JavaScript ...运算符(扩展运算符)以及rest运算符介绍

…运算符

var arr = [1,2,3,4,5,6];
var arr1 = [4,5,6,...arr];
console.log(arr1);//4,5,6,1,2,3,4,5,6

rest运算符

//例1:
var [a, ...arr] = [1,2,3];
console.log(arr);//2, 3

//例2:
function func(...values) {
var sum = 0;
for (var value of values.valueOf()) {
sum = sum + value;
}
return sum;
}

console.log(func(1,2,3));//6