js简单获取今天、明天、后天、前天、昨天等时间

function getDateStr(addDayCount) {
    var dd = new Date();
    dd.setDate(dd.getDate() + addDayCount); //获取AddDayCount天后的日期 
    var y = dd.getFullYear();
    var m = dd.getMonth() + 1; //获取当前月份的日期 
    var d = dd.getDate();
    return y + "-" + m + "-" + d;
}
document.write("前天：" + getDateStr(-2));
document.write("<br />昨天：" + getDateStr(-1));
document.write("<br />今天：" + getDateStr(0));
document.write("<br />明天：" + getDateStr(1));
document.write("<br />后天：" + getDateStr(2));
document.write("<br />大后天：" + getDateStr(3));