前言

datepicker輸出民國年，網路上google一下，果真大家都有自己一套方法，我參考幾種選出這樣一個方法， 大家參考看看，如有什麼意見歡迎討論^^

                var old_generateMonthYearHeader = $.datepicker._generateMonthYearHeader;
                var old_get = $.datepicker._get;
                var old_CloseFn = $.datepicker._updateDatepicker;
                $.extend($.datepicker, {
                    _generateMonthYearHeader:function (a,b,c,d,e,f,g,h) {
                        var htmlYearMonth = old_generateMonthYearHeader.apply(this, [a, b, c, d, e, f, g, h]);
                        if ($(htmlYearMonth).find(".ui-datepicker-year").length > 0) {
                            htmlYearMonth = $(htmlYearMonth).find(".ui-datepicker-year").find("option").each(function (i, e) {
                                if (Number(e.value) - 1911 > 0) $(e).text(Number(e.innerText) - 1911);
                            }).end().end().get(0).outerHTML;
                        }
                        return htmlYearMonth;
                    },
                    _get:function (a, b) {
                        a.selectedYear = a.selectedYear - 1911 < 0 ? a.selectedYear + 1911 : a.selectedYear;
                        a.drawYear = a.drawYear - 1911 < 0 ? a.drawYear + 1911 : a.drawYear;
                        a.curreatYear = a.curreatYear - 1911 < 0 ? a.curreatYear + 1911 : a.curreatYear;
                        return old_get.apply(this, [a, b]);
                    },
                    _updateDatepicker:function (inst) {
                        old_CloseFn.call(this, inst);
                        $(this).datepicker("widget").find(".ui-datepicker-buttonpane").children(":last")
                               .click(function (e) {
                                    inst.input.val("");
                                });
                    },
                    _setDateDatepicker: function (a, b) {
                        if (a = this._getInst(a)) { this._setDate(a, b); this._updateDatepicker(a); this._updateAlternate(a) }
                    },
                    _widgetDatepicker: function () {
                        return this.dpDiv
                    }

                });
                
                $("#demo1").datepicker({
                    yearSuffix: "", //將年改為空白
                    changeYear: true, //手動修改年
                    changeMonth: true, //手動修改月
                    showWeek: true, //顯示第幾周
                    firstDay: 1, //0為星期天
                    showOtherMonths: true, //在本月中顯示其他月份
                    selectOtherMonths: true, //可以在本月中選擇其他月份
                    showButtonPanel: true, //顯示bottom bar
                    closeText: '清除', //將離開改為清除
                    appendText: "yyy-mm-dd",
                    dateFormat: "yy-mm-dd",
                    onSelect: function (dateText, inst) {
                        var dateFormate = inst.settings.dateFormat == null ? "yy/mm/dd" : inst.settings.dateFormat; //取出格式文字
                        var reM = /m+/g;
                        var reD = /d+/g;
                        var objDate = { y: inst.selectedYear - 1911 < 0 ? inst.selectedYear : inst.selectedYear - 1911,
                            m: String(inst.selectedMonth).length != 1 ? inst.selectedMonth + 1 : "0" + String(inst.selectedMonth + 1),
                            d: String(inst.selectedDay).length != 1 ? inst.selectedDay : "0" + String(inst.selectedDay)
                        };
                        $.each(objDate, function (k, v) {
                            var re = new RegExp(k + "+");
                            dateFormate = dateFormate.replace(re, v);
                        });
                        inst.input.val(dateFormate);
                    }
                });
            });