json转成string[需要引用json2.js文件]：

var arr=[{id:'id',name:'Spring'},{id:'id2',name:'Jane'}];

var str=JSON.stringify(arr);

结果："[{id:'id',name:'Spring'},{id:'id2',name:'Jane'}]"

string转化为json:

var str="[{id:'id',name:'Spring'},{id:'id2',name:'Jane'}]";

var json=$.parseJSON(str);

结果：[{id:'id',name:'Spring'},{id:'id2',name:'Jane'}]