--- title: Performance.clearMeasures() slug: Web/API/Performance/clearMeasures translation_of: Web/API/Performance/clearMeasures --- <div>{{APIRef("User Timing API")}}</div> <p><strong><code>clearMeasures()</code></strong> 方法可以从浏览器的性能入口缓存区中移除声明的度量衡。如果这个方法被调用时没有传入参数,则所有 {{domxref("PerformanceEntry.entryType","entry type")}} 标记值为"<code>measure</code>" 的{{domxref("PerformanceEntry","性能实体")}}将被从性能入口缓存区中移除。</p> <p>{{AvailableInWorkers}}</p> <h2 id="用法">用法</h2> <pre class="syntaxbox"><em>performance</em>.clearMeasures(); <em>performance</em>.clearMeasures(name); </pre> <h3 id="参数">参数</h3> <dl> <dt>name {{optional_inline}}</dt> <dd>用于表述时间戳名称的 {{domxref("DOMString")}}。如果没有提供这个参数,则所有 {{domxref("PerformanceEntry.entryType","entry type")}} 标记值为"<code>measure</code>" 的{{domxref("PerformanceEntry","性能实体")}}将被移除。</dd> </dl> <h3 id="返回值">返回值</h3> <dl> <dt>void</dt> <dd> </dd> </dl> <h2 id="例子">例子</h2> <p>下面的两个例子演示了 <code>clearMeasures()</code> 的用法。</p> <pre class="brush: js">function clear_measure(name) { if (performance.clearMeasures === undefined) { console.log("performance.clearMeasures Not supported"); return; } // 根据给定的 name <code>移除所有标记类型为 "measure" 的性能入口</code> performance.clearMeasures(name); } function clear_all_measures() { if (performance.clearMeasures === undefined) { console.log("performance.clearMeasures Not supported"); return; } // <code>移除性能缓存区中所有标记类型为 "measure" 的性能入口</code> performance.clearMeasures(); } </pre> <h2 id="规范">规范</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('User Timing Level 2', '#dom-performance-clearmeasures', 'clearMeasures()')}}</td> <td>{{Spec2('User Timing Level 2')}}</td> <td>Clarifies <code>clearMeasures()</code>.</td> </tr> <tr> <td>{{SpecName('User Timing', '#dom-performance-clearmeasures', 'clearMeasures()')}}</td> <td>{{Spec2('User Timing')}}</td> <td>Basic definition.</td> </tr> </tbody> </table> <h2 id="浏览器兼容性">浏览器兼容性</h2> {{Compat("api.Performance.clearMeasures")}}