arguments用法

es5

function a (){
    console.log(arguments)
}
a(1,2,3,4,5)
结果=> [1,2,3,4,5]

function a (x,...arguments){
    console.log(arguments)
}
a(1,2,3,4,5)

结果=> [2,3,4,5]

es6箭头函数

const a => (...arguments){
    console.log(arguments)
}