---
title: Function.prototype.toSource()
slug: Web/JavaScript/Reference/Global_Objects/Function/toSource
translation_of: Web/JavaScript/Reference/Global_Objects/Function/toSource
---
<div>
<div>{{JSRef("Global_Objects", "Function")}} {{non-standard_header}}</div>
</div>

<h2 id="Summary" name="Summary">概述</h2>

<p>返回函数的源代码的字符串表示.</p>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox"><code><var>function</var>.toSource();
Function.toSource();
</code></pre>

<h3 id="Parameters" name="Parameters">参数</h3>

<p>无</p>

<h2 id="Description" name="Description">描述</h2>

<p><code>toSource方法返回下面的值</code>:</p>

<p></p>

<ul>
 <li>对于内置的<code>Function</code>对象,<code>toSource</code>返回下面的字符串:</li>
</ul>

<pre class="brush: js"><code>function Function() {
    [native code]
}</code></pre>

<ul>
 <li>对于自定义函数来说, <code>toSource返回能定义该函数</code>的Javascript源码.</li>
</ul>

<p>该方法通常在引擎内部调用.你可以在调试的时候用该方法开查看一个函数的源代码.</p>

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

<ul>
 <li><a href="/zh-CN/docs/JavaScript/Reference/Global_Objects/Function/toString" title="JavaScript/Reference/Global_Objects/Function/toString">toString</a></li>
 <li><a href="/zh-CN/docs/JavaScript/Reference/Global_Objects/Object/valueOf" title="JavaScript/Reference/Global_Objects/Object/valueOf">Object.prototype.valueOf</a></li>
</ul>