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+---
+title: Object.prototype.toSource()
+slug: Web/JavaScript/Reference/Global_Objects/Object/toSource
+tags:
+  - JavaScript
+  - Method
+  - Object
+  - Prototype
+translation_of: Web/JavaScript/Reference/Global_Objects/Object/toSource
+---
+<div>
+<div>{{JSRef}} {{non-standard_header}}</div>
+</div>
+
+<p><strong><code>toSource()</code></strong>方法返回一个表示对象源代码的字符串。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code><em>Object.toSource(); obj</em>.toSource()</code></pre>
+
+<h3 id="Parameters" name="Parameters">返回值</h3>
+
+<p>一个表示对象的源代码的字符串。</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p><code>toSource()</code>方法返回以下值:</p>
+
+<ul>
+ <li>对于内置的{{jsxref("Object")}} 对象, <code>toSource</code>返回了下面的字符串，表示源码没法获取：</li>
+</ul>
+
+<pre class="brush: js">function Object() {
+   [native code]
+}</pre>
+
+<ul>
+ <li>对于{{jsxref("Object")}}的实例，<code>toSource()</code> 会返回该实例源代码的字符串表示。</li>
+</ul>
+
+<p>在调试时,你可以通过<code>toSource()</code>来查看一个对象的内容。</p>
+
+<h3 id="重写toSource()方法">重写toSource()方法</h3>
+
+<p>允许对象重写<code>toSource()</code>方法。例如：</p>
+
+<pre class="brush: js">function Person(name) {
+    this.name = name;
+}
+
+Person.prototype.toSource = function Person_toSource() {
+    return "new Person(" + uneval(this.name) + ")";
+};
+
+alert(new Person("Joe").toSource()); // ---&gt; new Person("Joe")</pre>
+
+<h3 id="Built-in_toString_methods" name="Built-in_toString_methods">内置<code>的toSource方法</code></h3>
+
+<p>每个JavaScript核心类型都有它自己的<code>toSource()</code>方法.这些对象是：</p>
+
+<ul>
+ <li>{{jsxref("Array.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Array")}} object.</li>
+ <li>{{jsxref("Boolean.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Boolean")}} object.</li>
+ <li>{{jsxref("Date.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Date")}} object.</li>
+ <li>{{jsxref("Function.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Function")}} object.</li>
+ <li>{{jsxref("Number.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Number")}} object.</li>
+ <li>{{jsxref("RegExp.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("RegExp")}} object.</li>
+ <li>{{jsxref("SIMD.toSource()", "SIMD.%type%.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("SIMD")}} objects.</li>
+ <li>{{jsxref("String.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("String")}} object.</li>
+ <li>{{jsxref("Symbol.prototype.toSource()")}} {{non-standard_inline}} — {{jsxref("Symbol")}} object.</li>
+ <li><code>Math.toSource()</code> — Returns the String "Math".</li>
+</ul>
+
+<h3 id="循环引用限制">循环引用限制</h3>
+
+<p><span id="noHighlight_0.3266603437527873">对于包含对自身的引用的对象 (例如, 循环链表或可以遍历两种方式的树), </span><code>toSource()</code><span>不会重新创建自引用, 如火狐24。例如:</span></p>
+
+<pre class="brush: js">var obj1 = {};
+var obj2 = { a: obj1 };
+obj1.b = obj2;
+
+console.log('Cyclical: ' + (obj1.b.a == obj1));
+
+var objSource = obj1.toSource(); // returns "({b:{a:{}}})"
+
+obj1 = eval(objSource);
+
+console.log('Cyclical: ' + (obj1.b.a == obj1));</pre>
+
+<p><span id="noHighlight_0.30716570898096807">如果使用循环结构, 并且需要 </span><code>toSource()</code><span>, 则对象必须提供对 </span><code>toSource()</code><span> 的重写,  无论是对构造函数的引用还是提供匿名函数。</span></p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Example:_Using_toSource" name="Example:_Using_toSource">使用<code>toSource()</code></h3>
+
+<p>下面的代码定义了一个<code>Dog</code>对象类型还创建了一个<code>Dog</code>类型的对象实例<code>theDog</code>：</p>
+
+<pre class="brush:js">function Dog(name, breed, color, sex) {
+   this.name = name;
+   this.breed = breed;
+   this.color = color;
+   this.sex = sex;
+}
+
+theDog = new Dog("Gabby", "Lab", "chocolate", "girl");</pre>
+
+<p>在<code>theDog</code>上调用<code>toSource</code>方法会显示出能定义该对象的源码：</p>
+
+<pre class="brush: js">theDog.toSource();
+// returns ({name:"Gabby", breed:"Lab", color:"chocolate", sex:"female"})</pre>
+
+<h2 id="特性">特性</h2>
+
+<p>不属于任何标准的一部分。在JavaScript1.3中实现。</p>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<div class="hidden">The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
+
+<p>{{Compat("javascript.builtins.Object.toSource")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Object.prototype.toString()")}}</li>
+</ul>
+
+<p></p>