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js获取日期:前天、昨天、今天、明天、后天

2013-12-12 17:08 656 查看
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>js获取日期:前天、昨天、今天、明天、后天 </title>
</head>
<body>
<script language="JavaScript" type="text/javascript">

function getDay(day){
var today = new Date();

var targetday_milliseconds=today.getTime() + 1000*60*60*24*day;

today.setTime(targetday_milliseconds); //注意,这行是关键代码

var tYear = today.getFullYear();
var tMonth = today.getMonth();
var tDate = today.getDate();
tMonth = doHandleMonth(tMonth + 1);
tDate = doHandleMonth(tDate);
return tYear+"-"+tMonth+"-"+tDate;
}
function doHandleMonth(month){
var m = month;
if(month.toString().length == 1){
m = "0" + month;
}
return m;
}

document.write("前天:"+getDay(-2));
document.write("<br />昨天:"+getDay(-1));
document.write("<br />今天:"+getDay(0));
document.write("<br />明天:"+getDay(1));
document.write("<br />后天:"+getDay(2));
document.write("<br />大后天:"+getDay(3));

</script>

</body>
</html>
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