为什么游戏时间缩短了一半而不是2秒？

Question

我试图用纯Javascript构建游戏作为练习.

游戏目的是在计时器用完之前回答随机数学练习.时间用一个落在某人头上的蛋来表示; 如果你正确地回答了所有的数学练习,你将重新开始,但时间会缩短2秒.

我的问题:在游戏的第1级,时间按预期工作,但是第2级时间缩短了一半.是什么导致这种情况发生？

相关代码:

var gameTime;
//function responsible for starting The game
function StartGame() {  
    ...
    ...
    ...
    checkLevel();
    getNewTime();        
    speed=getNewSpeed();
   dh=setInterval("move(egg)",gameTime);
    ...             
}//End start game

function checkLevel() {

   if(document.getElementById("begginer").checked==true) {
        fillNumbervalue(true);
        gameTime=30;                   
       }
    else  {        
        fillNumbervalue(false); 
          gameTime=60;    
    } //End else   
}//End of checkLevel

function getNewSpeed () {    
    return (distanceBetweenEggToYudale/gameTime); //distanceBetweenEggToYudale=310
}//End function

//if player pass level this function will get down by 2 seconds the time
function getNewTime() {
    for(var i=0;i<levelCount;i++)
              gameTime-=2;
}//end getNewTime

//function responsible for moving The Egg
function move(eggBall) {    
    eggBall.imagePositionY=eggBall.imagePositionY+(gameTime/1000)*speed;  
 //image postion=0 at the beginning
    eggBall.element.style.top=eggBall.imagePositionY+"px";       
   ...
   ...     
}//End move

//when the player push the answer button
function answerValidation() {
        var answers=new Array();        
            for(var i=0;i<result.length;i++)
                answers[i]=document.getElementById("txtAnswer"+(i+1)).value;        

                if(result[0]!=answers[0] || result[1]!=answers[1] || result[2]!=answers[2])                  
                    gameOverScreen();                     
                else 
                {
                   score++;
                   levelCount++;                   
                   init(); //Initial the egg position onload of the body element
                   clearTxtRows();                   
                   gameTime-=2;  

                   StartGame();      
                }//End else  


    }//End anwser validation 

我知道这个问题已经加载了代码,所以如果有人可以提供帮助我真的很感激.

Answer 1

问题是你正在重复使用你的gameTime变量,当你想要做的事情是同时开始并从那里开始减少时.所以你想要一个startGameTime变量.

只有一个gameTime变量:

http://jsfiddle.net/DPTJ3/1/

使用startGameTime变量gameTime在递减之前重新启动值:

http://jsfiddle.net/DPTJ3/

function getNewTime() {
    gameTime = startGameTime;
    for (var i = 0; i < levelCount; i++) {
        gameTime -= 2;
    }
}

function logData() {
    log = document.getElementById('log');
    log.innerHTML += "LEVEL: " + levelCount + "\nGTIME: " + gameTime + "\n\n";
}

var levelCount = 1;
var startGameTime = 60;
var gameTime = 60;

logData();

for (var i = 0; i < 10; i++) {
    levelCount++;
    getNewTime();
    logData();
}

OUTPUT

LEVEL: 1
GTIME: 60

LEVEL: 2
GTIME: 56

LEVEL: 3
GTIME: 54

LEVEL: 4
GTIME: 52

LEVEL: 5
GTIME: 50

LEVEL: 6
GTIME: 48

LEVEL: 7
GTIME: 46

LEVEL: 8
GTIME: 44

LEVEL: 9
GTIME: 42

LEVEL: 10
GTIME: 40

LEVEL: 11
GTIME: 38

编辑

此外,如果您想要精确地减少,您应该考虑到第一级实际上是0而不是getNewTime()函数的事实.如果你注意到,它似乎将第一个减去两个等级.要解决此问题,您可以:

for (var i = 0; i < levelCount - 1; i++) { // Notice the - 1