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//括号内的d1 d2 是传入的两个时间
d1 = new Date(d1.getFullYear(), d1.getMonth(), d1.getDate(), d1.getHours());
d2 = new Date(d2.getFullYear(), d2.getMonth(), d2.getDate(), d2.getHours());
var t1 = d1.getTime(), t2 = d2.getTime();
diff = Math.floor(t2 / 3600000) - Math.floor(t1 / 3600000);
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>无标题页</title>
<script type = "text/javascript" language= "javascript" >
function timeV(d1,d2){
//括号内的d1 d2 是传入的两个时间
d1 = new Date(d1.getFullYear(), d1.getMonth(), d1.getDate(), d1.getHours());
d2 = new Date(d2.getFullYear(), d2.getMonth(), d2.getDate(), d2.getHours());
var t1 = d1.getTime(), t2 = d2.getTime();
diff = Math.floor(t2 / 3600000) - Math.floor(t1 / 3600000);
alert(diff);//--23
alert('t2:'+t2/3600000);//--356583
alert('t1:'+t1/3600000);//--356560
var vv = (t2 - t1)/3600000;
alert('VV:'+vv);//--23
}
</script>
</head>
<body>
<input type="button" name="t" value="timeV" onclick="timeV(new Date(2010,8,5,0,0,0),new Date(2010,8,5,23,59,59));" />
</body>
</html>