javascript - 更有效地添加 JavaScript 变量？

Question

如果我有两个总和变量和单个变量。有没有更简单的方法来获得总和？

例子：

var first_one = 5;
var first_two = 5;

var second_one = 5;
var second_two = 5;

var firstTotal = first_one + first_two;
var secondTotal = second_one + second_two;

var total = firstTotal + secondTotal;
return total;

Answer 1

创建一个名为sum()

function sum(val1, val2) {
    return val1 + val2;
}

叫它

var firstTotal = sum(first_one, first_two);
var secondTotal = sum(second_one, second_two);

var total = sum(firstTotal, secondTotal);

Answer 2

function sum(a,b){
      return a+b;
}    
var firstTotal = sum(first_one, first_two);