console.log(Array.form("red")) // ["r", "e", "d"] 

 const a1 = new Map().set("name","张三").set("age",18)

    console.log(Array.from(a1)) // [["name","张三"], ["age",18] 

 const a1 = [

        {

        name: "小明",

        age: 18,

        gender: "男"

        },

        {

            name: "小明",

            age: 18,

            gender: "男"

        }]

    const a2 = Array.from(a1)

    console.log(a2) 

 function argumentArray() {

        console.log(Array.from(arguments)) // [1, 2, 3, 4]

    }

    argumentArray(1, 2, 3, 4) 

let arrayLike = {

        0: '张三',

        1: '18',

        2: '男',

        3: ['猜猜', '是哪'],

        'length': 4

    }

    let arr = Array.from(arrayLike);

    console.log(arr); 

 Array.of(1, 2, 3, 4) // [1, 2, 3, 4] 

 Array.of(1, 2, 3, 4) // [1, 2, 3, 4] 


 let user = [

        {

            name: "张三",

            age: 18,

            gender: "男"

        },

        {

            name: "李四",

            age: 19,

            gender: "女"

        },

        {

            name: "王五",

            age: 20,

            gender: "女"

        }

    ] 

 console.log(Array.from(user.keys())) // [0, 1, 2] 

 console.log(Array.from(user.values())) 

console.log(Array.from(user.entries())) 

 let newData = {"username": "ys","age": "22","gender":"计科1902","className":"3班","id":6}

    person.splice(1,1,newData) // 这里是替换的使用