JavaScript获取当前时间向前推三个月的方法示例

更新时间：2020-04-21 00:34:12 作者：startmvc

本文实例讲述了JavaScript获取当前时间向前推三个月的方法。分享给大家供大家参考，具体

本文实例讲述了JavaScript获取当前时间向前推三个月的方法。分享给大家供大家参考，具体如下：


<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test</title>
<script type="text/javascript" language="javascript" >
function get3MonthBefor(){
 var resultDate,year,month,date,hms;
 var currDate = new Date();
 year = currDate.getFullYear();
 month = currDate.getMonth()+1;
 date = currDate.getDate();
 hms = currDate.getHours() + ':' + currDate.getMinutes() + ':' + (currDate.getSeconds() < 10 ? '0'+currDate.getSeconds() : currDate.getSeconds());
 switch(month)
 {
 case 1:
 case 2:
 case 3:
 month += 9;
 year--;
 break;
 default:
 month -= 3;
 break;
 }
 month = (month < 10) ? ('0' + month) : month;
 resultDate = year + '-'+month+'-'+date+' ' + hms;
 return resultDate;
}
document.write(get3MonthBefor());
</script>
</head>
<body>
</body>
</html>

运行效果图如下：