></a></li><li><a href="/zh-TW/docs/Web/API/OffscreenCanvas"><code>OffscreenCanvas</code></a></li><li><a href="/zh-TW/docs/Web/API/OffscreenCanvasRenderingContext2D"><code>OffscreenCanvasRenderingContext2D</code></a></li><li><a href="/zh-TW/docs/Web/API/Path2D"><code>Path2D</code></a></li><li><a href="/zh-TW/docs/Web/API/TextMetrics"><code>TextMetrics</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>方法</summary><ol><li><a href="/zh-TW/docs/Web/API/Window/createImageBitmap"><code>Window.createImageBitmap()</code></a></li><li><a href="/zh-TW/docs/Web/API/WorkerGlobalScope/createImageBitmap"><code>WorkerGlobalScope.createImageBitmap()</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="#範例">範例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參考">參考</a></li><li class="document-toc-item "><a class="document-toc-link" href="#教程指南">教程指南</a></li><li class="document-toc-item "><a class="document-toc-link" href="#資源">資源</a></li><li class="document-toc-item "><a class="document-toc-link" href="#規範">規範</a></li><li class="document-toc-item "><a class="document-toc-link" href="#參見">參見</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-TW"><header><h1>Canvas API</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-TW/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#瀏覽器相容性" 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-TW%2Fdocs%2FWeb%2FAPI%2FCanvas_API&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><strong><a href="/zh-TW/docs/Web/HTML/Element/canvas"><code><canvas></code></a></strong> 是 <a href="/zh-TW/docs/Web/HTML">HTML5</a> 的新元素，可透過 Script（通常是 <a href="/zh-TW/docs/Web/JavaScript">JavaScript</a>）繪製圖形。例如，可以用來繪圖、合成圖照片、建立動畫、甚至處理即時的影片播放。</p> <p>Mozilla 應用程式從 Gecko 1.8（也就是 <a class="page-not-created" title="此說明文件尚未被撰寫，期待你的貢獻！" data-href="/zh-TW/Firefox_1.5_for_developers">Firefox 1.5</a>）起開始支援 <code><canvas></code>。這個元素最初由蘋果 OS X <a href="https://www.apple.com/macosx/features/dashboard/" class="external" target="_blank">Dashboard</a> 和 Safari 引入。Internet Explorer 9 以上版本也有支援 <code><canvas></code>，但較舊的 IE 版本則須嵌入 Google <a href="http://excanvas.sourceforge.net/" class="external" target="_blank">Explorer Canvas</a> 專案中的程式腳本，才能得到有效的支援。Opera 9 也支援 <code><canvas></code>。</p> <p><code><canvas></code> 元素通常也被 <a href="/en-US/docs/Web/API/WebGL_API" class="only-in-en-us" title="此頁面目前僅提供英文版本">WebGL</a> 用來在網頁上顯示使用硬體加速繪製的 3D 圖形。</p></div><section aria-labelledby="範例"><h2 id="範例"><a href="#範例">範例</a></h2><div class="section-content"><p>這則簡單的範例使用了<a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/CanvasRenderingContext2D/fillRect"><code>CanvasRenderingContext2D.fillRect()</code></a>這個方法。</p></div></section><section aria-labelledby="html"><h3 id="html"><a href="#html">HTML</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">html</span></div><pre class="brush: html notranslate"><code><canvas id="canvas"></canvas> </code></pre></div></div></section><section aria-labelledby="javascript"><h3 id="javascript"><a href="#javascript">JavaScript</a></h3><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>var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.fillStyle = "green"; ctx.fillRect(10, 10, 100, 100); </code></pre></div> <p>Edit the code below and see your changes update live in the canvas:</p> <div class="code-example"><pre class="brush: html hidden notranslate"><code><canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> <div class="playable-buttons"> <input id="edit" type="button" value="Edit" /> <input id="reset" type="button" value="Reset" /> </div> <textarea id="code" class="playable-code"> ctx.fillStyle = "green"; ctx.fillRect(10, 10, 100, 100);</textarea > </code></pre></div> <div class="code-example"><pre class="brush: js hidden notranslate"><code>var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); var textarea = document.getElementById("code"); var reset = document.getElementById("reset"); var edit = document.getElementById("edit"); var code = textarea.value; function drawCanvas() { ctx.clearRect(0, 0, canvas.width, canvas.height); eval(textarea.value); } reset.addEventListener("click", function () { textarea.value = code; drawCanvas(); }); edit.addEventListener("click", function () { textarea.focus(); }); textarea.addEventListener("input", drawCanvas); window.addEventListener("load", drawCanvas); </code></pre></div><div class="code-example"><div class="example-header"></div><iframe class="sample-code-frame" title="範例 sample" id="frame_範例" width="700" height="360" src="about:blank" data-live-path="/zh-TW/docs/Web/API/Canvas_API" data-live-id="範例" sandbox="allow-same-origin allow-scripts" loading="lazy"></iframe></div></div></section><section aria-labelledby="參考"><h2 id="參考"><a href="#參考">參考</a></h2><div class="section-content"><ul> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/HTMLCanvasElement"><code>HTMLCanvasElement</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/CanvasRenderingContext2D"><code>CanvasRenderingContext2D</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/CanvasGradient"><code>CanvasGradient</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/CanvasPattern"><code>CanvasPattern</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/ImageBitmap"><code>ImageBitmap</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/ImageData"><code>ImageData</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/TextMetrics"><code>TextMetrics</code></a></li> <li><a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/API/Path2D"><code>Path2D</code></a> <abbr class="icon icon-experimental" title="實驗性質。行為可能會在未來發生變動。"> <span class="visually-hidden">實驗性質</span> </abbr></li> </ul> <p>這些與<code>WebGLRenderingContext</code>有關的標識，皆引用在<a href="/en-US/docs/Web/API/WebGL_API" class="only-in-en-us" title="此頁面目前僅提供英文版本">WebGL</a></p></div></section><section aria-labelledby="教程指南"><h2 id="教程指南"><a href="#教程指南">教程指南</a></h2><div class="section-content"><dl> <dt id="canvas_tutorial"><a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial">Canvas tutorial</a></dt> <dd> <p>這個全部的課程包含 <code><canvas></code> 基礎的使用和高階的應用。</p> </dd> <dt id="code_snippets_canvas"><a href="/zh-TW/docs/Mozilla/Add-ons/Code_snippets/Canvas">Code snippets: Canvas</a></dt> <dd> <p>一些延伸的開發功能，包含<code><canvas></code>。</p> </dd> <dt id="demo_a_basic_ray-caster"><a class="page-not-created" title="此說明文件尚未被撰寫，期待你的貢獻！" data-href="/zh-TW/docs/Web/API/Canvas_API/A_basic_ray-caster">Demo: A basic ray-caster</a></dt> <dd> <p>使用<code><canvas></code>做的光線追蹤(ray-tracing )範例。</p> </dd> <dt id="drawing_dom_objects_into_a_canvas"><a class="page-not-created" title="此說明文件尚未被撰寫，期待你的貢獻！" data-href="/zh-TW/docs/Web/API/Canvas_API/Drawing_DOM_objects_into_a_canvas">Drawing DOM objects into a canvas</a></dt> <dd> <p>如何在 DOM<code><canvas></code>之中，畫個物件。例如 HTML 的元素。</p> </dd> <dt id="manipulating_video_using_canvas"><a href="/en-US/docs/Web/API/Canvas_API/Manipulating_video_using_canvas" class="only-in-en-us" title="此頁面目前僅提供英文版本">Manipulating video using canvas</a></dt> <dd> <p>結合<a class="only-in-en-us" title="此頁面目前僅提供英文版本" href="/en-US/docs/Web/HTML/Element/video"><code><video></code></a> 和 <a href="/zh-TW/docs/Web/HTML/Element/canvas"><code><canvas></code></a> 去控制影像資料的真實時間</p> </dd> </dl></div></section><section aria-labelledby="資源"><h2 id="資源"><a href="#資源">資源</a></h2><div class="section-content"></div></section><section aria-labelledby="generic"><h3 id="generic"><a href="#generic">Generic</a></h3><div class="section-content"><ul> <li><a href="https://joshondesign.com/p/books/canvasdeepdive/title.html" class="external" target="_blank">HTML5 Canvas Deep Dive</a></li> <li><a href="https://bucephalus.org/text/CanvasHandbook/CanvasHandbook.html" class="external" target="_blank">Canvas Handbook</a></li> </ul></div></section><section aria-labelledby="libraries"><h3 id="libraries"><a href="#libraries">Libraries</a></h3><div class="section-content"><ul> <li><a href="http://fabricjs.com" class="external" target="_blank">Fabric.js</a> is an open-source canvas library with SVG parsing capabilities.</li> <li><a href="https://github.com/ericdrowell/KineticJS" class="external" target="_blank">Kinetic.js</a> is an open-source canvas library focused on interactivity for desktop and mobile applications.</li> <li><a href="http://paperjs.org/" class="external" target="_blank">Paper.js</a> is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas.</li> <li><a href="http://origamijs.com/docs/" class="external" target="_blank">Origami.js</a> is an open source lightweight canvas library.</li> <li><a href="http://libcanvas.github.com/" class="external" target="_blank">libCanvas</a> 是一個強大且輕量化的 canvas 框架。</li> <li><a href="https://processingjs.org" class="external" target="_blank">Processing.js</a> 是視覺化程式語言 Processing 的移植版。</li> <li><a href="https://playcanvas.com/" class="external" target="_blank">PlayCanvas</a> is an open source game engine.</li> <li><a href="https://www.pixijs.com/" class="external" target="_blank">Pixi.js</a> is an open source game engine.</li> <li><a href="http://www.liquidx.net/plotkit/" class="external" target="_blank">PlotKit</a> 是一個製作圖表和圖形的函式庫。</li> <li><a href="https://github.com/jeremyckahn/rekapi" class="external" target="_blank">Rekapi</a> 是一個用來控制動畫影格的 Canvas API。</li> <li><a href="http://senchalabs.github.com/philogl/" class="external" target="_blank">PhiloGL</a> 是一個可應用在資料視覺化、遊戲開發的 WebGL 框架。</li> <li><a href="https://thejit.org/" class="external" target="_blank">JavaScript InfoVis Toolkit</a> 可在網頁上建立 2D 的互動式 Canvas 視覺化資料。</li> <li><a href="https://www.createjs.com/easeljs" class="external" target="_blank">EaselJS</a> 是一個自由 / 開放源始碼的函式庫，目的在簡化 canvas 於遊戲與美術的開發難度，類似 Flash API。</li> <li><a href="https://scrawl.rikweb.org.uk/" class="external" target="_blank">Scrawl-canvas</a> is another open-source javascript library for creating and manipulating 2d canvas elements</li> </ul></div></section><h2 id="規範"><a href="#規範">規範</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/canvas.html#the-canvas-element">HTML Standard <br/><small># 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Content available under <a href="/zh-TW/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-TW/docs/Web/API/Canvas_API","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"Canvas API","mdn_url":"/zh-TW/docs/Web/API/Canvas_API","locale":"zh-TW","native":"正體中文 (繁體)","browserCompat":["html.elements.canvas"],"baseline":{"baseline":"high","baseline_high_date":"2018-01-29","baseline_low_date":"2015-07-29","support":{"chrome":"1","chrome_android":"18","edge":"12","firefox":"1.5","firefox_android":"4","safari":"2","safari_ios":"1"}},"sidebarHTML":"<ol><li class=\"section\"><em><a href=\"/zh-TW/docs/Web/API/Canvas_API\" aria-current=\"page\">Canvas API</a></em></li><li class=\"toggle\"><details open=\"\"><summary>指南</summary><ol><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Manipulating_video_using_canvas\">Manipulating video using canvas</a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>教學</summary><ol><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial\">Canvas 教學文件</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Basic_usage\">Canvas 基本用途</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes\">繪製圖形</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Applying_styles_and_colors\">套用樣式與顏色</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Drawing_text\">使用canvas繪製文字</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Using_images\">使用影像</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Transformations\">變形效果</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Compositing\">合成效果</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Basic_animations\">基礎動畫</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Advanced_animations\">Advanced animations</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas\">Pixel manipulation with canvas</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Optimizing_canvas\">最佳化canvas</a></li><li><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial/Finale\">Finale</a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>介面</summary><ol><li><a href=\"/zh-TW/docs/Web/API/CanvasGradient\"><code>CanvasGradient</code></a></li><li><a href=\"/zh-TW/docs/Web/API/CanvasPattern\"><code>CanvasPattern</code></a></li><li><a href=\"/zh-TW/docs/Web/API/CanvasRenderingContext2D\"><code>CanvasRenderingContext2D</code></a></li><li><a href=\"/zh-TW/docs/Web/API/HTMLCanvasElement\"><code>HTMLCanvasElement</code></a></li><li><a href=\"/zh-TW/docs/Web/API/ImageBitmap\"><code>ImageBitmap</code></a></li><li><a href=\"/zh-TW/docs/Web/API/ImageBitmapRenderingContext\"><code>ImageBitmapRenderingContext</code></a></li><li><a href=\"/zh-TW/docs/Web/API/ImageData\"><code>ImageData</code></a></li><li><a href=\"/zh-TW/docs/Web/API/OffscreenCanvas\"><code>OffscreenCanvas</code></a></li><li><a href=\"/zh-TW/docs/Web/API/OffscreenCanvasRenderingContext2D\"><code>OffscreenCanvasRenderingContext2D</code></a></li><li><a href=\"/zh-TW/docs/Web/API/Path2D\"><code>Path2D</code></a></li><li><a href=\"/zh-TW/docs/Web/API/TextMetrics\"><code>TextMetrics</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>方法</summary><ol><li><a href=\"/zh-TW/docs/Web/API/Window/createImageBitmap\"><code>Window.createImageBitmap()</code></a></li><li><a href=\"/zh-TW/docs/Web/API/WorkerGlobalScope/createImageBitmap\"><code>WorkerGlobalScope.createImageBitmap()</code></a></li></ol></details></li></ol>","sidebarMacro":"DefaultAPISidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><strong><a href=\"/zh-TW/docs/Web/HTML/Element/canvas\"><code><canvas></code></a></strong> 是 <a href=\"/zh-TW/docs/Web/HTML\">HTML5</a> 的新元素，可透過 Script（通常是 <a href=\"/zh-TW/docs/Web/JavaScript\">JavaScript</a>）繪製圖形。例如，可以用來繪圖、合成圖照片、建立動畫、甚至處理即時的影片播放。</p>\n<p>Mozilla 應用程式從 Gecko 1.8（也就是 <a class=\"page-not-created\" title=\"此說明文件尚未被撰寫，期待你的貢獻！\" data-href=\"/zh-TW/Firefox_1.5_for_developers\">Firefox 1.5</a>）起開始支援 <code><canvas></code>。這個元素最初由蘋果 OS X <a href=\"https://www.apple.com/macosx/features/dashboard/\" class=\"external\" target=\"_blank\">Dashboard</a> 和 Safari 引入。Internet Explorer 9 以上版本也有支援 <code><canvas></code>，但較舊的 IE 版本則須嵌入 Google <a href=\"http://excanvas.sourceforge.net/\" class=\"external\" target=\"_blank\">Explorer Canvas</a> 專案中的程式腳本，才能得到有效的支援。Opera 9 也支援 <code><canvas></code>。</p>\n<p><code><canvas></code> 元素通常也被 <a href=\"/en-US/docs/Web/API/WebGL_API\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">WebGL</a> 用來在網頁上顯示使用硬體加速繪製的 3D 圖形。</p>"}},{"type":"prose","value":{"id":"範例","title":"範例","isH3":false,"content":"<p>這則簡單的範例使用了<a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/CanvasRenderingContext2D/fillRect\"><code>CanvasRenderingContext2D.fillRect()</code></a>這個方法。</p>"}},{"type":"prose","value":{"id":"html","title":"HTML","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">html</span></div><pre class=\"brush: html notranslate\"><code><canvas id=\"canvas\"></canvas>\n</code></pre></div>"}},{"type":"prose","value":{"id":"javascript","title":"JavaScript","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>var canvas = document.getElementById(\"canvas\");\nvar ctx = canvas.getContext(\"2d\");\n\nctx.fillStyle = \"green\";\nctx.fillRect(10, 10, 100, 100);\n</code></pre></div>\n<p>Edit the code below and see your changes update live in the canvas:</p>\n<div class=\"code-example\"><pre class=\"brush: html hidden notranslate\"><code><canvas id=\"canvas\" width=\"400\" height=\"200\" class=\"playable-canvas\"></canvas>\n<div class=\"playable-buttons\">\n <input id=\"edit\" type=\"button\" value=\"Edit\" />\n <input id=\"reset\" type=\"button\" value=\"Reset\" />\n</div>\n<textarea id=\"code\" class=\"playable-code\">\nctx.fillStyle = \"green\";\nctx.fillRect(10, 10, 100, 100);</textarea\n>\n</code></pre></div>\n<div class=\"code-example\"><pre class=\"brush: js hidden notranslate\"><code>var canvas = document.getElementById(\"canvas\");\nvar ctx = canvas.getContext(\"2d\");\nvar textarea = document.getElementById(\"code\");\nvar reset = document.getElementById(\"reset\");\nvar edit = document.getElementById(\"edit\");\nvar code = textarea.value;\n\nfunction drawCanvas() {\n ctx.clearRect(0, 0, canvas.width, canvas.height);\n eval(textarea.value);\n}\n\nreset.addEventListener(\"click\", function () {\n textarea.value = code;\n drawCanvas();\n});\n\nedit.addEventListener(\"click\", function () {\n textarea.focus();\n});\n\ntextarea.addEventListener(\"input\", drawCanvas);\nwindow.addEventListener(\"load\", drawCanvas);\n</code></pre></div><div class=\"code-example\"><div class=\"example-header\"></div><iframe class=\"sample-code-frame\" title=\"範例 sample\" id=\"frame_範例\" width=\"700\" height=\"360\" src=\"about:blank\" data-live-path=\"/zh-TW/docs/Web/API/Canvas_API\" data-live-id=\"範例\" sandbox=\"allow-same-origin allow-scripts\" loading=\"lazy\"></iframe></div>"}},{"type":"prose","value":{"id":"參考","title":"參考","isH3":false,"content":"<ul>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/HTMLCanvasElement\"><code>HTMLCanvasElement</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/CanvasRenderingContext2D\"><code>CanvasRenderingContext2D</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/CanvasGradient\"><code>CanvasGradient</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/CanvasPattern\"><code>CanvasPattern</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/ImageBitmap\"><code>ImageBitmap</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/ImageData\"><code>ImageData</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/TextMetrics\"><code>TextMetrics</code></a></li>\n <li><a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/API/Path2D\"><code>Path2D</code></a> <abbr class=\"icon icon-experimental\" title=\"實驗性質。行為可能會在未來發生變動。\">\n <span class=\"visually-hidden\">實驗性質</span>\n</abbr></li>\n</ul>\n<p>這些與<code>WebGLRenderingContext</code>有關的標識，皆引用在<a href=\"/en-US/docs/Web/API/WebGL_API\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">WebGL</a></p>"}},{"type":"prose","value":{"id":"教程指南","title":"教程指南","isH3":false,"content":"<dl>\n <dt id=\"canvas_tutorial\"><a href=\"/zh-TW/docs/Web/API/Canvas_API/Tutorial\">Canvas tutorial</a></dt>\n <dd>\n <p>這個全部的課程包含 <code><canvas></code> 基礎的使用和高階的應用。</p>\n </dd>\n <dt id=\"code_snippets_canvas\"><a href=\"/zh-TW/docs/Mozilla/Add-ons/Code_snippets/Canvas\">Code snippets: Canvas</a></dt>\n <dd>\n <p>一些延伸的開發功能，包含<code><canvas></code>。</p>\n </dd>\n <dt id=\"demo_a_basic_ray-caster\"><a class=\"page-not-created\" title=\"此說明文件尚未被撰寫，期待你的貢獻！\" data-href=\"/zh-TW/docs/Web/API/Canvas_API/A_basic_ray-caster\">Demo: A basic ray-caster</a></dt>\n <dd>\n <p>使用<code><canvas></code>做的光線追蹤(ray-tracing )範例。</p>\n </dd>\n <dt id=\"drawing_dom_objects_into_a_canvas\"><a class=\"page-not-created\" title=\"此說明文件尚未被撰寫，期待你的貢獻！\" data-href=\"/zh-TW/docs/Web/API/Canvas_API/Drawing_DOM_objects_into_a_canvas\">Drawing DOM objects into a canvas</a></dt>\n <dd>\n <p>如何在 DOM<code><canvas></code>之中，畫個物件。例如 HTML 的元素。</p>\n </dd>\n <dt id=\"manipulating_video_using_canvas\"><a href=\"/en-US/docs/Web/API/Canvas_API/Manipulating_video_using_canvas\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">Manipulating video using canvas</a></dt>\n <dd>\n <p>結合<a class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\" href=\"/en-US/docs/Web/HTML/Element/video\"><code><video></code></a> 和 <a href=\"/zh-TW/docs/Web/HTML/Element/canvas\"><code><canvas></code></a> 去控制影像資料的真實時間</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"資源","title":"資源","isH3":false,"content":""}},{"type":"prose","value":{"id":"generic","title":"Generic","isH3":true,"content":"<ul>\n <li><a href=\"https://joshondesign.com/p/books/canvasdeepdive/title.html\" class=\"external\" target=\"_blank\">HTML5 Canvas Deep Dive</a></li>\n <li><a href=\"https://bucephalus.org/text/CanvasHandbook/CanvasHandbook.html\" class=\"external\" target=\"_blank\">Canvas Handbook</a></li>\n</ul>"}},{"type":"prose","value":{"id":"libraries","title":"Libraries","isH3":true,"content":"<ul>\n <li><a href=\"http://fabricjs.com\" class=\"external\" target=\"_blank\">Fabric.js</a> is an open-source canvas library with SVG parsing capabilities.</li>\n <li><a href=\"https://github.com/ericdrowell/KineticJS\" class=\"external\" target=\"_blank\">Kinetic.js</a> is an open-source canvas library focused on interactivity for desktop and mobile applications.</li>\n <li><a href=\"http://paperjs.org/\" class=\"external\" target=\"_blank\">Paper.js</a> is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas.</li>\n <li><a href=\"http://origamijs.com/docs/\" class=\"external\" target=\"_blank\">Origami.js</a> is an open source lightweight canvas library.</li>\n <li><a href=\"http://libcanvas.github.com/\" class=\"external\" target=\"_blank\">libCanvas</a> 是一個強大且輕量化的 canvas 框架。</li>\n <li><a href=\"https://processingjs.org\" class=\"external\" target=\"_blank\">Processing.js</a> 是視覺化程式語言 Processing 的移植版。</li>\n <li><a href=\"https://playcanvas.com/\" class=\"external\" target=\"_blank\">PlayCanvas</a> is an open source game engine.</li>\n <li><a href=\"https://www.pixijs.com/\" class=\"external\" target=\"_blank\">Pixi.js</a> is an open source game engine.</li>\n <li><a href=\"http://www.liquidx.net/plotkit/\" class=\"external\" target=\"_blank\">PlotKit</a> 是一個製作圖表和圖形的函式庫。</li>\n <li><a href=\"https://github.com/jeremyckahn/rekapi\" class=\"external\" target=\"_blank\">Rekapi</a> 是一個用來控制動畫影格的 Canvas API。</li>\n <li><a href=\"http://senchalabs.github.com/philogl/\" class=\"external\" target=\"_blank\">PhiloGL</a> 是一個可應用在資料視覺化、遊戲開發的 WebGL 框架。</li>\n <li><a href=\"https://thejit.org/\" class=\"external\" target=\"_blank\">JavaScript InfoVis Toolkit</a> 可在網頁上建立 2D 的互動式 Canvas 視覺化資料。</li>\n <li><a href=\"https://www.createjs.com/easeljs\" class=\"external\" target=\"_blank\">EaselJS</a> 是一個自由 / 開放源始碼的函式庫，目的在簡化 canvas 於遊戲與美術的開發難度，類似 Flash API。</li>\n <li><a href=\"https://scrawl.rikweb.org.uk/\" class=\"external\" target=\"_blank\">Scrawl-canvas</a> is another open-source javascript library for creating and manipulating 2d canvas elements</li>\n</ul>"}},{"type":"specifications","value":{"title":"規範","id":"規範","isH3":false,"specifications":[{"bcdSpecificationURL":"https://html.spec.whatwg.org/multipage/canvas.html#the-canvas-element","title":"HTML Standard"}],"query":"html.elements.canvas"}},{"type":"prose","value":{"id":"參見","title":"參見","isH3":false,"content":"<ul>\n <li><a href=\"/en-US/docs/Web/API/WebGL_API\" class=\"only-in-en-us\" title=\"此頁面目前僅提供英文版本\">WebGL</a></li>\n</ul>"}}],"toc":[{"text":"範例","id":"範例"},{"text":"參考","id":"參考"},{"text":"教程指南","id":"教程指南"},{"text":"資源","id":"資源"},{"text":"規範","id":"規範"},{"text":"參見","id":"參見"}],"summary":"<canvas> 是 HTML5 的新元素，可透過 Script（通常是 JavaScript）繪製圖形。例如，可以用來繪圖、合成圖照片、建立動畫、甚至處理即時的影片播放。","popularity":0,"modified":"2023-06-03T02:12:11.000Z","other_translations":[{"locale":"de","title":"Canvas API","native":"Deutsch"},{"locale":"en-US","title":"Canvas API","native":"English (US)"},{"locale":"es","title":"API Canvas","native":"Español"},{"locale":"fr","title":"API canvas","native":"Français"},{"locale":"ja","title":"キャンバス API","native":"日本語"},{"locale":"ko","title":"Canvas API","native":"한국어"},{"locale":"pt-BR","title":"Canvas","native":"Português (do Brasil)"},{"locale":"ru","title":"Canvas","native":"Русский"},{"locale":"zh-CN","title":"Canvas API","native":"中文 (简体)"}],"pageType":"unknown","source":{"folder":"zh-tw/web/api/canvas_api","github_url":"https://github.com/mdn/translated-content/blob/main/files/zh-tw/web/api/canvas_api/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/d8c2a2e07d642ea5d24b662054e78aa79c4d3b85","filename":"index.md"},"short_title":"Canvas API","parents":[{"uri":"/zh-TW/docs/Web","title":"給開發者的網頁技術文件"},{"uri":"/zh-TW/docs/Web/API","title":"Web APIs"},{"uri":"/zh-TW/docs/Web/API/Canvas_API","title":"Canvas API"}],"pageTitle":"Canvas API - Web APIs | MDN","noIndexing":false}}</script></body></html>