JSON.parse() 和JSON.stringify()
1、parse 用于從一個字符串中解析出json 對象。例如
var str='{"name":"aaa","age":"23"}'? 經 JSON.parse(str) 得到：
Object
age:"23"
name:"aaa"
_proto_:Object
ps:單引號寫在{}外，每個屬性都必須雙引號，否則會拋出異常
官網解釋：
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用于從一個對象解析出字符串，例如
var a={a:1,b:2}
經 JSON.stringify(a)得到：
“{“a”:1,"b":2}”
