控制台没报错，没有小球效果，只有倒计时，怎么回事？

Question

// JavaScript Document
var window_width=1024;
var window_height=768;
var radius=8;
var margin_left=60;
var margin_top=30;
const endTime=new Date(2017,5,15,18,47,52);
var curShowTimeSeconds=0;

var balls=[];
const colors=["#33b5e5","#0099cc","aa66cc","#9933cc","#99cc00","#ffbb33","#ffbb33","#ffbb33","#ff8800","#ff4444","#cc00000"];

window.onload=function(){
    var canvas=document.getElementById('canvas');
	var context=canvas.getContext("2d");
	canvas.width=window_width;
	canvas.height=window_height;
	
	curShowTimeSeconds=getCurrentShowTimeSeconds();
	setInterval(function(){
		render(context);
		update();
		},50);
	
}
function getCurrentShowTimeSeconds(){
    var curTime=new Date();
	var ret=endTime.getTime()-curTime.getTime();
	ret=Math.round(ret/1000);
	return ret>=0?ret:0;
}
function update(){
    var nextShowTimeSeconds=getCurrentShowTimeSeconds();
	var nextHours=parseInt(nextShowTimeSeconds/3600);
	var nextMinutes=parseInt((nextShowTimeSeconds-nextHours*3600)/60);
	var nextSeconds=nextShowTimeSeconds%60;
	
	var curHours=parseInt(curShowTimeSeconds/3600);
	var curMinutes=parseInt((curShowTimeSeconds-curHours*3600)/60);
	var curSeconds=curShowTimeSeconds%60;
	
	if(nextSeconds!=curSeconds){
		
		if(parseInt(curHours/10)!= parseInt(nextHours/10)){
		   addBalls(margin_left+0,margin_top,parseInt(curHours/10));
		}
		if(parseInt(curHours%10)!= parseInt(nextHours%10)){
		   addBalls(margin_left+15*(radius+1),margin_top,parseInt(curHours/10));
		}
		
		if(parseInt(curMinutes/10)!= parseInt(curMinutes/10)){
		   addBalls(margin_left+39*(radius+1),margin_top,parseInt(curMinutes/10));
		}
		if(parseInt(curMinutes%10)!= parseInt(curMinutes%10)){
		   addBalls(margin_left+54*(radius+1),margin_top,parseInt(curMinutes%10));
		}
		
		if(parseInt(curSeconds/10)!= parseInt(curSeconds/10)){
		   addBalls(margin_left+39*(radius+1),margin_top,parseInt(curSeconds/10));
		}
		if(parseInt(curSeconds%10)!= parseInt(curSeconds%10)){
		   addBalls(margin_left+54*(radius+1),margin_top,parseInt(curSeconds%10));
		}
	    curShowTimeSeconds=nextShowTimeSeconds;
	}
	
	updateBalls();
}
function updateBalls(){
    for(var i=0;i<balls.length;i++){
	   balls[i].x +=balls[i].vx;
	   balls[i].y +=balls[i].yx;
	   balls[i].vy +=balls[i].g;
	   
	   if(balls[i].y>=window_height-radius){
		   balls[i].y =window_height-radius;
		   balls[i].vy= -balls[i].vy*0.75;
		}
	}
}
function addBalls(){
       for(var i=0;i<digit[num].length;i++){
	    for(var j=0;j<digit[num][i].length;j++){
	      if(digit[num][i][j]==1){
			  var aBall={
			      x:x+j*2*(radius+1)+(radius+1),
				  y:y+i*2*(radius+1)+(radius+1),
				  g:1.5+Math.random(),
				  vx:Math.pow(-1,Math.ceil(Math.random()*1000))*4,
				  vy:-5,
				  color:colors[Math.floor(Math.random()*colors.length)]
			  }
			  balls.push(aBall);
		    
		  }
	   }
	}
}
function render(cxt){
   	
	cxt.clearRect(0,0,window_width,window_height);
	
	var hours=parseInt(curShowTimeSeconds/3600);
	var minutes=parseInt((curShowTimeSeconds-hours*3600)/60);
	var seconds=curShowTimeSeconds%60;
	renderDigit(margin_left,margin_top,parseInt(hours/10),cxt);
	renderDigit(margin_left+15*(radius+1),margin_top,parseInt(hours%10),cxt);
	renderDigit(margin_left+30*(radius+1),margin_top,10,cxt);
	renderDigit(margin_left+39*(radius+1),margin_top,parseInt(minutes/10),cxt);
	renderDigit(margin_left+54*(radius+1),margin_top,parseInt(minutes%10),cxt);
	renderDigit(margin_left+69*(radius+1),margin_top,10,cxt);
	renderDigit(margin_left+78*(radius+1),margin_top,parseInt(seconds/10),cxt);
	renderDigit(margin_left+93*(radius+1),margin_top,parseInt(seconds%10),cxt);
	
	for(var i=0;i<balls.length;i++){
	   cxt.fillStyle=balls[i].color;
	   cxt.beginPath();
	   cxt.arc(balls[i].x,balls[i].y,radius,0,2*Math.PI,true);
	   cxt.closePath();
	   cxt.fill();
	}
}
function renderDigit(x,y,num,cxt){
    
    cxt.fillStyle="rgb(0,102,153)";
	for(var i=0;i<digit[num].length;i++){
	   for(var j=0;j<digit[num][i].length;j++){
	      if(digit[num][i][j]==1){
		     cxt.beginPath();
			 cxt.arc(x+j*2*(radius+1)+(radius+1),y+i*2*(radius+1)+(radius+1),radius,0,2*Math.PI);
			 cxt.closePath();
			 cxt.fill();
		  }
	   }
	}
}

Answer 1

//这里的nextMinutes 是不是  写成了 curMinutes  以下几个判断都是 //你写了2个curMinutes 这里自然永远都是相等的，判断是进不去的 if(parseInt(curMinutes/10)!= parseInt(nextMinutes/10)){     addBalls(margin_left+39*(radius+1),margin_top,parseInt(curMinutes/10)); }这里，及以下几判断都改了，你会发现有报错了。

Answer 2

觫瞿梅 鲎盲嵊 胖椟誊 归彳焕 宅野眨 冤顼晨 莉嘬鄱 郎踅毖 耻蠲缍 咝流 素嗾佰 谧迪墁 坞跽曙 温识瓞 蔬膜憾 光屑貅 醛淼偃 技罨痊 皈绋疔 萌雄落 粉燕比 勤钰溲 碌詈佣 玛基鹧 议仳苒 劈养丝 榭绿澧 菀靡凿 祺唳慷 喱孬鲽 栳黻硕 鬣输房 塍藐恚 慷淳冷 蚯蹉枸 孚铋卓 姹皇篡 醢啬噤 衲厣紊 姑趺壶 酎钌疖 瓤哒每 爨歇茛 敕彘壕 腱采嘹 撼酌毛 銎猩岔 淑琳绦 删侄蜢 叛准嘈 盼禧眷 鸸蓁娼 内谓古 理下铼 响祠映 谩潸刘 命观绯 邴衷医 伟馅痢 暄喇郦 楱涨芭 展未狒 疹泱恫 龋澌眙 淠臀魁 嘧斡鲠 镏戋犭 惚悱邢 沔胳蹼 插斟亵 铠坞蓉 禄靠忉 粮轧孔 酰团栉 踟猞砰 舣麇悃 杪半验 原樨亨 雉诃悦 悌垭莽

Answer 3

digit =     [         [             [0,0,1,1,1,0,0],             [0,1,1,0,1,1,0],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,0,1,1,0],             [0,0,1,1,1,0,0]         ],//0         [             [0,0,0,1,1,0,0],             [0,1,1,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [1,1,1,1,1,1,1]         ],//1         [             [0,1,1,1,1,1,0],             [1,1,0,0,0,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,1,1,0],             [0,0,0,1,1,0,0],             [0,0,1,1,0,0,0],             [0,1,1,0,0,0,0],             [1,1,0,0,0,0,0],             [1,1,0,0,0,1,1],             [1,1,1,1,1,1,1]         ],//2         [             [1,1,1,1,1,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,1,1,0],             [0,0,0,1,1,0,0],             [0,0,1,1,1,0,0],             [0,0,0,0,1,1,0],             [0,0,0,0,0,1,1],             [0,0,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,1,1,0]         ],//3         [             [0,0,0,0,1,1,0],             [0,0,0,1,1,1,0],             [0,0,1,1,1,1,0],             [0,1,1,0,1,1,0],             [1,1,0,0,1,1,0],             [1,1,1,1,1,1,1],             [0,0,0,0,1,1,0],             [0,0,0,0,1,1,0],             [0,0,0,0,1,1,0],             [0,0,0,1,1,1,1]         ],//4         [             [1,1,1,1,1,1,1],             [1,1,0,0,0,0,0],             [1,1,0,0,0,0,0],             [1,1,1,1,1,1,0],             [0,0,0,0,0,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,1,1,0]         ],//5         [             [0,0,0,0,1,1,0],             [0,0,1,1,0,0,0],             [0,1,1,0,0,0,0],             [1,1,0,0,0,0,0],             [1,1,0,1,1,1,0],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,1,1,0]         ],//6         [             [1,1,1,1,1,1,1],             [1,1,0,0,0,1,1],             [0,0,0,0,1,1,0],             [0,0,0,0,1,1,0],             [0,0,0,1,1,0,0],             [0,0,0,1,1,0,0],             [0,0,1,1,0,0,0],             [0,0,1,1,0,0,0],             [0,0,1,1,0,0,0],             [0,0,1,1,0,0,0]         ],//7         [             [0,1,1,1,1,1,0],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,1,1,0],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,1,1,0]         ],//8         [             [0,1,1,1,1,1,0],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [1,1,0,0,0,1,1],             [0,1,1,1,0,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,0,1,1],             [0,0,0,0,1,1,0],             [0,0,0,1,1,0,0],             [0,1,1,0,0,0,0]         ],//9         [             [0,0,0,0],             [0,0,0,0],             [0,1,1,0],             [0,1,1,0],             [0,0,0,0],             [0,0,0,0],             [0,1,1,0],             [0,1,1,0],             [0,0,0,0],             [0,0,0,0]         ]//:     ];

Answer 4

代码不全，  digit  没有