//获取当前日期

         var myDate = new Date();

         var nowY = myDate.getFullYear();

         var nowM = myDate.getMonth()+1;

         var nowD = myDate.getDate();

         var enddate = nowY+"-"+(nowM<10 ? "0" + nowM : nowM)+"-"+(nowD<10 ? "0"+ nowD : nowD);//当前日期

         //获取三十天前日期

         var lw = new Date(myDate - 1000 * 60 * 60 * 24 * 30);//最后一个数字30可改，30天的意思

         var lastY = lw.getFullYear();

         var lastM = lw.getMonth()+1;

         var lastD = lw.getDate();

         var startdate=lastY+"-"+(lastM<10 ? "0" + lastM : lastM)+"-"+(lastD<10 ? "0"+ lastD : lastD);//三十天之前日期