函数里形参这样写有点看不太懂，求指教

Question

export const selectPlay = function ({commit, state}, {list, index}) {}上面的代码里（{commit, state}, {list, index}），形参为啥是这样写的？大概知道和es6的对象扩展写法有关。可以写一串代码，介绍下吗？谢谢

Answer 1

var a={commit:1,state:2},b={list:3,index:4}

const selectPlay = function ({commit, state}, {list, index}) {

    console.log(commit, state,list, index)

}

selectPlay(a,b) //1,2,3,4