番外篇：ES6（二）解构表达式

1、数组解构

<script>
        //定义一个数组
        let arr = [1,2,3];
        //分别赋给a b c
        let a = arr[0]
        let b = arr[1]
        let c = arr[2]
        console.log("常规写法:",a,b,c);

        //用let定义一个数组，直接赋值
        let [x,y,z] = arr;
        console.log("解构表达式写法:",x,y,z);
    </script>

2、对象解构

<script>
        //定义一个对象
        let person = {
            name:"tom",
            age:34,
            language:["java","vue"]
        }
        //常规赋值
        let a_name = person.name;
        let a_age = person.age;
        let a_language = person.language;
        console.log(a_name,a_age,a_language);

        //解构赋值 必须要和person对象的key同名，可以用name:b_name这种方式替换key
        const {name:b_name,age,language} = person;
        console.log(b_name,age,language);
    </script>