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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: performance.clearMeasures()
+slug: Web/API/Performance/clearMeasures
+tags:
+ - API
+ - Web パフォーマンス
+ - メソッド
+ - リファレンス
+translation_of: Web/API/Performance/clearMeasures
+---
+<div>{{APIRef("User Timing API")}}</div>
+
+<p><strong><code>clearMeasures()</code></strong> メソッドは、ブラウザのパフォーマンスエントリバッファから<em>名前付きメジャー</em>を削除します。<br>
+ メソッドが引数なしで呼び出された場合、エントリタイプが  "measure" の{{domxref("PerformanceEntry","パフォーマンスエントリ")}} はすべてパフォーマンスエントリバッファから削除されます。</p>
+
+<p>{{AvailableInWorkers}}</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox"><em>performance</em>.clearMeasures();
+<em>performance</em>.clearMeasures(name);
+</pre>
+
+<h3 id="引数">引数</h3>
+
+<dl>
+ <dt>name {{optional_inline}}</dt>
+ <dd>タイムスタンプの名前を表す {{domxref("DOMString")}}。この引数を省略すると、{{domxref("PerformanceEntry.entryType","エントリタイプ")}}が  "<code>measure</code>" の{{domxref("PerformanceEntry","パフォーマンスエントリ")}}がすべて削除されます。</dd>
+</dl>
+
+<h3 id="戻り値">戻り値</h3>
+
+<dl>
+ <dt>void</dt>
+</dl>
+
+<h2 id="例">例</h2>
+
+<p>次の例は、<code>clearMeasures()</code> メソッドの両方の使用方法を示しています。</p>
+
+<pre class="brush: js">// Create a small helper to show how many PerformanceMeasure entries there are.
+function logMeasureCount() {
+ console.log(
+ "Found this many entries: " + performance.getEntriesByType("measure").length
+ );
+}
+
+// Create a bunch of measures.
+performance.measure("from navigation");
+performance.mark("a");
+performance.measure("from mark a", "a");
+performance.measure("from navigation");
+performance.measure("from mark a", "a");
+performance.mark("b");
+performance.measure("between a and b", "a", "b");
+
+logMeasureCount() // "Found this many entries: 5"
+
+// Delete just the "from navigation" PerformanceMeasure entries.
+performance.clearMeasures("from navigation");
+logMeasureCount() // "Found this many entries: 3"
+
+// Delete all of the PerformanceMeasure entries.
+performance.clearMeasures();
+logMeasureCount() // "Found this many entries: 0"
+</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様書</th>
+ <th scope="col">ステータス</th>
+ <th scope="col">コメント</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('User Timing Level 2', '#dom-performance-clearmeasures', 'clearMeasures()')}}</td>
+ <td>{{Spec2('User Timing Level 2')}}</td>
+ <td><code>clearMeasures()</code> を明確にします。</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('User Timing', '#dom-performance-clearmeasures', 'clearMeasures()')}}</td>
+ <td>{{Spec2('User Timing')}}</td>
+ <td>基本的な定義</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザの互換性">ブラウザの互換性</h2>
+
+<div>
+<div class="hidden">このページの互換性テーブルは構造化データから生成されます。データに貢献したい場合は <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックして、プルリクエストを送ってください。</div>
+
+<p>{{Compat("api.Performance.clearMeasures")}}</p>
+</div>