js数据类型：
字符串、数字、布尔、数组、对象、Null、Undefined
js Object
var data = {
"name":"yfs",
"age":28,
"boy":true,
"language":["chinese", "english"],
"address":{
"provice":"shanxi",
"city":"xian"
}
};JSON.stringify();
var jsonString = JSON.stringify(data);
console.log(jsonString);
console.log(typeof(jsonString));//结果：
{"name":"yfs","age":28,"boy":true,"language":["chinese","english"],"address":{"p
rovice":"shanxi","city":"xian"}}//类型：stringvar a = '{"name":"yfs","age":28,"boy":true,"language":["chinese","english"],"address":{"p
rovice":"shanxi","city":"xian"}}';JSON.parse();
var jsObject = JSON.parse(jsonString);console.log(jsObject);console.log(typeof(jsObject));//结果：{ name: 'yfs',
age: 28,
boy: true,
language: [ 'chinese', 'english' ],
address: { provice: 'shanxi', city: 'xian' } } //类型：object
