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+---
+title: HTMLCanvasElement
+slug: Web/API/HTMLCanvasElement
+tags:
+  - API
+  - Canvas
+  - HTML DOM
+  - Interface
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+translation_of: Web/API/HTMLCanvasElement
+---
+<div>
+<div>{{APIRef("Canvas API")}}</div>
+</div>
+
+<p><strong><code><span>HTMLCanvasElement</span></code></strong> 介面提供控制 canvas 元素的屬性和方法. <code>HTMLCanvasElement</code> 介面也繼承了 {{domxref("HTMLElement")}} 介面的屬性和方法.</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<h2 id="屬性">屬性</h2>
+
+<p><em>從父代繼承的屬性，</em><em>{{domxref("HTMLElement")}}.</em></p>
+
+<dl>
+ <dt>{{domxref("HTMLCanvasElement.height")}}</dt>
+ <dd>Is a positive <code>integer</code> reflecting the {{htmlattrxref("height", "canvas")}} HTML attribute of the {{HTMLElement("canvas")}} element interpreted in CSS pixels. When the attribute is not specified, or if it is set to an invalid value, like a negative, the default value of <code>150</code> is used.</dd>
+ <dt>{{domxref("HTMLCanvasElement.mozOpaque")}} {{non-standard_inline}}</dt>
+ <dd>Is a {{jsxref("Boolean")}} reflecting the {{htmlattrxref("moz-opaque", "canvas")}} HTML attribute of the {{HTMLElement("canvas")}} element. It lets the canvas know whether or not translucency will be a factor. If the canvas knows there's no translucency, painting performance can be optimized.</dd>
+ <dt>{{domxref("HTMLCanvasElement.width")}}</dt>
+ <dd>Is a positive <code>integer</code> reflecting the {{htmlattrxref("width", "canvas")}} HTML attribute of the {{HTMLElement("canvas")}} element interpreted in CSS pixels. When the attribute is not specified, or if it is set to an invalid value, like a negative, the default value of <code>300</code> is used.</dd>
+ <dt>{{domxref("HTMLCanvasElement.mozPrintCallback")}}{{non-standard_inline}}</dt>
+ <dd>Is a <code>function</code> that is Initially null, Web content can set this to a JavaScript function that will be called if the page is printed. This function can then redraw the canvas at a higher resolution that is suitable for the printer being used. <a href="https://blog.mozilla.org/labs/2012/09/a-new-way-to-control-printing-output/">See this blog post.</a></dd>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<p><em>從父代繼承的方法, </em><em>{{domxref("HTMLElement")}}.</em></p>
+
+<dl>
+ <dt>{{domxref("HTMLCanvasElement.captureStream()")}} {{experimental_inline}}</dt>
+ <dd>Returns a {{domxref("CanvasCaptureMediaStream")}} that is a real-time video capture of the surface of the canvas.</dd>
+ <dt>{{domxref("HTMLCanvasElement.getContext()")}}</dt>
+ <dd>Returns a drawing context on the canvas, or null if the context ID is not supported. A drawing context lets you draw on the canvas. Calling getContext with <code>"2d"</code> returns a {{domxref("CanvasRenderingContext2D")}} object, whereas calling it with <code>"experimental-webgl"</code> (or <code>"webgl"</code>) returns a {{domxref("WebGLRenderingContext")}} object. This context is only available on browsers that implement <a href="/en-US/docs/Web/WebGL">WebGL</a>.</dd>
+ <dt>{{domxref("HTMLCanvasElement.toDataURL()")}}</dt>
+ <dd>Returns a data-URL containing a representation of the image in the format specified by the <code>type</code> parameter (defaults to <code>png</code>). The returned image is in a resolution of 96dpi.</dd>
+ <dt>{{domxref("HTMLCanvasElement.toBlob()")}}</dt>
+ <dd>Creates a {{domxref("Blob")}} object representing the image contained in the canvas; this file may be cached on the disk or stored in memory at the discretion of the user agent.</dd>
+ <dt>{{domxref("HTMLCanvasElement.mozGetAsFile()")}} {{non-standard_inline}} {{deprecated_inline}}</dt>
+ <dd>Returns a {{domxref("File")}} object representing the image contained in the canvas; this file is a memory-based file, with the specified <code>name</code>. If <code>type</code> is not specified, the image type is <code>image/png</code>.</dd>
+</dl>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">狀態</th>
+   <th scope="col">註</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Media Capture DOM Elements', '#html-media-element-media-capture-extensions', 'HTMLCanvasElement')}}</td>
+   <td>{{Spec2('Media Capture DOM Elements')}}</td>
+   <td>Adds the method <code>captureStream()</code>.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "#the-canvas-element", "HTMLCanvasElement")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>The method <code>getContext()</code> now returns a {{domxref("RenderingContext")}} rather than an opaque <code>object</code>.<br>
+    The methods <code>probablySupportsContext()</code>, <code>setContext()</code> and <code>transferControlToProxy()</code>have been added.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5.1', "scripting-1.html#the-canvas-element", "HTMLCanvasElement")}}</td>
+   <td>{{Spec2('HTML5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', "scripting-1.html#the-canvas-element", "HTMLCanvasElement")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support (<code>2D</code> context)</td>
+   <td>4.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop('1.9.2')}}</td>
+   <td>9.0</td>
+   <td>9.0 [1]</td>
+   <td>3.1</td>
+  </tr>
+  <tr>
+   <td><code>toBlob()</code></td>
+   <td>50</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop('19')}} [2]</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}} (bug <a href="https://bugs.webkit.org/show_bug.cgi?id=71270">71270</a>)</td>
+  </tr>
+  <tr>
+   <td><code>probablySupportsContext()</code>,<br>
+    <code>setContext()</code>,<br>
+    <code>transferControlToProxy()</code> {{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>mozGetAsFile()</code> {{non-standard_inline}} {{deprecated_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop('2')}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>captureStream()</code> {{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop('41')}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>transferControlToOffscreen()</code> {{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop(44)}} [3]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support (<code>2D</code> context)</td>
+   <td>2.1</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>10.0 [1]</td>
+   <td>3.2</td>
+  </tr>
+  <tr>
+   <td><code>webgl</code> context</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}} as <code>experimental-webgl</code></td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td><code>toBlob()</code></td>
+   <td>{{CompatNo}} (bug <a href="http://crbug.com/67587">67587</a>)</td>
+   <td>50</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile('18')}} [2]</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}} (bug <a href="https://bugs.webkit.org/show_bug.cgi?id=71270">71270</a>)</td>
+  </tr>
+  <tr>
+   <td><code>probablySupportsContext()</code>,<br>
+    <code>setContext()</code>,<br>
+    <code>transferControlToProxy() </code>{{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>mozGetAsFile()</code> {{non-standard_inline}} {{deprecated_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile('2')}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>captureStream() </code>{{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile('41')}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>transferControlToOffscreen()</code> {{experimental_inline}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile(44)}} [3]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Opera Mini 5.0 and later has partial support.</p>
+
+<p>[2] Support for the third parameter, has been added in Gecko 25 only: when used with the <code>"image/jpeg"</code> type, this argument specifies the image quality.</p>
+
+<p>[3] This feature is behind a feature preference setting. In about:config, set <code>gfx.offscreencanvas.enabled</code> to <code>true</code>.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>HTML element implementing this interface: {{HTMLElement("canvas")}}.</li>
+</ul>
diff --git a/files/zh-tw/web/api/htmlcanvaselement/todataurl/index.html b/files/zh-tw/web/api/htmlcanvaselement/todataurl/index.html
new file mode 100644
index 0000000000..7a87309580
--- /dev/null
+++ b/files/zh-tw/web/api/htmlcanvaselement/todataurl/index.html
@@ -0,0 +1,201 @@
+---
+title: HTMLCanvasElement.toDataURL()
+slug: Web/API/HTMLCanvasElement/toDataURL
+tags:
+  - API
+  - Canvas
+translation_of: Web/API/HTMLCanvasElement/toDataURL
+---
+<div>
+<div>
+<div>{{APIRef("Canvas API")}}</div>
+</div>
+</div>
+
+<p><strong><code>HTMLCanvasElement.toDataURL()</code></strong> 方法回傳含有圖像和參數設置特定格式的 <a href="/en-US/docs/Web/HTTP/data_URIs">data URIs</a> (預設 <a href="https://en.wikipedia.org/wiki/Portable_Network_Graphics">PNG</a>). 回傳的圖像解析度為 96 dpi.</p>
+
+<ul>
+ <li>如果 canvas 的高度或是寬度為 <code>0</code>, 將會回傳字串 <code>"data:,"</code>.</li>
+ <li>如果要求的圖像類型並非 <code>image/png</code>, 但是回傳的類型卻是 <code>data:image/png</code>, 表示要求的圖像類型並不支援.</li>
+ <li>Chrome 也支援 <code>image/webp</code> 類型.</li>
+</ul>
+
+<h2 id="Syntax" name="Syntax">表達式</h2>
+
+<pre class="syntaxbox"><var><em>canvas</em>.toDataURL(<em>type</em>, <em>encoderOptions</em>);</var>
+</pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>type</code> {{optional_inline}}</dt>
+ <dd>圖像格式的 {{domxref("DOMString")}}. 預設為 <code>image/png</code>.</dd>
+ <dt><code>encoderOptions</code> {{optional_inline}}</dt>
+ <dd><code>表示 image/jpeg 或是 image/webp 的圖像品質, 為0</code> 到 <code>1</code> 之間的 {{jsxref("Number")}}.<br>
+ 如果值不在上述範圍中, 將會使用預設值. 其他的會忽略.</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>包含 <a href="/en-US/docs/Web/HTTP/data_URIs">data URI</a> 的 {{domxref("DOMString")}}.</p>
+
+<h2 id="範例">範例</h2>
+
+<p>創建 {{HTMLElement("canvas")}} 元素:</p>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="5" height="5"&gt;&lt;/canvas&gt;
+</pre>
+
+<p>可以使用下面的方式獲取 data-URL:</p>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var dataURL = canvas.toDataURL();
+console.log(dataURL);
+// "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNby
+// blAAAADElEQVQImWNgoBMAAABpAAFEI8ARAAAAAElFTkSuQmCC"
+</pre>
+
+<h3 id="設置圖像的品質">設置圖像的品質</h3>
+
+<pre class="brush: js">var fullQuality = canvas.toDataURL("image/jpeg", 1.0);
+// data:image/jpeg;base64,/9j/4AAQSkZJRgABAQ...9oADAMBAAIRAxEAPwD/AD/6AP/Z"
+var mediumQuality = canvas.toDataURL("image/jpeg", 0.5);
+var lowQuality = canvas.toDataURL("image/jpeg", 0.1);
+</pre>
+
+<h3 id="Example:_Dynamically_change_images" name="Example:_Dynamically_change_images">範例: 動態改變圖像</h3>
+
+<p>為了動態改變圖像, 可以與滑鼠事件一起使用 (gray-scale versus color in this example):</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;img class="grayscale" src="myPicture.png" alt="Description of my picture" /&gt;</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js;highlight:[33]">window.addEventListener("load", removeColors);
+
+function showColorImg() {
+  this.style.display = "none";
+  this.nextSibling.style.display = "inline";
+}
+
+function showGrayImg() {
+  this.previousSibling.style.display = "inline";
+  this.style.display = "none";
+}
+
+function removeColors() {
+  var aImages = document.getElementsByClassName("grayscale"),
+      nImgsLen = aImages.length,
+      oCanvas = document.createElement("canvas"),
+      oCtx = oCanvas.getContext("2d");
+  for (var nWidth, nHeight, oImgData, oGrayImg, nPixel, aPix, nPixLen, nImgId = 0; nImgId &lt; nImgsLen; nImgId++) {
+    oColorImg = aImages[nImgId];
+    nWidth = oColorImg.offsetWidth;
+    nHeight = oColorImg.offsetHeight;
+    oCanvas.width = nWidth;
+    oCanvas.height = nHeight;
+    oCtx.drawImage(oColorImg, 0, 0);
+    oImgData = oCtx.getImageData(0, 0, nWidth, nHeight);
+    aPix = oImgData.data;
+    nPixLen = aPix.length;
+    for (nPixel = 0; nPixel &lt; nPixLen; nPixel += 4) {
+      aPix[nPixel + 2] = aPix[nPixel + 1] = aPix[nPixel] = (aPix[nPixel] + aPix[nPixel + 1] + aPix[nPixel + 2]) / 3;
+    }
+    oCtx.putImageData(oImgData, 0, 0);
+    oGrayImg = new Image();
+    oGrayImg.src = oCanvas.toDataURL();
+    oGrayImg.onmouseover = showColorImg;
+    oColorImg.onmouseout = showGrayImg;
+    oCtx.clearRect(0, 0, nWidth, nHeight);
+    oColorImg.style.display = "none";
+    oColorImg.parentNode.insertBefore(oGrayImg, oColorImg);
+  }
+}</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">狀態</th>
+   <th scope="col">註</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "scripting.html#dom-canvas-todataurl", "HTMLCanvasElement.toDataURL")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change since the latest snapshot, {{SpecName('HTML5 W3C')}}</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5.1', "scripting-1.html#dom-canvas-todataurl", "HTMLCanvasElement.toDataURL")}}</td>
+   <td>{{Spec2('HTML5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', "scripting-1.html#dom-canvas-todataurl", "HTMLCanvasElement.toDataURL")}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Snapshot of the {{SpecName('HTML WHATWG')}} containing the initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{ CompatChrome(4) }}</td>
+   <td>{{ CompatGeckoDesktop("1.9.2") }}</td>
+   <td>{{ CompatIE(9) }}</td>
+   <td>{{ CompatOpera(9) }}</td>
+   <td>{{ CompatSafari(4.0) }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{ CompatAndroid(3.2) }}</td>
+   <td>{{ CompatAndroid(18) }}</td>
+   <td>{{ CompatGeckoMobile("1.9.2") }}</td>
+   <td>{{ CompatVersionUnknown() }}</td>
+   <td>{{ CompatOpera(19) }}</td>
+   <td><span style="font-size: 12px; line-height: 18px;">{{ CompatSafari(3.0) }}</span></td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_Also" name="See_Also">參見</h2>
+
+<ul>
+ <li>The interface defining it, {{domxref("HTMLCanvasElement")}}.</li>
+ <li><a href="/en-US/docs/Web/HTTP/data_URIs">Data URIs</a> in the <a href="/en-US/docs/Web/HTTP">HTTP</a> reference.</li>
+</ul>