使用JS实现倒计时功能(http://www.cnblogs.com/dollnet)

使用JS实现倒计时功能

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<TITLE>倒计时</TITLE>
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<META NAME="Generator" CONTENT="EditPlus">
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<META NAME="Author" CONTENT="">
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<META NAME="Keywords" CONTENT="">
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<META NAME="Description" CONTENT="">
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</HEAD>
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<BODY>
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<div id="TimeCounter" style="border:1px solid black;margin:1px;padding:2px;170px"></div>
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<SCRIPT language=javascript>
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<!--
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function show_date_time(){
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window.setTimeout("show_date_time()", 1000);
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target=new Date(2007,9,19,10,13,0);
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today=new Date();
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timeold=(target.getTime()-today.getTime());
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sectimeold=timeold/1000
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secondsold=Math.floor(sectimeold);
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msPerDay=24*60*60*1000
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e_daysold=timeold/msPerDay
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daysold=Math.floor(e_daysold);
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e_hrsold=(e_daysold-daysold)*24;
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hrsold=Math.floor(e_hrsold);
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e_minsold=(e_hrsold-hrsold)*60;
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minsold=Math.floor((e_hrsold-hrsold)*60);
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seconds=Math.floor((e_minsold-minsold)*60);
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if (daysold<0) {
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document.getElementById("TimeCounter").innerHTML="逾期,倒计时已经失效";
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}
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else{
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if (daysold<10) {daysold="0"+daysold}
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if (daysold<100) {daysold="0"+daysold}
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if (hrsold<10) {hrsold="0"+hrsold}
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if (minsold<10) {minsold="0"+minsold}
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if (seconds<10) {seconds="0"+seconds}
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if (daysold<3) {
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document.getElementById("TimeCounter").innerHTML="<font color=red>"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒</font>";
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}
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else
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document.getElementById("TimeCounter").innerHTML=daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒";
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}
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}
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show_date_time();
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//-->
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</SCRIPT></div>
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</BODY>
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</HTML>
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