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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Array.prototype.concat()
+slug: Web/JavaScript/Reference/Global_Objects/Array/concat
+tags:
+ - JavaScript
+ - 原型
+ - 数组
+ - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/concat
+---
+<div>{{JSRef}}</div>
+
+<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>
+
+<p>{{EmbedInteractiveExample("pages/js/array-concat.html")}}</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">var <var>new_array</var> = <var>old_array</var>.concat(<var>value1</var>[, <var>value2</var>[, ...[, <var>valueN</var>]]])</pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>value<em>N</em></code>{{optional_inline}}</dt>
+ <dd>数组和/或值,将被合并到一个新的数组中。如果省略了所有 <code>valueN</code> 参数,则 <code>concat</code> 会返回调用此方法的现存数组的一个浅拷贝。详情请参阅下文描述。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>新的 {{jsxref("Array")}} 实例。</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<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>
+
+<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>
+
+<ul>
+ <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>
+</ul>
+
+<ul>
+ <li>数据类型如字符串,数字和布尔(不是{{jsxref("Global_Objects/String", "String")}},{{jsxref("Global_Objects/Number", "Number")}} 和 {{jsxref("Global_Objects/Boolean", "Boolean")}} 对象):<code>concat</code>将字符串和数字的值复制到新数组中。</li>
+</ul>
+
+<div class="note">
+<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>
+</div>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Example_Concatenating_two_arrays" name="Example:_Concatenating_two_arrays">连接两个数组</h3>
+
+<p>以下代码将两个数组合并为一个新数组:</p>
+
+<pre class="brush: js notranslate">var alpha = ['a', 'b', 'c'];
+var numeric = [1, 2, 3];
+
+alpha.concat(numeric);
+// result in ['a', 'b', 'c', 1, 2, 3]</pre>
+
+<h3 id="Example_Concatenating_three_arrays" name="Example:_Concatenating_three_arrays">连接三个数组</h3>
+
+<p>以下代码将三个数组合并为一个新数组:</p>
+
+<pre class="brush: js notranslate">var num1 = [1, 2, 3],
+ num2 = [4, 5, 6],
+ num3 = [7, 8, 9];
+
+var nums = num1.concat(num2, num3);
+
+console.log(nums);
+// results in [1, 2, 3, 4, 5, 6, 7, 8, 9]</pre>
+
+<h3 id="Example_Concatenating_values_to_an_array" name="Example:_Concatenating_values_to_an_array">将值连接到数组</h3>
+
+<p>以下代码将三个值连接到数组:</p>
+
+<pre class="brush: js notranslate">var alpha = ['a', 'b', 'c'];
+
+var alphaNumeric = alpha.concat(1, [2, 3]);
+
+console.log(alphaNumeric);
+// results in ['a', 'b', 'c', 1, 2, 3]</pre>
+
+<h3 id="合并嵌套数组">合并嵌套数组</h3>
+
+<p>以下代码合并数组并保留引用:</p>
+
+<pre class="brush: js notranslate">var num1 = [[1]];
+var num2 = [2, [3]];
+var num3=[5,[6]];
+
+var nums = num1.concat(num2);
+
+console.log(nums);
+// results is [[1], 2, [3]]
+
+var nums2=num1.concat(4,num3);
+
+console.log(nums2)
+// results is [[1], 4, 5,[6]]
+
+// modify the first element of num1
+num1[0].push(4);
+
+console.log(nums);
+// results is [[1, 4], 2, [3]]</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('ES3')}}</td>
+ <td>{{Spec2('ES3')}}</td>
+ <td>Initial definition. Implemented in JavaScript 1.2.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.4.4.4', 'Array.prototype.concat')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-array.prototype.concat', 'Array.prototype.concat')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-array.prototype.concat', 'Array.prototype.concat')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<div class="hidden">
+<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 href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+</div>
+
+<p>{{Compat("javascript.builtins.Array.concat")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Array.push", "push")}} / {{jsxref("Array.pop", "pop")}} — add/remove elements from the end of the array</li>
+ <li>{{jsxref("Array.unshift", "unshift")}} / {{jsxref("Array.shift", "shift")}} — add/remove elements from the beginning of the array</li>
+ <li>{{jsxref("Array.splice", "splice")}} — add/remove elements from the specified location of the array</li>
+ <li>{{jsxref("String.prototype.concat()")}}</li>
+ <li>{{jsxref("Symbol.isConcatSpreadable")}} – control flattening.</li>
+</ul>