blob: 66cd9b06850f4619d3b8e8bbc41893982e8ecc5a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
---
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>
<div>{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Edge</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari (WebKit)</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatChrome(43.0)}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>41</td>
<td>10</td>
<td>33</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>Android Webview</th>
<th>Edge</th>
<th>Firefox Mobile (Gecko)</th>
<th>Firefox OS</th>
<th>IE Phone</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
<th>Chrome for Android</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatNo}}</td>
<td>{{CompatChrome(46.0)}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>42</td>
<td>42</td>
<td>10</td>
<td>33</td>
<td>{{CompatNo}}</td>
<td>{{CompatChrome(46.0)}}</td>
</tr>
</tbody>
</table>
</div>
|
