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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>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本サポート</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>機能</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>基本サポート</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="注記">注記</h3>
+
+<ul>
+ <li>[1] この機能はフラグを変更しないと動作しません。有効にするには<code>ExperimentalCanvasFeatures</code>フラグを<code>true</code>に設定してください。</li>
+ <li>[2] この機能は設定を変更しないと動作しません。about:configで<code>canvas.hitregions.enabled</code>を<code>true</code>に設定してください。</li>
+</ul>
+
+<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>