Question

var add = function() {
        var total_income = 0;
        for (var i = 0; i < income_amount.length; i++) {
            total_income = total_income + income_amount[i];

        }
        return total_income;
    }
    var balance = add();

我的函数没有返回更新的值，它正在分配当前值，即0，那么我怎样才能得到更新的值

Answer 1

我假设了income_amount，结果我得到了300

 var income_amount=[100,200];
    var add = function() {
            var total_income = 0;
            for (var i = 0; i < income_amount.length; i++) {
                total_income = total_income + income_amount[i];

            }
            console.log(total_income);
            return total_income;
    }
    var balance = add();

您的代码工作正常。希望它有所帮助。

Answer 2

如果我尝试使用您的代码，结果是正确的，请查看this jsFiddle

我初始化了income_amount变量for test：

var income_amount = [1,2,3,4];

如何在不指定任何值的情况下创建全局整数变量？

2 个答案: