麻烦大家帮我看看哪里出错了，谢谢！
var WINDOW_WIDTH = 1024;
var WINDOW_HEIGHT = 768;
var RADIUS = 8;
var MARGIN_TOP = 60;
var MARGIN_LEFT = 30;
const endTime=new Date("2018/06/04 20:47:52");
var curShowTimeSeconds=0;
var balls = [];
const colors =["#FFCC00", "#FFCC00", "#CC0033", "#990066", "#990066", "#009966", "#339999", "#669999", "#663366","#336633"];
window.onload = function(){
var canvas = document.getElementById('canvas');
var context = canvas.getContext("2d");
canvas.width = WINDOW_WIDTH;
canvas.height = WINDOW_HEIGHT;
curShowTimeSeconds=getCurrentShowTimeSeconds();
// render(context);
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){
curShowTimeSeconds = nextShowTimeSeconds;
if( parseInt(curHours/10) != parseInt(nextHours/10)){
addBalls(MARGIN_LEFT + 0,MARGIN_TOP,parseInt(curHours/10) );
}
if( parseInt(curHours%10) != parseInt(nextMinutes%10)){
addBalls(MARGIN_LEFT + 15*(RADIUS+1),MARGIN_TOP,parseInt(curHours/10) );
}
if( parseInt(curMinutes/10) != parseInt(nextMinutes/10)){
addBalls(MARGIN_LEFT + 39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10) );
}
if( parseInt(curMinutes%10) != parseInt(nextHours%10)){
addBalls(MARGIN_LEFT + 54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10) );
}
if( parseInt(curSeconds/10) != parseInt(nextSeconds/10)){
addBalls(MARGIN_LEFT + 78*(RADIUS+1),MARGIN_TOP,parseInt(nextSeconds/10) );
}
if( parseInt(curSeconds%10) != parseInt(nextSeconds%10)){
addBalls(MARGIN_LEFT + 93*(RADIUS+1),MARGIN_TOP,parseInt(nextSeconds%10) );
}
}
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,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();
}
}
