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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.join()
+slug: Web/JavaScript/Reference/Global_Objects/Array/join
+tags:
+ - Array
+ - Array.prototype.join()
+ - join()
+ - separator
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/join
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>join()</strong></code> 方法将一个数组(或一个<a href="/zh-CN//docs/Web/JavaScript/Guide/Indexed_collections#Working_with_array-like_objects">类数组对象</a>)的所有元素连接成一个字符串并返回这个字符串。如果数组只有一个项目,那么将返回该项目而不使用分隔符。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/array-join.html")}}</div>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre><var>arr</var>.join([<var>separator</var>])</pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>separator</code> {{optional_inline}}</dt>
+ <dd>指定一个字符串来分隔数组的每个元素。如果需要,将分隔符转换为字符串。如果缺省该值,数组元素用逗号(<code>,</code>)分隔。如果<code>separator</code>是空字符串(<code>""</code>),则所有元素之间都没有任何字符。</dd>
+ <dt>
+ <h3 id="返回值">返回值</h3>
+ </dt>
+ <dd>一个所有数组元素连接的字符串。如果 <code>arr.length</code><strong> </strong>为0,则返回空字符串。</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>所有的数组元素被转换成字符串,再用一个分隔符将这些字符串连接起来。</p>
+
+<div class="blockIndicator warning">
+<p>如果一个元素为 <code>undefined</code> 或 <code>null</code>,它会被转换为空字符串。</p>
+</div>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Example_Joining_an_array_three_different_ways" name="Example:_Joining_an_array_three_different_ways">使用四种不同的分隔符连接数组元素</h3>
+
+<p>下例首先创建了一个数组 <code>a</code>,包含有三个元素,然后用四种不同的分隔符连接所有数组元素。首先是默认的分隔符逗号,然后是一个逗号加空格,接下来是一个加号前后加空格,最后是一个空字符串。</p>
+
+<pre class="brush: js">var a = ['Wind', 'Rain', 'Fire'];
+var myVar1 = a.join(); // myVar1的值变为"Wind,Rain,Fire"
+var myVar2 = a.join(', '); // myVar2的值变为"Wind, Rain, Fire"
+var myVar3 = a.join(' + '); // myVar3的值变为"Wind + Rain + Fire"
+var myVar4 = a.join(''); // myVar4的值变为"WindRainFire"
+</pre>
+
+<h3 id="连接类数组对象">连接类数组对象</h3>
+
+<p>下面的示例将连接类数组对象(arguments),通过在<code>Array.prototype.join</code>上调用{{jsxref("Function.prototype.call")}}。</p>
+
+<pre class="brush: js"><code>function f(a, b, c) {
+ var s = Array.prototype.join.call(arguments);
+ console.log(s); // '1,a,true'
+}
+f(1, 'a', true);</code></pre>
+
+<h2 id="Specifications" name="Specifications">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('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>Initial definition. Implemented in JavaScript 1.1.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.4.4.5', 'Array.prototype.join')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-array.prototype.join', 'Array.prototype.join')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-array.prototype.join', 'Array.prototype.join')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td></td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<div>
+<div>
+
+
+<p>{{Compat("javascript.builtins.Array.join")}}</p>
+</div>
+</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.split()")}}</li>
+ <li>{{jsxref("Array.prototype.toString()")}}</li>
+ <li>{{jsxref("TypedArray.prototype.join()")}}</li>
+</ul>