"use strict"; var xiaoming = { name: "小明", age: 14, gender: true, height: 1.65, grade: null, "middle-school": ""W3C" Middle School", skills: ["JavaScript", "Java", "Python", "Lisp"] }; var s = JSON.stringify(xiaoming); console.log(s);

以上输出如下：

{"name":"小明","age":14,"gender":true,"height":1.65,"grade":null,"middle-school":"岳阳新闻网"W3C" Middle School","skills":["JavaScript","Java","Python","Lisp"]}

可以加上参数，让输出好看一些：

JSON.stringify(xiaoming, null, " ");

输出结果如下：

{ "name": "小明", "age": 14, "gender": true, "height": 1.65, "grade": null, "middle-school": ""W3C" Middle School", "skills": [ "JavaScript", "Java", "Python", "Lisp" ] }

第二个参数用于控制如何筛选对象的键值，如果我们只想输出指定的属性，可以传入Array：

JSON.stringify(xiaoming, ["name", "skills"], " ");

输出结果如下：

{ "name": "小明", "skills": [ "JavaScript", "Java", "Python", "Lisp" ] }

还可以传入一个函数，这样对象的每个键值对都会被函数先处理：

function convert(key, value) { if (typeof value === "string") { return value.toUpperCase(); } return value; } JSON.stringify(xiaoming, convert, " ");

上面的代码把所有属性值都变成大写：

{ "name": "小明", "age": 14, "gender": true, "height": 1.65, "grade": null, "middle-school": ""W3C" MIDDLE SCHOOL", "skills": [ "JAVASCRIPT", "JAVA", "PYTHON", "LISP" ] }

如果我们还想要精确控制如何序列化对象，可以给xiaoming定义一个toJSON()的方法，直接返回JSON应该序列化的数据：

var xiaoming = { name: "小明", age: 14, gender: true, height: 1.65, grade: null, "middle-school": ""W3C" Middle School", skills: ["JavaScript", "Java", "Python", "Lisp"], toJSON: function () { return { // 只输出name和age，并且改变了key： "Name": this.name, "Age": this.age }; } }; JSON.stringify(xiaoming); // "{"Name":"小明","Age":14}"

对于一个JSON格式的字符串，我们直接用JSON.parse()把它变成一个JavaScript对象：

JSON博尔塔拉新闻网.parse("[1,2,3,true]"); // [1, 2, 3, true] JSON.parse("{"name":"小明","age":14}"); // Object {name: "小明", age: 14} JSON.parse("true"); // true JSON.parse("123.45"); // 123.45

JSON.parse()还可以接收一个函数，用来转换解析出的属性：