js的解构

数组解构

• 左边是右边的模板必须一样

  let [a,b,c] = [1,2,3];

• 如果之多的话…

  let [d,e,...f] = [1,2,3,4,5,6,7,8,9];

• 指定第2个

  [,a,] = [1,2,3];

• 交换值

  [b,a] = [a,b];

对象解构

• 左边是右边的模板必须一样
• 用括号抱住

  ({id,name} = {id:40,name:'nihao'})

参数解构

• 数组传参

  let sum = ([a,b])=>a+b;
  console.log(sum[1,2]);

• 对象传参

  let getName = ({name,email})=>[name,eamil];
  console.log(getName({name:'nihao',email:'a@a.com'}));