出不来效果 注释部分为小球特效 加了以后倒计时效果也出不来了

var WINDOW_WIDTH=1024;

var WINDOW_HEIGHT=768;

var RADIUS=8;

var MARGIN_LEFT=30;

var MARGIN_TOP=60;

const endTime=new Date(2016,2,17,18,47,52);

var curShowTimeSeconds=0;

/* var balls=[];

const colors = ["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"]; */

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();

},

60

);

}

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(nextHours/10)!=parseInt(curHours/10)){

addBalls(MARGIN_LEFT+0,MARGIN_TOP,parseInt(curHours/10));

}

if(parseInt(nextHours%10)!=parseInt(curHours%10)){

addBalls(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curHours%10));

}

if(parseInt(nextMinutes/10)!=parseInt(curMinutes/10)){

addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10));

}

if(parseInt(nextMinutes%10)!=parseInt(curMinutes%10)){

addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10));

}

if(parseInt(nextSeconds/10)!=parseInt(curSeconds/10)){

addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10));

} 

if(parseInt(nextSeconds%10)!=parseInt(curSeconds%10)){

addBalls(MARGIN_LEFT+93*(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].vy;

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(x,y,num){

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,ball[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();

}

}

}

}