function sum(...rest) {
var a=0;
for(var i in rest){
a=a+rest[i];
}
return a;
2020-3-22
for..of循环集合本身的元素;for..in循环的是下标，所以要求rest的和，for..of,循环内是a=a+i,for..in,,循环内是a=a+rest[i]
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陈语自点
function sum(...rest) {
var a=0;
for(var i in rest){
a=a+rest[i];
}
return a;
}
2020-3-22