JSON.parse() 和JSON.stringify()

1、parse 用于从一个字符串中解析出json 对象。例如

var str='{"name":"aaa","age":"23"}'  经 JSON.parse(str) 得到：

Object

age:"23"

name:"aaa"

_proto_:Object

ps:单引号写在{}外，每个属性都必须双引号，否则会抛出异常

官网解释：

In JSON, they take on these forms:

Anobjectis an unordered set of name/value pairs. An object  begins with{(left brace)and ends  with}(right brace). Each name is followed  by:(colon)and the name/value pairs are  separated by,(comma).

Anarrayis an ordered collection of values. An array begins  with[(left bracket)and ends  with](right bracket). Values are separated  by,(comma).

Avaluecan be astringin double quotes, or anumber,  ortrueorfalseornull, or anobjector  anarray. These structures can be nested.

2、stringify用于从一个对象解析出字符串，例如

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

经 JSON.stringify(a)得到：

“{“a”:1,"b":2}”