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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/javascript/reference/global_objects/regexp/@@split | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/javascript/reference/global_objects/regexp/@@split/index.html b/files/zh-cn/web/javascript/reference/global_objects/regexp/@@split/index.html new file mode 100644 index 0000000000..b3bfa32317 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/regexp/@@split/index.html @@ -0,0 +1,151 @@ +--- +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 => "(" + 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> |