### 返回值:StringjQuery.parseJSON(json)
### 概述
接受一个JSON字符串，返回解析后的对象。
传入一个畸形的JSON字符串会抛出一个异常。比如下面的都是畸形的JSON字符串：
- {test: 1} （ test 没有包围双引号）
- {'test': 1} （使用了单引号而不是双引号）
另外，如果你什么都不传入，或者一个空字符串、null或undefined，parseJSON都会返回 null 。
### 参数
#### **json**String*V1.4.1*
要解析的JSON字符串
### 示例
#### 描述:
解析一个JSON字符串
##### jQuery 代码:
~~~
var obj = jQuery.parseJSON('{"name":"John"}');
alert( obj.name === "John" );
~~~
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