解构赋值

   //  数组结构

        // let ary = [1, 2, 3];

        // let [a, b, c] = ary;

        // console.log(a); //1

        // console.log(b); //2

        // console.log(c); //3

        let ary = [1, 2, 3];

        let [a, b, c, d, e] = ary;

        console.log(a); //1

        console.log(b); //2

        console.log(c); //3

        console.log(d); // undefined

        console.log(e); // undefined

 

 

  // 第二种结构方式 

        let person = {

            name: 'lisi',

            age: 30,

            sex: '男'

        };

        let {

            name: MyName

        } = person;

        console.log(MyName); // lisi