Question

我在 codecademy 上学习javascript。我提交时，以下程序卡住了。我是新手，所以我找不到这个bug。我下载了 Aptana Studio ，但我不知道如何调试:(。有没有办法跟踪代码？提前感谢。

var slaying = true;
var youHit = Math.random() > 0.5;
var damageThisRound = Math.floor(5 * Math.random());
var totalDamage = 0;

while (slaying) {
    if (youHit) {
        console.log("You hit the dragon.");
        totalDamage += damageThisRound;
        if (totalDamage >= 4) {
            console.log("You've stew the dragon!");
            slaying = false;
        } else {
            youHit = Math.random() > 0.5;
        }
    } else {
        console.log("The dragon defeated you.")
    }
}

Answer 1

根据我的理解。您需要在else部分设置slaying = false，否则程序将被抛入无限循环。

} else {
    slaying = false; //Added here - Breaks the while() condition
    console.log("The dragon defeated you.")
}

简单，当The dragon defeated you.杀戮停止时。（双关语）

对于调试，请使用Firefox内置的Developer tools或Firebug内置的Chrome。两者都使用F12在您选择的浏览器中访问。

Answer 2

是肯定的。如果你使用Chrome，你可以使用内置的Dev Tools或（如果使用Firefox）你可以使用FireBug扩展

Answer 3

var slaying = true;
var youHit = Math.random() > 0.5;
var damageThisRound = Math.floor(5 * Math.random());
var totalDamage = 0;

while (slaying) {
    if (youHit) {
        console.log("You hit the dragon.");
        totalDamage += damageThisRound;
        if (totalDamage >= 4) {
        console.log("You've stew the dragon!");
            slaying = false;
        } else {
        youHit = Math.random() > 0.5;
        }
    } else {
        //add this line
        slaying = false;    
        console.log("The dragon defeated you.")
    }
}

Answer 4

var slaying = true;
var youHit = Math.random() > 0.5;
var damageThisRound = Math.floor(5 * Math.random());
var totalDamage = 0;

while (slaying) {
    if (youHit) {
        console.log("You hit the dragon.");
        totalDamage += damageThisRound;
        if (totalDamage >= 4) {
        console.log("You've stew the dragon!");
            slaying = false;
        } else {
        youHit = Math.random() > 0.5;
        }
    } else {
        console.log("The dragon defeated you.");
        slaying=false;
    }
}

你错过了在别人案件中杀人的错误。所以，如果你不这样做，那就是无限循环。

Answer 5

在else语句后添加false（包含龙击败了你）。喜欢这个

} else {
    console.log("The dragon defeated you.");
    slaying=false;
}

否则，它是一个无限循环，导致一个人的浏览器崩溃。如果它是JAVA或类似的东西，游戏不会停止，但它是JS - 你不能没有结束循环。

javascript：程序卡住了

5 个答案: