ES6剩余参数

ES6提供了剩余参数，用法很简单也很方便，语法就是三个点号，例子如下：

function converCurrency (rate,...amounts){

return amounts.map((amount)=>{rate*amount})

}

const amounts=converCurrency(0.8,10,20,30);

console.log(amounts);

运行结果如下：

把剩余参数以数组的形式保存下来，对象解构中也能应用到，很方便

const player=['jelly',123,5.4,6.7,8.2,9.5]；

const[name,id,score]=player;

console.log(name);

console.log(id);

console.log(score);

const player=['jelly',123,5.4,6.7,8.2,9.5]；

const[name,id,...score]=player;

console.log(name);

console.log(id);

console.log(score);

运行结果：