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+---
+title: CanvasRenderingContext2D.imageSmoothingEnabled
+slug: Web/API/CanvasRenderingContext2D/imageSmoothingEnabled
+tags:
+  - Canvas
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/imageSmoothingEnabled
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.imageSmoothingEnabled</code></strong> 是 Canvas 2D API 用来设置图片是否平滑的属性，true表示图片平滑（默认值），false表示图片不平滑。当我们获取 <code>imageSmoothingEnabled</code> 属性值时， 它会返回最新设置的值。</p>
+
+<p> 以缩放画布为例，这个属性对像素为主的游戏很有用。默认的改变大小的算法会造成图片模糊并且破坏图片原有的像素。 如果那样的话，设置属性值为false。 参见 CSS {{cssxref("image-rendering")}} 属性。</p>
+
+<div class="blockIndicator note">
+<p><strong>注意:</strong>您可以使用{{domxref("CanvasRenderingContext2D.imageSmoothingQuality", "imageSmoothingQuality")}}属性来调整平滑质量。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.imageSmoothingEnabled = value;</var></pre>
+
+<h3 id="选项">选项</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>一个{{jsxref("Boolean")}} 类型的值，表示图片是否平滑。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Using_the_globalAlpha_property" name="Using_the_globalAlpha_property">使用 <code>imageSmoothingEnabled</code> 属性</h3>
+
+<p>本示例比较了三个图像。 第一个图像以其自然大小绘制，第二个图像缩放为3倍并启用了图像平滑，而第三个图像缩放为3倍但禁用了图像平滑。</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="460" height="210"&gt;&lt;/canvas&gt;</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js">const canvas = document.getElementById('canvas');
+
+const ctx = canvas.getContext('2d');
+ctx.font = '16px sans-serif';
+ctx.textAlign = 'center';
+
+const img = new Image();
+img.src = 'https://interactive-examples.mdn.mozilla.net/media/examples/star.png';
+img.onload = function() {
+  const w = img.width,
+        h = img.height;
+
+  ctx.fillText('Source', w * .5, 20);
+  ctx.drawImage(img, 0, 24, w, h);
+
+  ctx.fillText('Smoothing = TRUE', w * 2.5, 20);
+<code>  ctx.imageSmoothingEnabled = true;</code>
+  ctx.drawImage(img, w, 24, w * 3, h * 3);
+
+  ctx.fillText('Smoothing = FALSE', w * 5.5, 20);
+<code>  ctx.imageSmoothingEnabled = false;</code>
+  ctx.drawImage(img, w * 4, 24, w * 3, h * 3);
+};
+</pre>
+
+<div class="hidden">
+<h2 id="Disabling_image_smoothing">Disabling_image_smoothing</h2>
+
+<h3 id="HTML_2">HTML</h3>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="460" height="210"&gt;&lt;/canvas&gt;</pre>
+
+
+
+<h3 id="JavaScript_2">JavaScript</h3>
+
+<pre class="brush: js">const canvas = document.getElementById('canvas');
+
+const ctx = canvas.getContext('2d');
+ctx.font = '16px sans-serif';
+ctx.textAlign = 'center';
+
+const img = new Image();
+img.src = 'https://interactive-examples.mdn.mozilla.net/media/examples/star.png';
+img.onload = function() {
+  const w = img.width,
+        h = img.height;
+
+  ctx.fillText('Source', w * .5, 20);
+  ctx.drawImage(img, 0, 24, w, h);
+
+  ctx.fillText('Smoothing = TRUE', w * 2.5, 20);
+<code>  ctx.imageSmoothingEnabled = true;</code>
+  ctx.drawImage(img, w, 24, w * 3, h * 3);
+
+  ctx.fillText('Smoothing = FALSE', w * 5.5, 20);
+<code>  ctx.imageSmoothingEnabled = false;</code>
+  ctx.drawImage(img, w * 4, 24, w * 3, h * 3);
+};
+</pre>
+
+
+</div>
+
+<h4 id="结果">结果</h4>
+
+<p>{{ EmbedLiveSample('Disabling_image_smoothing', 700, 240) }}</p>
+
+<h2 id="规范描述">规范描述</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-imagesmoothingenabled", "CanvasRenderingContext2D.imageSmoothingEnabled")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">
+<p>此页面上的兼容性表是根据结构化数据生成的。 如果您想提供数据，请查看<a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a>并向我们发送拉取请求。</p>
+</div>
+
+<p>{{Compat("api.CanvasRenderingContext2D.imageSmoothingEnabled")}}</p>
+
+<div id="compat-mobile"></div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{cssxref("image-rendering")}}</li>
+</ul>