files/ja/web/api/canvasrenderingcontext2d/clearhitregions/index.html


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

<p>Canvas 2D APIの<code><strong>CanvasRenderingContext2D</strong></code><strong><code>.clearHitRegions()</code></strong>メソッドはcanvasからすべてのヒット領域を削除します。</p>

<h2 id="構文">構文</h2>

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

<h2 id="例">例</h2>

<h3 id="clearHitRegionsメソッドを使う"><code>clearHitRegions</code>メソッドを使う</h3>

<p>これは、<code>clearHitRegions</code>メソッドを使った簡単なコードです。</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");

// ヒット領域をいくつか指定
ctx.addHitRegion({id: "eyes"});
ctx.addHitRegion({id: "nose"});
ctx.addHitRegion({id: "mouth"});

// canvasからすべて削除
ctx.clearHitRegions();
</pre>

<h2 id="仕様">仕様</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">仕様</th>
   <th scope="col">策定状況</th>
   <th scope="col">コメント</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="ブラウザー実装状況">ブラウザー実装状況</h2>

<p>{{Compat("api.CanvasRenderingContext2D.clearHitRegions")}}</p>

<h2 id="関連情報">関連情報</h2>

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