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119 lines
4.4 KiB
HTML
119 lines
4.4 KiB
HTML
<article id="wikiArticle">
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<div> </div>
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<p><code><strong>add()</strong></code> 方法用来向一个 <code>Set</code> 对象的末尾添加一个指定的值。</p>
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<h2 id="Syntax" name="Syntax">语法</h2>
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<pre class="syntaxbox"><code><em>mySet</em>.add(value);</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt>value</dt>
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<dd>必需。需要添加到 <code>Set </code>对象的元素的值。</dd>
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</dl>
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<h3 id="返回值">返回值</h3>
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<p><code>Set</code> 对象本身</p>
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<p>注意：不能添加重复的值</p>
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<h2 id="Examples" name="Examples">示例</h2>
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<pre class="brush: js">var mySet = new Set();
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mySet.add(1);
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mySet.add(5).add("some text"); // 可以链式调用
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console.log(mySet);
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// Set [1, 5, "some text"]
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mySet.add(5).add(1);
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console.log(mySet);
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//Set [1, 5] // 重复的值没有被添加进去</pre>
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<p> </p>
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<p> </p>
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<p> </p>
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<p> </p>
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<p> </p>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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<tr>
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<th scope="col">Specification</th>
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<th scope="col">Status</th>
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<th scope="col">Comment</th>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-set.prototype.add" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Set.prototype.add</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td>Initial definition.</td>
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</tr>
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<tr>
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<td><a class="external" href="https://tc39.github.io/ecma262/#sec-set.prototype.add" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Set.prototype.add</small></a></td>
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<td><span class="spec-Draft">Draft</span></td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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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>38</td>
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<td><a href="/en-US/Firefox/Releases/13" title="Released on 2012-06-05.">13.0</a> (13.0)</td>
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<td>11</td>
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<td>25</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>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>38</td>
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<td>13.0 (13.0)</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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<h2 id="火狐备注">火狐备注</h2>
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<ul>
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<li>低于 Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30)的版本，<code>Set.prototype.add</code> 会返回<code>undefined 并且不可链式调用。</code> 该问题(<a class="external" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1031632" rel="noopener" title="FIXED: Map.prototype.set, WeakMap.prototype.set and Set.prototype.add should be chainable">bug 1031632</a>)已修复。Chrome/v8 中也有该问题 (<a class="external" href="https://code.google.com/p/v8/issues/detail?id=3410" rel="noopener">issue</a>).</li>
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</ul>
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<h2 id="相关链接">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/Set" title="Set 对象允许你存储任何类型的唯一值，无论是原始值或者是对象引用。"><code>Set</code></a></li>
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<li><a href="Reference/Global_Objects/Set/delete" title="delete() 方法可以从一个 Set 对象中删除指定的元素。"><code>Set.prototype.delete()</code></a></li>
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<li><a href="Reference/Global_Objects/Set/has" title="has() 方法返回一个布尔值来指示对应的值value是否存在Set对象中。"><code>Set.prototype.has()</code></a></li>
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</ul>
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</article> |