本文实例为大家分享了JavaScript实现限时抢购，供大家参考，具体代码如下
运行效果图：
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>限时抢购倒计时</title>
<style type="text/css">
body{
text-align: center;
}
#first{
color:#ff7300;
font-size:30px;
margin-left:10px;
}
</style>
<script type="text/javascript">
window.onload=function(){
setInterval(changTime, 500);
function changTime(){
document.getElementById("time").innerHTML=getTime();
changeStyle();
}
function gR()
{
return Math.floor(Math.random()*16);
}
function changeStyle(){
var ele=document.getElementById("time");
var size=Math.random()*40;
ele.style.fontSize=((size+10)+"px");
var mc=new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F");
ele.style.color="#"+mc[gR()]+mc[gR()]+mc[gR()]+mc[gR()]+mc[gR()]+mc[gR()];
}
function getTime(){
var now=new Date().getTime();
var end=new Date("2015/12/20").getTime();
var temp=end-now;
if(temp<=0)
{
document.getElementById("first").innerHTML="抢购活动已结束！！！！！";
return "";
}else
{
var temp2=new Date();
temp2.setTime(temp);
var sec=Math.floor((temp)/1000%60);
var min=Math.floor(temp/(60*1000)%60);
var hou=Math.floor(temp/(60*60*1000)%24);
var day=Math.floor(temp/(24*60*60*1000));
return day+"天 "+hou+"小时 "+min+"分钟 "+sec+"秒";
}
}
};
</script>
</head>
<body>
<br/><br/><br/><br/><br/>
<span id="first">距离限时抢购还有 </span>
<span id="time"></span>
</body>
</html>
希望本文实例希望对大家学习javascript程序设计有所帮助。