js设置本周 本月 本年

         var SetSearchDate = function (sign, sid, eid) {//sign 标识符区分本周本月本年，sid开始时间id，eid结束时间id
             var now = new Date();
             var nowDayOfWeek = now.getDay();         //今天本周的第几天
             var nowMonth = now.getMonth() + 1;           //当前月
             var nowYear = now.getFullYear();             //当前年

             if (sign == 1)//本周
             {
                 var first_milliseconds =  new Date().getTime() - 1000 * 60 * 60 * 24 * (nowDayOfWeek - 1);
                 var last_milliseconds = first_milliseconds + 1000 * 60 * 60 * 24 * 6;
                 $("#" + sid).val(formatDate(new Date(first_milliseconds)));
                 $("#" + eid).val(formatDate(new Date(last_milliseconds)));
             } else if (sign == 2)//本月
             {
                 var firstdate = nowYear + '-' + nowMonth + '-01';
                 var lastdate = nowYear + '-' + nowMonth + '-' + new Date(nowYear, nowMonth, 0).getDate();
                 $("#" + sid).val(firstdate);
                 $("#" + eid).val(lastdate);
             } else if (sign == 3)//本年
             {
                 $("#" + sid).val(nowYear + '-01' + '-01');
                 $("#" + eid).val(nowYear + '-12' + '-31');
             }
         }