如何使用Javascript获取距今n天前的日期

本篇文章是对使用Javascript获取距今n天前日期的实现代码进行了详细的分析介绍需要的朋友参考下复制代码 代码如下:

function Test(day) {
var today = new Date();
var beforMilliseconds = todaygetTime() * * * day;
var beforday = new Date();
befordaysetTime(beforMilliseconds);
var strYear = befordaygetFullYear();
var strDay = befordaygetDate();
var strMonth = befordaygetMonth() + ;
if (strMonth < ) {
strMonth = "" + strMonth;
}
var strYesterday = strYear + "" + strMonth + "" + strDay;
alert(strYesterday);
}