js中的json

1、概念

json是一种格式化的字符串，规定必须使用双引号""

2、序列化

将对象序列化成json格式的字符串

var xiaohua = {
        name:"xiaohua",
        age:23,
        gender:"female",
        height:"1.65",
        skills:["javascript","css","java"]
}
console.log(JSON.stringify(xiaohua));//返回{"name":"xiaohua","age":23,"gender":"female","height":"1.65","skills":["javascript","css","java"]}

加上参数以后，会按缩进输出

console.log(JSON.stringify(xiaohua,null,"    "))
/*返回结果
{
    "name": "xiaohua",
    "age": 23,
    "gender": "female",
    "height": "1.65",
    "skills": [
        "javascript",
        "css",
        "java"
    ]
}*/

第二的参数表示要筛选的对象键值，如果只想输出指定的属性，可以传入数组

console.log(JSON.stringify(xiaohua,["name","skills"],"    "))
/*
返回结果
{
    "name": "xiaohua",
    "skills": [
        "javascript",
        "css",
        "java"
    ]
}
*/

3、反序列化

将json格式的字符串变成一个js对象

var s = '{"name":"xiaohua","skills":["javascript","css","java"]}'
console.log(JSON.parse(s));//返回Object {name: "xiaohua", skills:["javascript","css","java"]}