JavaScript 战斗模拟器失败答案

【问题标题】：JavaScript Battle Simulator FailingJavaScript 战斗模拟器失败
【发布时间】：2015-07-13 22:39:10
【问题描述】：

我正在尝试制作一个战斗模拟器，在该模拟器中，我使用 JavaScript 中的 prompt() 函数提示用户输入进攻部队、防御部队以及击杀率。当我将代码写入HTML文档进行测试时，它无法提示用户。我确实意识到我现在可以通过使用原型来更好地编写下面的代码，但是这个想法是在完成代码之后才想到的。对于下面代码中的格式怪异，我也深表歉意。我需要帮助调试的代码如下。你能帮我弄清楚代码有什么问题吗？

<!DOCTYPE html>
<html>
<head>
<title> Battle Simulator AMUN </title>
</head>

<body>  

<SCRIPT LANGUAGE="JAVASCRIPT">
    var armyAttackingIn;
    var armyAttackingNumber;
    var armyDefendingIn;
    var armyDefendingNumber;
    //declares variables
    armyAttackingIn=prompt("How many forces are in the attacking army?");
    armyAttackingNumber = parseInt(armyAttackingIn);
    armyDefendingIn=prompt("How many forces are in the defending army?");
    armyDefendingNumber = parseInt(armyDefendingIn);
    //gets the number of armies

    var morale;
    //makes morale a factor
    var moraleYesOrNo = prompt("Shall morale be a factor? Y/N");
    if (moraleYesOrNo=="Y"||moraleYesOrNo=="Yes"||moraleYesOrNo="yes") {
    morale = ((defender/attacker)*3+.3)*100;
     if (morale>=100) {
        morale = 100;
     }
    }
    else {
    morale = 100;
    };
    //defines what morale is.
    var killRateDefense = parseInt(prompt("Insert the defensive kill rate. Default is 70.","70");)/100;
    var killRateOffense = parseInt(prompt("Insert the offensive kill rate. Default is 60.","60");)/100;
    var battle = function() {
//defines the kill rate
    var armyAttackingLeft = armyAttackingNumber - (armyDefendingNumber*killRateDefense*(100/morale));
    var defendingArmyLeft = armyDefendingNumber - (armyAttackingNumber*killRateOffense*(morale/100));
//gets armies left
    if(armyAttackingLeft<0) {
        armyAttackingLeft = 0
    };
    if(armyDefendingLeft<0) {
        armyDefendinigLeft = 0
    };
    //makes the minimum troops left 0
    }
battle();
document.write("The attacking army was " + armyAttackingIn + "men strong" <br>");
document.write("The defending army was " + armyDefendingIn + "men strong" <br>");
document.write("The morale was " + morale + "/%" <br>);
document.write("The defensive kill rate was " + killRateDefensive + "/% and the offensive kill rate was " + killRateOffensive + "/%" <br>);
document.write("There were " + (armyAttackingNumber-armyAttackingLeft) + " attackers killed" <br>);
document.write("There were " + (armyDefendingNumber-armyDefendingLeft) + " defenders killed" <br>);
document.write("There are " + armyAttackingLeft + " attacking soldiers that survived and there are " + armyDefendingLeft + " defending soldiers that survived.");
if (armyAttackingLeft == 0) {
    document.write(<br>"The attacking force was demolished. Everyone died.");
};
if (armyDefendingLeft == 0) {
    document.write(<br>"The defending force was demolished. Everyone died.");
};
//writes the document


</SCRIPT>
</body>
</html>

【问题讨论】：

document.write(<br> 给出语法错误。顺便说一句，除非有必要，否则永远不要使用document.write。
这里有不少错误。 moraleYesOrNo="yes" 在开始时不是 javascript 中的有效逻辑语句。
我不知道这是否是您唯一的问题，但它应该是 document.write("<br> The... 而不是您现在所拥有的。通过在浏览器中按 F12 打开其开发者工具，可以找到许多其他常见问题。

标签： javascript html prompt

【解决方案1】：

您以前使用过浏览器的 Javascript 控制台吗？您可能会发现它是一个有用的调试工具。

仅使用prompt() 调用的明显错误：您的代码中有一个额外的分号，这导致了“参数列表后未捕获的语法错误：缺少)”错误。

正确的行是：

parseInt(prompt("Insert the defensive kill rate. Default is 70.","70"))/100;

您的 if 语句缺少“=”。您当前正在执行分配而不是检查，并且它正在引发错误。应该是：

if (moraleYesOrNo=="Y"||moraleYesOrNo=="Yes"||moraleYesOrNo=="yes") {

您的一个变量中还有一个错字：

armyDefendinigLeft = 0

【讨论】：