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+---
+title: RegExp.prototype.toString()
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/toString
+tags:
+  - JavaScript
+  - Method
+  - Prototype
+  - RegExp
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/toString
+---
+<div>
+ {{JSRef("Global_Objects", "RegExp")}}</div>
+<h2 id="Summary" name="Summary">概述</h2>
+<p><code><strong>toString()</strong></code> 返回一个表示该正则表达式的字符串。</p>
+<h2 id="Syntax" name="Syntax">语法</h2>
+<pre class="syntaxbox"><var>regexObj</var>.toString()</pre>
+<h3 id="Parameters" name="Parameters">参数</h3>
+<p>无</p>
+<h2 id="Description" name="Description">描述</h2>
+<p>{{jsxref("Global_Objects/RegExp", "RegExp")}} 对象覆盖了 {{jsxref("Global_Objects/Object", "Object")}} 对象的 <code>toString()</code> 方法，并没有继承 {{jsxref("Object.prototype.toString()")}}。对于 <code>RegExp</code> 对象，<code>toString</code> 方法返回一个该正则表达式的字符串形式。</p>
+<h2 id="Examples" name="Examples">示例</h2>
+<h3 id="Example:_Using_toString" name="Example:_Using_toString">例子：使用 <code>toString</code></h3>
+<p>下例输出 <code>RegExp</code> 对象的字符串值：</p>
+<pre>myExp = new RegExp("a+b+c");
+alert(myExp.toString());       // 显示 "/a+b+c/"
+
+foo = new RegExp("bar", "g");
+alert(foo.toString());         // 显示 "/bar/g"
+</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>ECMAScript 3rd Edition. Implemented in JavaScript 1.1</td>
+   <td>Standard</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.9.5.2', 'RegExp.prototype.toString')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-regexp.prototype.tostring', 'RegExp.prototype.toString')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+<p>{{ CompatibilityTable() }}</p>
+<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="See_Also" name="See_Also">相关链接</h2>
+<ul>
+ <li>{{jsxref("Object.prototype.toString()")}}</li>
+</ul>