你已经知道day = today.getDate();可取得当前的“日”
那你就应该知道today.setDate(day)可设置当前“日”当前日期的前一天就是
day = today.getDate(today.setDate(today.getDate()-1))
注意不能简单的today.getDate()-1
因为可能跨月甚至跨年同理,取年、月要在修改“日”以后进行
那你就应该知道today.setDate(day)可设置当前“日”当前日期的前一天就是
day = today.getDate(today.setDate(today.getDate()-1))
注意不能简单的today.getDate()-1
因为可能跨月甚至跨年同理,取年、月要在修改“日”以后进行
var date = new Date();
date.setDate(date.getDate()-1);
var sDate = date.getFullYear() +"-"+ (date.getMonth()+1) +"-"+ date.getDate();
alert(sDate);
}
var Yday=new Array(2);
Yday[0]=new Array(0,31,28,31,30,31,30,31,31,30,31,30,31);
Yday[1]=new Array(0,31,29,31,30,31,30,31,31,30,31,30,31);
function init(){
var today = new Date();
sYear = today.getYear();
smonth = today.getMonth()+1;
sday = today.getDate();
var yn=0;
if (sYear%400==0 || sYear%100!=0 && sYear%4==0 )
yn=1;
if((smonth==1)&&(sday==1))
{
sYear=sYear-1;
smonth=12;
sday=31; }
else if(sday==1)
{
sday=(yn==1)?Yday[1][smonth-1]:Yday[0][smonth-1]
smonth=smonth-1 }
else
{
sday=sday-1;
}
alert(sYear+"-"+smonth+"-"+sday);
}
init()</script>