---
title: debugger
slug: Web/JavaScript/Reference/Statements/debugger
tags:
  - JavaScript
  - Statement
translation_of: Web/JavaScript/Reference/Statements/debugger
---
<p>{{jsSidebar("Statements")}}</p>

<p><strong>debugger 语句</strong>调用任何可用的调试功能，例如设置断点。 如果没有调试功能可用，则此语句不起作用。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox" style="font-size: 14px; white-space: normal;"><code>debugger;</code>
</pre>

<h2 id="示例">示例</h2>

<p>下面的例子演示了一个包含 debugger 语句的函数，当函数被调用时，会尝试调用一个可用的调试器进行调试。</p>

<pre class="brush:js  language-js" style="padding: 1em 0px 1em 30px; font-size: 14px; white-space: normal; color: rgb(77, 78, 83);"><code class="language-js" style="direction: ltr; white-space: pre;"><span class="keyword token" style="color: #0077aa;">function</span> <span class="function token" style="color: #dd4a68;">potentiallyBuggyCode<span class="punctuation token" style="color: #999999;">(</span></span><span class="punctuation token" style="color: #999999;">)</span> <span class="punctuation token" style="color: #999999;">{</span>
    <span class="keyword token" style="color: #0077aa;">debugger</span><span class="punctuation token" style="color: #999999;">;</span>
   <span class="comment token" style="color: #708090;"> // do potentially buggy stuff to examine, step through, etc.
</span><span class="punctuation token" style="color: #999999;">}</span></code></pre>

<p>当 debugger 被调用时, 执行暂停在 debugger 语句的位置。就像在脚本源代码中的断点一样。</p>

<p><a href="https://mdn.mozillademos.org/files/6963/Screen%20Shot%202014-02-07%20at%209.14.35%20AM.png"><img alt="Paused at a debugger statement." src="https://mdn.mozillademos.org/files/6963/Screen%20Shot%202014-02-07%20at%209.14.35%20AM.png" style="height: 371px; width: 700px;"></a></p>

<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('ESDraft', '#sec-debugger-statement', 'Debugger statement')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-debugger-statement', 'Debugger statement')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-12.15', 'Debugger statement')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td>Initial definition</td>
  </tr>
  <tr>
   <td>{{SpecName('ES3', '#sec-7.5.3', 'Debugger statement')}}</td>
   <td>{{Spec2('ES3')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES1', '#sec-7.4.3', 'Debugger statement')}}</td>
   <td>{{Spec2('ES1')}}</td>
   <td>Only mentioned as reserved word.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容">浏览器兼容</h2>

<p>{{Compat("javascript.statements.debugger")}}</p>

<h2 id="See_also" name="See_also">相关链接</h2>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/docs/Debugging_JavaScript">JavaScript调试</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Tools/Debugger">在火狐开发者工具中调试</a></li>
</ul>