<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
</head>
<body>
<button onClick="btnCount_Click()">计算相差天数</button>
<script language="JavaScript">
function btnCount_Click(){
s1 = "12/13/2018"
s2 = "12/19/2018"
alert(DateDiff(s1,s2))
}
//计算天数差的函数，通用
function DateDiff(sDate1, sDate2){ //sDate1和sDate2是2002-12-18格式
var aDate, oDate1, oDate2, iDays
aDate = sDate1.split("/")
oDate1 = new Date(aDate[0] + - + aDate[1] + - + aDate[2]) //转换为12-18-2002格式
aDate = sDate2.split("/")
oDate2 = new Date(aDate[0] + - + aDate[1] + - + aDate[2])
iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 /24) //把相差的毫秒数转换为天数
return iDays
}
</script>
