json

---

定义json:
var json = {"name": "vicky", "age": 21}

转换：
var str = JSON.stringify(json);
json = JSON.parse(str);

两种赋值：
json.sex = "male";
json["id"] = 3;

判断字段是否存在:
console.log(json.hasOwnProperty("id"));

删除字段：
delete json.id;
delete json["id"];