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76 lines
3.2 KiB
HTML
76 lines
3.2 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 Gecko 2 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)</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This feature is obsolete.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> <strong><code>__count__</code></strong> 属性曾经用来存放对象的可枚举的属性的个数，但是已经被废除。</p>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript"><code><var>obj</var>.__count__</code></code></pre>
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<h2 id="示例">示例</h2>
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<pre><code class="language-javascript">{ 1: 1 }.__count__ // 1
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[].__count__ // 0
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[1].__count__ // 1
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[1, /* hole */, 2, 3].__count__ // 3
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</code></pre>
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<h2 id="详细说明">详细说明</h2>
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<p>无需详细说明</p>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<div><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></div>
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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><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><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><span style="color: #f00;">未实现</span></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>Chrome for 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></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><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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</tr>
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</tbody>
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</table>
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</div>
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<h2 id="更多请参看">更多请参看</h2>
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<ul>
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<li><a class="external" href="http://whereswalden.com/2010/04/06/more-changes-coming-to-spidermonkey-the-magical-__count__-property-of-objects-is-being-removed/" rel="noopener">[Blog post] More changes coming to SpiderMonkey: the magical __count__ property is being removed</a></li>
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</ul>
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</article> |