复制代码 代码如下:

function Test(day) {

var today = new Date();

var beforMilliseconds = today.getTime() - 1000 * 3600 * 24 * day;

var beforday = new Date();

beforday.setTime(beforMilliseconds);

var strYear = beforday.getFullYear();

var strDay = beforday.getDate();

var strMonth = beforday.getMonth() + 1;

if (strMonth < 10) {

strMonth = "0" + strMonth;

}

var strYesterday = strYear + "-" + strMonth + "-" + strDay;

alert(strYesterday);

}