为什么我的显示是00:00:00啊,帮忙看一下
var WINDOW_WIDTH=1024;
var WINDOW_HEIGHT=768;
var RADIUS=8;//定义小球的半径
var MARGIN_TOP=60;
var MARGIN_LEFT=30;
const endTime=new Date(2014,6,11,18,47,52);
var curShowTimeSeconds=0;
//加载页面
window.onload=function(){
var canvas=document.getElementById("canvas");//获得画布
var context=canvas.getContext("2d");//获得上下文环境
canvas.width=WINDOW_WIDTH;
canvas.height=WINDOW_HEIGHT;
curShowTimeSeconds=getCurrentShowTimeSeconds();//获得当前时间
render(context);//绘制当前的canvas画布
}
function getCurrentShowTimeSeconds(){
var curTime=new Date();//得到当前的时间
var ret=endTime.getTime()-curTime.getTime();
ret=Math.round(ret/1000);
return ret >=0 ? ret : 0;
}
function render(cxt){
var hours=parseInt(curShowTimeSeconds/3600);
var minutes=parseInt((curShowTimeSeconds-hours*3600)/60);//得到的是毫秒数
var seconds=curShowTimeSeconds%60;
renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),cxt);//绘制第一个数字
renderDigit(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hours%10),cxt);//绘制第二个数字
renderDigit(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,cxt);//冒号
renderDigit(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(minutes/10),cxt);//绘制分钟
renderDigit(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt);//绘制分钟个位数
renderDigit(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,cxt);//冒号
renderDigit(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(seconds/10),cxt);//绘制秒钟
renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(seconds%10),cxt);
}
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();
}
}