javascript - 如何在变量中返回 while 循环的结果

Question

我正在尝试从变量中获取 while 循环的结果:

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 [Function]，这很有意义，因为我要求它给我 result1，但当然我想要的是函数内部 while 循环的产物。我知道这很容易，但我才刚刚开始。谢谢

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 .

随着更新，在评论中，关于这个功能的预期结果:

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

JS Fiddle demo .