js时间处理

  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
            m = (m<=9) ? "0"+m : m;
        var d = dd.getDate();
            d = (d<=9) ? "0"+d : d;
        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));