Question

我正在尝试从变量中获取while循环的乘积：

var firstOne = 1;
var timesBy = 0;
var result1 = function()
{
  while (timesBy < 10) {
firstOne * timesBy;
timesBy = timesBy +1; 
}
    };
console.log(result1);

我的控制台只记录[功能]这是有道理的，因为我要求它给我result1，但当然我想要的是函数里面的while循环的产品。我知道这很简单，但我刚开始。感谢

Answer 1

您需要从函数返回一个值，并调用函数本身：

var firstOne = 1;
var timesBy = 0;
var result1 = function () {
    while (timesBy < 10) {
        firstOne * timesBy; // does nothing, but I left it regardless.
        timesBy = timesBy + 1;
    }
    return timesBy; // returns the variable back to the calling-context
};
console.log(result1, result1());
//                    ^-- calls the function

JS Fiddle demo

在评论中，有关此功能的预期结果的更新：

var firstOne = 1;
var result1 = function () {
    for (var i = 1; i < 11; i++){
        firstOne = firstOne * i;
    }
    return firstOne;
};
console.log(result1());

JS Fiddle demo

Answer 2

你很亲密：

var firstOne = 1;
var timesBy = 0;
var result1 = function () {
    while (timesBy < 10) {
        timesBy++;
        firstOne = firstOne * timesBy;
    }
    return firstOne;
};
alert(result1());

FIDDLE

如何在变量中返回while循环的乘积

2 个答案: