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89 lines
3.3 KiB
HTML
89 lines
3.3 KiB
HTML
<article id="wikiArticle">
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<div> <div class="blockIndicator obsolete obsoleteHeader"><p><strong><span class="icon-only-inline" title="This is an obsolete API and is no longer guaranteed to work."><i class="icon-trash"> </i></span> 已废弃</strong><br/>This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.</p></div></div>
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<p><code><strong>clear()</strong></code>用来从 <code>WeakMap对象中移除所有元素。</code>但不再是ECMAScript和它的实现部分。</p>
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<div class="warning">
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<p>Warning:</p>
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<p><img alt="WeakMap(no clear() any more).png" src="https://mdn.mozillademos.org/files/15608/WeakMap(no%20clear()%20any%20more).png" style="height: 490px; width: 735px;"/></p>
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</div>
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<h2 id="语法">语法</h2>
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<pre class="syntaxbox"><em>wm</em>.clear();</pre>
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<h2 id="示例">示例</h2>
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<h3 id="使用_clear_方法">使用 <code>clear</code> 方法</h3>
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<pre class="brush: js;highlight:[10] example-bad">var wm = new WeakMap();
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var obj = {};
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wm.set(obj, "foo");
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wm.set(window, "bar");
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wm.has(obj); // true
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wm.has(window); // true
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wm.clear();
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wm.has(obj) // false
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wm.has(window) // false
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</pre>
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<h2 id="规范">规范</h2>
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<p>当前版本或者起草中没有这个方法，这个方法在版本 28（2014 年 10 月 14） 之前是 ECMAScript 6 起草规范的一部分，但是在起草之后的版本中被移除了。它不在是最终标准的一部分了 。</p>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
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This compatibility table still uses the old format,
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because we haven't yet converted the data it contains.
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<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<div class="htab">
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<ul>
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<li class="selected"><a>Desktop</a></li>
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<li><a>Mobile</a></li>
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</ul>
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</div><p></p>
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<div id="compat-desktop">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Chrome</th>
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<th>Firefox (Gecko)</th>
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<th>Internet Explorer</th>
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<th>Opera</th>
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<th>Safari</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td>36</td>
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<td><span style="color: #f00;">未实现</span> [1]</td>
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<td>11</td>
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<td>23</td>
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<td>7.1</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div id="compat-mobile">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Android</th>
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<th>Firefox Mobile (Gecko)</th>
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<th>IE Mobile</th>
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<th>Opera Mobile</th>
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<th>Safari Mobile</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span> [1]</td>
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<td><span style="color: #f00;">未实现</span></td>
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<td><span style="color: #f00;">未实现</span></td>
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<td>8</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>[1] The <code>clear()</code> 曾经在高于 20 版本低于 45 版本之间被支持。</p>
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<h2 id="相近">相近</h2>
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<ul>
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<li><a href="Reference/WeakMap" title="此页面仍未被本地化, 期待您的翻译!"><code>WeakMap</code></a></li>
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</ul>
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</article> |