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156 lines
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156 lines
13 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<p> <code><strong>concat()</strong></code> 方法用于合并两个或多个数组。此方法不会更改现有数组,而是返回一个新数组。</p>
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<p><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/array-concat.html" width="100%"></iframe></p>
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<h2 id="语法">语法</h2>
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<pre><code class="language-javascript">var <var>new_array</var> = <var>old_array</var>.concat(<var>value1</var>[, <var>value2</var>[, ...[, <var>valueN</var>]]])</code></pre>
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<h3 id="Parameters" name="Parameters">参数</h3>
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<dl>
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<dt><code>value<em>N</em></code><span class="inlineIndicator optional optionalInline">可选</span></dt>
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<dd>将数组和/或值连接成新数组。详情请参阅下文描述。</dd>
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</dl>
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<h3 id="返回值">返回值</h3>
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<p>新的 <a href="Reference/Array" title="REDIRECT Array"><code>Array</code></a> 实例。</p>
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<h2 id="Description" name="Description">描述</h2>
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<p><code>concat</code>方法创建一个新的数组,它由被调用的对象中的元素组成,每个参数的顺序依次是该参数的元素(如果参数是数组)或参数本身(如果参数不是数组)。它不会递归到嵌套数组参数中。</p>
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<p><code>concat</code>方法不会改变<code>this</code>或任何作为参数提供的数组,而是返回一个浅拷贝,它包含与原始数组相结合的相同元素的副本。 原始数组的元素将复制到新数组中,如下所示:</p>
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<ul>
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<li>对象引用(而不是实际对象):<code>concat</code>将对象引用复制到新数组中。 原始数组和新数组都引用相同的对象。 也就是说,如果引用的对象被修改,则更改对于新数组和原始数组都是可见的。 这包括也是数组的数组参数的元素。</li>
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</ul>
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<ul>
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<li>数据类型如字符串,数字和布尔(不是<a href="Reference/Global_Objects/String" title="String 全局对象是一个用于字符串或一个字符序列的构造函数。"><code>String</code></a>,<a href="Reference/Global_Objects/Number" title="JavaScript 的 Number 对象是经过封装的能让你处理数字值的对象。Number 对象由 Number() 构造器创建。"><code>Number</code></a> 和 <a href="Reference/Global_Objects/Boolean" title="Boolean对象是一个布尔值的对象包装器。"><code>Boolean</code></a> 对象):<code>concat</code>将字符串和数字的值复制到新数组中。</li>
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</ul>
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<div class="note">
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<p><strong>注意:</strong>数组/值在连接时保持不变。此外,对于新数组的任何操作(仅当元素不是对象引用时)都不会对原始数组产生影响,反之亦然。</p>
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</div>
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<h2 id="Examples" name="Examples">示例</h2>
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<h3 id="Example:_Concatenating_two_arrays" name="Example:_Concatenating_two_arrays">连接两个数组</h3>
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<p>以下代码将两个数组合并为一个新数组:</p>
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<pre><code class="language-javascript">var alpha = ['a', 'b', 'c'];
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var numeric = [1, 2, 3];
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alpha.concat(numeric);
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// result in ['a', 'b', 'c', 1, 2, 3]</code></pre>
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<h3 id="Example:_Concatenating_three_arrays" name="Example:_Concatenating_three_arrays">连接三个数组</h3>
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<p>以下代码将三个数组合并为一个新数组:</p>
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<pre><code class="language-javascript">var num1 = [1, 2, 3],
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num2 = [4, 5, 6],
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num3 = [7, 8, 9];
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var nums = num1.concat(num2, num3);
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console.log(nums);
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// results in [1, 2, 3, 4, 5, 6, 7, 8, 9]</code></pre>
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<h3 id="Example:_Concatenating_values_to_an_array" name="Example:_Concatenating_values_to_an_array">将值连接到数组</h3>
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<p>以下代码将三个值连接到数组:</p>
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<pre><code class="language-javascript">var alpha = ['a', 'b', 'c'];
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var alphaNumeric = alpha.concat(1, [2, 3]);
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console.log(alphaNumeric);
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// results in ['a', 'b', 'c', 1, 2, 3]</code></pre>
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<h3 id="合并嵌套数组">合并嵌套数组</h3>
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<p>以下代码合并数组并保留引用:</p>
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<pre><code class="language-javascript">var num1 = [[1]];
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var num2 = [2, [3]];
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var nums = num1.concat(num2);
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console.log(nums);
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// results in [[1], 2, [3]]
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// modify the first element of num1
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num1[0].push(4);
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console.log(nums);
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// results in [[1, 4], 2, [3]]</code></pre>
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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/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf" hreflang="en" lang="en" rel="noopener" title="ECMAScript 3rd Edition (ECMA-262)">ECMAScript 3rd Edition (ECMA-262)</a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td>Initial definition. Implemented in JavaScript 1.2.</td>
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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-262/5.1/#sec-15.4.4.4" hreflang="en" lang="en" rel="noopener">ECMAScript 5.1 (ECMA-262)<br/><small lang="zh-CN">Array.prototype.concat</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td> </td>
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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-array.prototype.concat" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Array.prototype.concat</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td> </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-array.prototype.concat" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Array.prototype.concat</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">浏览器兼容</h2>
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<div class="hidden">
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<p>The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
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</div>
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<p></p><div class="bc-data"><a class="bc-github-link external" href="https://github.com/mdn/browser-compat-data" rel="noopener">Update compatibility data on GitHub</a><table class="bc-table bc-table-js"><thead><tr class="bc-platforms"><td></td><th class="bc-platform-desktop" colspan="6"><span>Desktop</span></th><th class="bc-platform-mobile" colspan="7"><span>Mobile</span></th><th class="bc-platform-server" colspan="1"><span>Server</span></th></tr><tr class="bc-browsers"><td></td><th class="bc-browser-chrome"><span class="bc-head-txt-label bc-head-icon-chrome">Chrome</span></th><th class="bc-browser-edge"><span class="bc-head-txt-label bc-head-icon-edge">Edge</span></th><th class="bc-browser-firefox"><span class="bc-head-txt-label bc-head-icon-firefox">Firefox</span></th><th class="bc-browser-ie"><span class="bc-head-txt-label bc-head-icon-ie">Internet Explorer</span></th><th class="bc-browser-opera"><span class="bc-head-txt-label bc-head-icon-opera">Opera</span></th><th class="bc-browser-safari"><span class="bc-head-txt-label bc-head-icon-safari">Safari</span></th><th class="bc-browser-webview_android"><span class="bc-head-txt-label bc-head-icon-webview_android">Android webview</span></th><th class="bc-browser-chrome_android"><span class="bc-head-txt-label bc-head-icon-chrome_android">Chrome for Android</span></th><th class="bc-browser-edge_mobile"><span class="bc-head-txt-label bc-head-icon-edge_mobile">Edge Mobile</span></th><th class="bc-browser-firefox_android"><span class="bc-head-txt-label bc-head-icon-firefox_android">Firefox for Android</span></th><th class="bc-browser-opera_android"><span class="bc-head-txt-label bc-head-icon-opera_android">Opera for Android</span></th><th class="bc-browser-safari_ios"><span class="bc-head-txt-label bc-head-icon-safari_ios">Safari on iOS</span></th><th class="bc-browser-samsunginternet_android"><span class="bc-head-txt-label bc-head-icon-samsunginternet_android">Samsung Internet</span></th><th class="bc-browser-nodejs"><span class="bc-head-txt-label bc-head-icon-nodejs">Node.js</span></th></tr></thead><tbody><tr><th scope="row"><code>concat</code></th><td class="bc-supports-yes bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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1</td><td class="bc-supports-yes bc-browser-edge"><span class="bc-browser-name">Edge</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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12</td><td class="bc-supports-yes bc-browser-firefox"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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1</td><td class="bc-supports-yes bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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5.5</td><td class="bc-supports-yes bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-firefox_android"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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4</td><td class="bc-supports-yes bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-nodejs"><span class="bc-browser-name">nodejs</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td></tr></tbody></table><section class="bc-legend" id="sect1"><h3 class="offscreen" id="Legend">Legend</h3><dl><dt><span class="bc-supports-yes bc-supports">
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<abbr class="bc-level bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr></span></dt><dd>Full support</dd></dl></section></div><p></p>
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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/Array/push" title="push() 方法将一个或多个元素添加到数组的末尾,并返回该数组的新长度。"><code>push</code></a> / <a href="Reference/Global_Objects/Array/pop" title="pop()方法从数组中删除最后一个元素,并返回该元素的值。此方法更改数组的长度。"><code>pop</code></a> — add/remove elements from the end of the array</li>
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<li><a href="Reference/Global_Objects/Array/unshift" title="unshift() 方法将一个或多个元素添加到数组的开头,并返回该数组的新长度。"><code>unshift</code></a> / <a href="Reference/Global_Objects/Array/shift" title="shift() 方法从数组中删除第一个元素,并返回该元素的值。此方法更改数组的长度。"><code>shift</code></a> — add/remove elements from the beginning of the array</li>
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<li><a href="Reference/Global_Objects/Array/splice" title="splice() 方法通过删除或替换现有元素来修改数组,并以数组形式返回被修改的内容。此方法会改变原数组。"><code>splice</code></a> — add/remove elements from the specified location of the array</li>
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<li><a href="Reference/Global_Objects/String/concat" title="concat() 方法将一个或多个字符串与原字符串连接合并,形成一个新的字符串并返回。"><code>String.prototype.concat()</code></a></li>
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<li><a href="Reference/Global_Objects/Symbol/isConcatSpreadable" title="内置的Symbol.isConcatSpreadable符号用于配置某对象作为Array.prototype.concat()方法的参数时是否展开其数组元素。"><code>Symbol.isConcatSpreadable</code></a> – control flattening.</li>
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</ul>
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</article> |