https://www.bilibili.com/video/av77733273?p=41

文章目录

# 对象 to JSON

let hd = {
    title: '后盾人' ,
    url: 'houdunren.com',
    teacher: {
        name: '向军大叔'
    }
}
let json = JSON.stringify(hd , ['title','url'],2) ; 
console.log(json) ; 


let hd = {
    title: '后盾人' ,
    url: 'houdunren.com',
    teacher: {
        name: '向军大叔'
    }
}
let json = JSON.stringify(hd , null,2) ; 
console.log(json) ;

# 数组

let arr = ['后盾人','hdcms.com'] ; 
let json = JSON.stringify(arr , ['title','url'],2) ; 
console.log(json) ; 


let arr = ['后盾人','hdcms.com'] ; 
let json = JSON.stringify(arr , null ,2) ; 
console.log(json) ; 
let r = JSON.parse(json);
console.log(r)

# 自定义 toJSON

let hd = {
    title: '后盾人' ,
    url: 'houdunren.com',
    teacher: {
        name: '向军大叔'
    }, 
    toJSON: function() {
        return {
            title: this.title, 
            teacher: this.teacher.name 
        }
    }
}
let json = JSON.stringify(hd , null,2) ; 
console.log(json) ;


<mark>toJSON: 可以看成 stringify 第二个参数</mark>

解析

let hd = {
    title: '后盾人' ,
    url: 'houdunren.com',
    teacher: {
        name: '向军大叔'
    }, 
    toJSON: function() {
        return {
            title: this.title, 
            teacher: this.teacher.name 
        }
    }
}
let json = JSON.stringify(hd,null,2) ; 
console.log(json) ; 

let obj = JSON.parse(json , (key,value) => {
    if(key == 'title') {
        value = `[后盾]-${value}`;
    }
    return value ; 
}) ; 
console.log(obj.title) ;