转载自：http://blog.csdn.net/wangxiaohu__/article/details/7254598

parse用于从一个字符串中解析出json对象,如

var str = '{"name":"huangxiaojian","age":"23"}'

结果：

JSON.parse(str)

1. age:"23"
2. name:"huangxiaojian"
3. __proto__:Object

stringify()用于从一个对象解析出字符串，如

var a = {a:1,b:2}

JSON.stringify(a)