---
title: CanvasRenderingContext2D.clearHitRegions()
slug: Web/API/CanvasRenderingContext2D/clearHitRegions
translation_of: Web/API/CanvasRenderingContext2D/clearHitRegions
---
<div>{{APIRef}} {{obsolete_header}}</div>

<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.clearHitRegions()</code></strong> 是 Canvas 2D API 在画布中删除所有点击区域的方法。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">void <var><em>ctx</em>.clearHitRegions();</var>
</pre>

<h2 id="示例">示例</h2>

<h3 id="使用_clearHitRegions_方法">使用 <code>clearHitRegions</code> 方法</h3>

<p>这仅是一段简单的使用 <code>clearHitRegions</code> 方法的代码片段。</p>

<h4 id="HTML">HTML</h4>

<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
</pre>

<h4 id="JavaScript">JavaScript</h4>

<pre class="brush: js; highlight:[10]">var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

// set some hit regions
ctx.addHitRegion({id: "eyes"});
ctx.addHitRegion({id: "nose"});
ctx.addHitRegion({id: "mouth"});

// remove them altogether from the canvas
ctx.clearHitRegions();
</pre>

<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-clearhitregions", "CanvasRenderingContext2D.clearHitRegions")}}</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>

<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>{{CompatVersionUnknown}}[1]</td>
   <td>{{CompatGeckoDesktop(38)}} [2]</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>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{ CompatNo }}</td>
   <td>{{ CompatNo }}</td>
   <td>{{CompatGeckoMobile(38)}} [2]</td>
   <td>{{ CompatNo }}</td>
   <td>{{ CompatNo }}</td>
   <td>{{ CompatNo }}</td>
  </tr>
 </tbody>
</table>
</div>

<h3 id="兼容性注解">兼容性注解</h3>

<ul>
 <li>[1] 此特性需要一个特性标志。 设置 <code>ExperimentalCanvasFeatures</code> 标志为 <code>true</code> 进行启用。</li>
 <li>[2] 此特性需要一个特性偏好设置。 在 about:config中设置 <code>canvas.hitregions.enabled</code> 为 true。</li>
</ul>

<h2 id="参见">参见</h2>

<ul>
 <li>{{domxref("CanvasRenderingContext2D.addHitRegion()")}} {{experimental_inline}}</li>
 <li>{{domxref("CanvasRenderingContext2D.removeHitRegion()")}} {{experimental_inline}}</li>
</ul>