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+---
+title: 'RegExp.prototype[@@split]()'
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/@@split
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/@@split
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>[@@split]()</code></strong> 方法切割 {{jsxref("String")}} 对象为一个其子字符串的数组 。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>regexp</var>[Symbol.split](str[, <var>limit</var>])</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>str</code></dt>
+ <dd>切割操作的目标字符串</dd>
+ <dt><code>limit</code></dt>
+ <dd>
+ <p>可选。一个为了限制切割数量的特定整数。 <code>[@@split]()</code> 防范仍会切割每个匹配正则模式的匹配项,直到切割数量达到该限制数,除非提前切割完字符串。</p>
+ </dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>包含其子字符串的{{jsxref("Array")}} 。</p>
+
+<h2 id="描述">描述</h2>
+
+<p>如果切割器是一个{{jsxref("RegExp")}}对象,这个方法就将在 {{jsxref("String.prototype.split()")}} 的内部调用。例如,下面的两个方法返回相同结果。</p>
+
+<pre class="brush: js">'a-b-c'.split(/-/);
+
+/-/[Symbol.split]('a-b-c');</pre>
+
+<p>这个方法为自定义 <code>RegExp</code> 子类中的匹配行为而存在。</p>
+
+<p>如果str参数不是一个{{jsxref("RegExp")}} 对象, {{jsxref("String.prototype.split()")}} 就不会调用该方法,也不会创建一个 {{jsxref("RegExp")}} 对象。示例</p>
+
+<h3 id="直接调用">直接调用</h3>
+
+<p>这个方法的使用方式和 {{jsxref("String.prototype.split()")}} 相同,不同之处是 <code>this</code> 和参数顺序。</p>
+
+<pre class="brush: js">var re = /-/g;
+var str = '2016-01-02';
+var result = re[Symbol.split](str);
+console.log(result); // ["2016", "01", "02"]
+</pre>
+
+<h3 id="在子类中使用_split">在子类中使用 <code>@@split</code></h3>
+
+<p>{{jsxref("RegExp")}} 的子类可以覆写 <code>[@@split]()</code>方法来修改默认行为。</p>
+
+<pre class="brush: js">class MyRegExp extends RegExp {
+ [Symbol.split](str, limit) {
+ var result = RegExp.prototype[Symbol.split].call(this, str, limit);
+ return result.map(x =&gt; "(" + x + ")");
+ }
+}
+
+var re = new MyRegExp('-');
+var str = '2016-01-02';
+var result = str.split(re); // String.prototype.split calls re[@@split].
+console.log(result); // ["(2016)", "(01)", "(02)"]
+</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('ES6', '#sec-regexp.prototype-@@split', 'RegExp.prototype[@@split]')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td>初始定义</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-regexp.prototype-@@split', 'RegExp.prototype[@@split]')}}</td>
+ <td>{{Spec2('ESDraft')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatGeckoDesktop(49)}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatGeckoMobile(49)}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.split()")}}</li>
+ <li>{{jsxref("RegExp.prototype.@@match()", "RegExp.prototype[@@match]()")}}</li>
+ <li>{{jsxref("RegExp.prototype.@@replace()", "RegExp.prototype[@@replace]()")}}</li>
+ <li>{{jsxref("RegExp.prototype.@@search()", "RegExp.prototype[@@search]()")}}</li>
+ <li>{{jsxref("RegExp.prototype.exec()")}}</li>
+ <li>{{jsxref("RegExp.prototype.test()")}}</li>
+</ul>