Question

javascript初学者在这里。我搜索了很长时间的解决方案，但找不到解决方案。如果可以的话，请给出答案。谢谢。

computerSelection函数返回一个值。我想要一个字符串值。当我添加调试器时，它显示computerSelection = ƒ ()。因此，即使(computerSelection === "paper")也不会警告“比赛平局”。

function gamePlay () {       
    let gameSelections = ["rock","paper","scissor"];

    let computerSelection = function () {
        function getRandomSelection() {
            return gameSelections[Math.floor(Math.random() * 3)];
        }
        return getRandomSelection();
    }


    console.log(computerSelection());
    //  when I added debugger; and ran the code in developer options it shows --computerSelection = ƒ ()--. So even if (computerSelection === "paper") it doesn't alert "match draw".

    if (computerSelection === "paper") {
        alert("match draw");
    }
}

gamePlay();

我找到了一种可行的方法。但是，我仍然想了解为什么以前不起作用以及现在为什么起作用。

function gamePlay () {
    let gameSelections = ["rock","paper","scissor"];

    let computerSelection =  function () {
        function getRandomSelection() {
            return gameSelections[Math.floor(Math.random() * 3) ] ;
        }
        return getRandomSelection();
    }

    let computerSelectionStringValue = computerSelection();

    console.log(computerSelectionStringValue);
    //  this time when added debugger in developer options it shows --computerSelectionStringValue = "paper"-- 

    if (computerSelectionStringValue === "paper") {
        alert("match draw");
    }
}

gamePlay();

Answer 1

您对电脑的选择感到困惑。您期望它既是函数又是函数的结果。

这样想您的结果：

let result = computerSelection();

或：

if (computerSelection() == 'rock') { ... }

函数返回值，而不是如何获取字符串值

1 个答案: