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+---
+title: RegExp.rightContext ($')
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/rightContext
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/rightContext
+---
+<div>{{JSRef}} {{non-standard_header}}</div>
+
+<p><strong>rightContext </strong>非标准属性是正则表达式的静态和只读属性，含有最新匹配的右侧子串。 <code>RegExp.$'</code> 是这个属性的别名。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><var>RegExp</var>.rightContext
+RegExp["$'"]</code>
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p><code>rightContext</code> 属性是静态的，不是正则表达式独立对象的属性。反之，你应始终将其使用为 <code>RegExp.rightContext</code> 或者 <code>RegExp["$'"]</code>。</p>
+
+<p><code>rightContext</code> 属性的值是只读的，并且会在匹配成功时修改。</p>
+
+<p>你不能使用属性访问器(<code>RegExp.$'</code>)来使用简写的别名，因为解析器在这里会将其看做字符串的开始，并抛出 {{jsxref("SyntaxError")}}。使用 <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors">方括号符号</a>来访问属性。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_rightContext_和_'">使用 <code>rightContext</code> 和 <code>$'</code></h3>
+
+<pre class="brush: js">var re = /hello/g;
+re.test('hello world!');
+RegExp.rightContext; // " world!"
+RegExp["$'"];       // " world!"
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>非标准。并不是任何现行规范的一部分。</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.input", "RegExp.input ($_)")}}</li>
+ <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.n", "RegExp.$1-$9")}}</li>
+</ul>