ES6 变量的解构赋值

ES6 变量的解构赋值
ES6 允许按照一定模式，从数组和对象中提取值，对变量进行赋值，这被称为解构

1、数组的解构赋值

<script type="text/javascript">
    let arr1=[11,22,33];
    let [a,b,c]=arr1;//直接对a、b、c赋值
    console.log(a,b,c);//11 22 33
    let [,,d]=arr1;
    console.log(d);
</script>

2、对象的解构赋值

<script type="text/javascript">
    let obj = {username:'rdb',password:'123456'};
    let {username,password}  =obj;
    console.log(username,password);//变量名必须和属性名相同
</script>