JS 实现倒计时

使用JS实现倒计时功能

 1 <! DOCTYPE HTML PUBLIC  " -//W3C//DTD HTML 4.0 Transitional//EN " >
 2 < HTML >
 3 < HEAD >
 4 < TITLE > 倒计时 </ TITLE >
 5 < META NAME = " Generator "  CONTENT = " EditPlus " >
 6 < META NAME = " Author "  CONTENT = "" >
 7 < META NAME = " Keywords "  CONTENT = "" >
 8 < META NAME = " Description "  CONTENT = "" >
 9 </ HEAD >
10
11 < BODY >
12   < div id = " TimeCounter "  style = " border:1px solid black;margin:1px;padding:2px;width:170px " ></ div >
13 < SCRIPT language = javascript >
14 <!--
15 function show_date_time() {
16 window.setTimeout("show_date_time()", 1000);
17 target=new Date(2007,9,19,10,13,0);
18 today=new Date();
19 timeold=(target.getTime()-today.getTime());
20 
21 sectimeold=timeold/1000
22 secondsold=Math.floor(sectimeold);
23 msPerDay=24*60*60*1000
24 e_daysold=timeold/msPerDay
25 daysold=Math.floor(e_daysold);
26 e_hrsold=(e_daysold-daysold)*24;
27 hrsold=Math.floor(e_hrsold);
28 e_minsold=(e_hrsold-hrsold)*60;
29 minsold=Math.floor((e_hrsold-hrsold)*60);
30 seconds=Math.floor((e_minsold-minsold)*60);
31 
32  if (daysold<0) {
33 document.getElementById("TimeCounter").innerHTML="逾期,倒计时已经失效";
34}
35 else{
36 if (daysold<10) {daysold="0"+daysold}
37 if (daysold<100) {daysold="0"+daysold}
38 if (hrsold<10) {hrsold="0"+hrsold}
39 if (minsold<10) {minsold="0"+minsold}
40 if (seconds<10) {seconds="0"+seconds}
41 if (daysold<3) {
42  document.getElementById("TimeCounter").innerHTML="<font color=red>"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒</font>";
43}
44 else
45  document.getElementById("TimeCounter").innerHTML=daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒";
46}
47}
48 show_date_time();
49 // -->
50 </ SCRIPT ></ div >
51 </ BODY >
52 </ HTML >
53
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