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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: RegExp.input ($_)
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/input
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/input
+---
+<div>{{JSRef}} {{non-standard_header}}</div>
+
+<p><strong><code>input</code> </strong>非标准属性是正则表达式静态属性,含有正则表达式所匹配的字符串。<code>RegExp.$_</code>是这个属性的别名。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>RegExp</var>.input
+RegExp.$_
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p><code>input</code> 属性是静态的,并不是正则表达式独立对象的属性。反之,你应始终将其使用为 <code>RegExp.input</code> 或者 <code>RegExp.$_。</code></p>
+
+<p>当正则表达式上搜索的字符串发生改变,并且字符串匹配时,<code><strong>input</strong></code> 属性的值会修改。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_input_和__">使用 <code>input</code> 和 <code>$_</code></h3>
+
+<pre class="brush: js">var re = /hi/g;
+re.test('hi there!');
+RegExp.input; // "hi there!"
+re.test('foo'); // 新测试,不匹配
+RegExp.$_; // "hi there!"
+re.test('hi world!'); // 新测试,匹配
+RegExp.$_; // "hi world!"
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>非标准。并不是任何现行规范的一部分。</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Chrome for Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.lastMatch", "RegExp.lastMatch ($&amp;)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.lastParen", "RegExp.lastParen ($+)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.leftContext", "RegExp.leftContext ($`)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.rightContext", "RegExp.rightContext ($')")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.n", "RegExp.$1-$9")}}</li>
+</ul>