如何把对象转换成json格式

var obj = {name: "中国", age: 5000};//->普通格式的对象
var jsonObj = {"name": "中国", "age": 5000};//->JSON格式的对象 (只要把普通对象的属性名用""(不能是'')包起来，这样的格式就是我们JSON格式的对象)
var data = [
{name: "", age: ""},
{name: "", age: ""}
];//->普通的
二维数组

var jsonData = [
{"name": "", "age": ""},
{"name": "", "age": ""}
];//->JSON格式的数据

var data = [
{name: "李四", age: 48},
{name: "张三", age: 84}
];

var str = JSON.stringify(data);//->'[{"name":"李四","age":48},{"name":"张三","age":84}]'
console.log(JSON.parse(str));

var str = '[{"name":"李四","age":48},{"name":"张三","age":84}]';
var data = eval("(" + str + ")");//->兼容的话我们使用JSON.parse(str)
console.dir(data);