js 获取YYYY-MM-DD形式的今天日期和昨天日期

var newdate = null;

function getToDay(){

var now = new Date();

var nowYear = now.getFullYear();

var nowMonth = now.getMonth();

var nowDate = now.getDate();

newdate = new Date(nowYear,nowMonth,nowDate);

nowMonth = doHandleMonth(nowMonth + 1);

nowDate = doHandleMonth(nowDate);

return nowYear+"-"+nowMonth+"-"+nowDate;

}

function doHandleMonth(month){

if(month.toString().length == 1){

month = "0" + month;

}

return month;

}

function getYesterDay(){

var newtimems=newdate.getTime()-(24*60*60*1000);

var yesd = new Date(newtimems);

var yesYear = yesd.getFullYear();

var yesMonth = yesd.getMonth();

var yesDate = yesd.getDate();

yesMonth = doHandleMonth(yesMonth + 1);

yesDate = doHandleMonth(yesDate);

return yesYear+"-"+yesMonth+"-"+yesDate;

}

alert("今天时间是:::" + getToDay());

alert("昨天时间是:::" + getYesterDay());