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+---
+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>