---
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>