<script>
var time=30
function daoshu()
{
setTimeout(time--,60000);
text.innerHTML=time;
}
</script>
<body onload="daoshu">
<div id=text></div>
</body>
var time=30
function daoshu()
{
setTimeout(time--,60000);
text.innerHTML=time;
}
</script>
<body onload="daoshu">
<div id=text></div>
</body>
var time=30;
var x;
function daoshu()
{
if(time>0){x=setTimeout(time--,60000);text.innerHTML=time;}
else{
clearTimeout(x);
}
}
</script>
<body onload="daoshu">
<div id=text></div>
</body>
var time=30
function daoshu()
{
text.innerHTML=--time;
if(time>0)setTimeout(daoshu,1000*60);
}
</script>
<body onload="daoshu()">
<div id=text></div>
</body>
var time=29
var sec=60
function daoshu()
{
text.innerHTML=time+":"+sec;
sec--;
if(sec==0) {time--;sec=60;}
if(time>0)setTimeout(daoshu,1000);
}
</script>
<body onload="daoshu()">
<div id=text></div>
</body>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
var time=30
var sec=0
function daoshu()
{
if(sec<10)text.innerHTML=time+":0"+sec;
else
text.innerHTML=time+":"+sec; if(sec==0){time--;sec=60;}
sec--;
if(time>0)setTimeout(daoshu,1000);
}
</script>
</HEAD><BODY onload="daoshu()">
<div id=text></div>
</BODY>
</HTML>这个试过了。