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');
            }
        }