Question

我试图开发一款游戏，但系统并不总是有效（如果你有足够的黄金，它会测试它）。我无法理解它，它有时只能用更大的数字而不是全部。这是代码：

<!--- Game Of War: Ice Age -->

<!DOCTYPE html>
<html>
<head>
    <title>Game Of War: Ice Age</title>
</head>
<h4 id="gold"></h4>
<!-- Gain Gold -->
<img src="file:///C:/Users/Hacker/Pictures/GOW%20-%20Ice%20Age/goldButton.png" height="50" style="border: solid; 5px; black;" width="50" onclick="gainGold()"></img>

<!-- Barracks -->
<img src="file:///C:/Users/Hacker/Pictures/GOW%20-%20Ice%20Age/barracks.png" height="50" style="border: solid; 5px; black;" width="50" onclick="training()"></img>
<body>
<script type="text/javascript">
var gold = 1000000;
var goldPC = 1;

<!-- Troop Training Variables -->
var mammothCost = 5;
var dinosaurCost = 100;
var mammoths = 0;

function gainGold(){
    gold += goldPC;

}

function training(){
    train = prompt("Train Troops!")
    if (train == "Mammoths") {
        alert("Train Mammoths")
        amount = prompt("How Many Mammoths Do You Want To Train?")
        takeaway = mammothCost * amount;
        if (gold - takeaway <= 0){
            alert("You Do Not Have Enough Gold!")
            training()
        }
        mammoths = amount += mammoths

        gold -= takeaway


    }
}

<!-- SetIntervalSettings -->

setInterval(function renderGold (){
    document.getElementById('gold').innerHTML = "Gold: " + gold;
});


</script>

</body>
</html>

Answer 1

我的猜测是prompt()函数返回一个字符串，这会混淆后面的数学运算。通过parseInt()运行结果将返回一个整数。

在自动变量类型转换方面，Javascript变得非常挑剔。

Answer 2

mammoths = amount += mammoths;

所以你把猛犸象分配给金额，猛犸象增加了？你可能想要：

mammoths += +amount;

额外的加号会将它转换为数字（输入是字符串！）所以你可能还想在每个提示之前添加一个+ ...

val=+prompt("this string is converted to number!");

如果没有足够的黄金，你可能想停止执行：

        if (gold - takeaway <= 0){
            alert("You Do Not Have Enough Gold!")
            setTimeout(training);
            return;
        }

setTimeout只是一种造型......

为什么外卖系统不起作用

2 个答案: