为什么效果出不来呢
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 nextTimeHours=parseInt(nextShowTimeSeconds/3600);
var nextTimeMinutes=parseInt((nextShowTimeSeconds-nextTimeHours*3600)/60);
var nextTimeSeconds=parseInt(nextShowTimeSeconds%60);
var curTimeHours=parseInt(curShowTimeSeconds/3600);
var curTimeMinutes=parseInt((curShowTimeSeconds-curTimeHours*3600)/60);
var curTimeSeconds=parseInt(curShowTimeSeconds%60);
if(nextTimeSeconds!=curTimeSeconds){
if(parseInt(nextTimeHours/10)!=parseInt(curTimeHours/10)){
addBalls(MARGIN_LEFT+0,MARGIN_TOP,parseInt(curTimeHours/10));
}
if(parseInt(nextTimeHours%10)!=parseInt(curTimeHours%10)){
addBalls(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curTimeHours%10));
}
if(parseInt(nextTimeMinutes/10)!=parseInt(curTimeMinutes/10)){
addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curTimeMinutes/10));
}
if(parseInt(nextTimeMinutes%10)!=parseInt(curTimeMinutes%10)){
addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curTimeMinutes%10));
}
if(parseInt(nextTimeSeconds/10)!=parseInt(curTimeSeconds/10)){
addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curTimeSeconds/10));
}
if(parseInt(nextTimeSeconds%10)!=parseInt(curTimeSeconds%10)){
addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curTimeSeconds%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 aBalls={
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(aBalls);
}
}
}
}
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=parseInt(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();
}
}
}
}
