es6-解构赋值和默认值

// 写法一function m1({x = 0, y = 0} = {}) {  return [x, y];}// 写法二function m2({x, y} = { x: 0, y: 0 }) {  return [x, y];}// console.log(m1());// console.log(m2());console.log(m1({x:1}));//[1,0]console.log(m2({x:1}));//[1,undefined]

首先设置默认值，然后解构赋值