已解决问题
/**
* Created by Jack on 2016-11-11.
*/
var WINDOW_WIDTH=1024; //初始化画布的宽度
var WINDOW_HEIGHT=640; //初始化画布的高度
var RADIUS=8; //初始化小球的半径
var MARGIN_TOP=80; //画布距离上边距
var MARGIN_LEFT=30;//画布距离左边距
const endTime=new Date(2016,10,13,12,23,43); //获取当前的时间
var curShowTimeSeconds=0; //初始化当前的毫秒数为零
var balls=[]; //创建一个空数组名为balls的函数
const colors=["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"];
//创建画布
window.onload = function () {
var canvas=document.getElementById("canvas");
var context=canvas.getContext("2d");
canvas.width=WINDOW_WIDTH;
canvas.height=WINDOW_HEIGHT;
curShowTimeSeconds=getCurrentShowTimeSeconds(); //获取当前时间的毫秒数
setInterval(
function(){
render(context);
update();
}
,50);
}
//定义获取当期时间的函数
function getCurrentShowTimeSeconds(){
var curTime=new Date();
var ret=endTime.getTime()-curTime.getTime(); //获取差值
ret=Math.round(ret/1000); //毫秒数换成秒数
return ret>=0?ret:0; //判断差值是否为零
}
//更新时间
function update(){
var nextShowTimeSeconds=getCurrentShowTimeSeconds(); //获取下一时刻的秒数
//获取下一时刻的时、分、秒
var nextHours=parseInt(nextShowTimeSeconds/3600);
var nextMinutes=parseInt((nextShowTimeSeconds-nextHours*3600)/60);
var nextSeconds=parseInt(nextShowTimeSeconds%60);
//获取当前时刻的时、分、秒
var curHours=parseInt(curShowTimeSeconds/3600);
var curMinutes=parseInt((curShowTimeSeconds-curHours*3600)/60);
var curSeconds=parseInt(curShowTimeSeconds%60);
//判断时刻是否改变
if(nextSeconds!=curSeconds){
//绘制时钟位置处十位和个位的小球位置
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));
}
//绘制分钟位置处十位和个位的小球位置
if(parseInt(curMinutes/10)!=parseInt(nextMinutes/10)){
addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10));
}
if(parseInt(curMinutes%10)!=parseInt(nextMinutes%10)){
addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10));
}
//绘制秒钟位置处十位和个位的小球位置
if(parseInt(curSeconds/10)!=parseInt(nextSeconds/10)){
addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10));
}
if(parseInt(curSeconds%10)!=parseInt(nextSeconds%10)){
addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds%10));
}
curShowTimeSeconds=nextShowTimeSeconds;
}
updateBalls();
}
//创建updateBalls函数
function updateBalls(){
for(var i=0;i<balls.length;i++){
balls[i].x+=balls[i].vx; //小球横向的速度
balls[i].y+=balls[i].vy; //小球纵向的速度
balls[i].vy+=balls[i].g; //小球的重力加速度
//判断小球是否到达屏幕低端，使其反弹一段距离
if(balls[i].y>=WINDOW_HEIGHT-RADIUS){
balls[i].y=WINDOW_HEIGHT-RADIUS
balls[i].vy=-balls[i].vy*0.5;
}
}
}
//创建addBalls函数-增加小球
function addBalls(x,y,num){
//遍历整个数组
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){ //判断数组中的位数数字是否为1，为1则加一个小球
//对于小球的位置、速度、颜色给出值
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); //对于所有小球加值
}
}
//绘制时间
function render(cxt){
var hours=parseInt(curShowTimeSeconds/3600);
var minutes=parseInt((curShowTimeSeconds-hours*3600)/60);
var second=parseInt(curShowTimeSeconds%60);
//对于时间分钟秒数的位置绘制
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(second/10),cxt);
renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(second%10),cxt);
//遍历小球为其加入颜色
for(var i=0;i<balls.length;i++){
cxt.fillStyle=balls[i].color;
//绘制路径
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)";
//遍历数组
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){ //判断小球处的位置上数字是否为1
//绘制路径
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();
}
}
