加上判断时分秒有无变化、添加彩色小球的代码之后，倒计时就不动了？

Question

为什么我写单独一个小球跳动就可以显示，写多个小球之后，加上判断时分秒有无变化、添加彩色小球的代码之后，倒计时就不动了？我用NetBeans写的。function update(){        var nextShowTimeSeconds=getCurrentShowTimeSeconds();  //下一个变化的时间        var nextHours = parseInt( nextShowTimeSeconds / 3600);    var nextMinutes = parseInt( (nextShowTimeSeconds - nextHours * 3600)/60 );    var nextSeconds = nextShowTimeSeconds % 60;        var curHours = parseInt( curShowTimeSeconds / 3600); //当前时间    var curMinutes = parseInt( (curShowTimeSeconds - curHours * 3600)/60 );    var curSeconds = curShowTimeSeconds % 60;        if(nextSeconds!==curSeconds){                //加入以下if之后时间静止不刷新        if(parseInt(curHours/10)!==parseInt(nextHours/10)){   //对小时的变化判断            addBalls(MARGIN_LEFT+0,MARGIN_TOP,parseInt(curHours/10));        }        if(parseInt(curHours%10)!==parseInt(nextHours%10)){            addBalls(MARGIN_LEFT+15*(R+1),MARGIN_TOP,parseInt(curHours%10));        }                if(parseInt(curMinutes/10)!==parseInt(nextMinutes/10)){//对分钟的变化判断            addBalls(MARGIN_LEFT+39*(R+1),MARGIN_TOP,parseInt(curMinutes/10));        }        if(parseInt(curMinutes%10)!==parseInt(nextMinutes%10)){            addBalls(MARGIN_LEFT+54*(R+1),MARGIN_TOP,parseInt(curMinutes%10));        }               if( parseInt(curSeconds/10) !== parseInt(nextSeconds/10) ){            addBalls( MARGIN_LEFT + 78*(R+1) , MARGIN_TOP , parseInt(curSeconds/10) );        }        if( parseInt(curSeconds%10) !== parseInt(nextSeconds%10) ){            addBalls( MARGIN_LEFT + 93*(R+1) , MARGIN_TOP , parseInt(nextSeconds%10) );        }        if( parseInt(curSeconds%10) !== parseInt(nextSeconds%10) ){            addBalls( MARGIN_LEFT + 93*(R+1) , MARGIN_TOP , parseInt(nextSeconds%10) );                    }                  curShowTimeSeconds=nextShowTimeSeconds;      }     updateBalls();}