/**
 * javascript日历控件
 */

 function Calendar(options,callback){
    var self = this;
    self.options = $.extend({},defaults,options || {});
    self.targetCls = $(self.options.targetCls);
    if(self.targetCls.length < 1) {return;}
    self.language = self.options.language;
    self.flag = false;
    self.callback = callback;

    self._init();
    self._bindEnv();
    
 };
 $.extend(Calendar.prototype,{
    
    _init: function(){
        var self = this;
        // 先渲染日历面板
        self._renderCalendarPanel();
    },
    _renderCalendarPanel: function(){
        var self = this,
            options = self.options;
        // 如果input输入框有日期的话 
        if(self.targetCls.val().length > 0) {
            self.date = self._dateParse(self.targetCls.val());
        }
        self.date = new Date(self.date);
        if(isNaN(self.date.getFullYear())){
            self.date = new Date();
        }
        var defYear = self.date.getFullYear(),
            defMonth = self.date.getMonth() + 1,
            defDay = self.date.getDate();

        // 定义每月的天数
        self.month_day = new Array(31,28+self._leapYear(defYear),31,30,31,30,31,31,30,31,30,31);

        // 定义每周的日期
        self.date_name_week = self.language.weekList;

        // 定义周末
        var saturday = 6 - options.wdays,
            sunday = (7-options.wdays >= 7) ? 0 : (7-options.wday);
        
        // 创建日历面板dom节点
        var date_pane = $('<div class="cxcalendar"></div>'),
            date_hd = $('<div class="date_hd"></div>').appendTo(date_pane),
            date_table = $('<table class="date_table"></table>').appendTo(date_pane);
        date_hd.html("<a class='date_pre' href='javascript://' rel='prev'>&lt;</a><a class='date_next' href='javascript://' rel='next'>&gt;</a>");
        
        var date_txt = $('<div class="date_txt"></div>').appendTo(date_hd),
            date_set = $('<div class="date_set"></div>').appendTo(date_hd),
            html = "";

        for(var i = options.beginyear; i < options.endyear; i++) {
            html +="<option value='"+i+"'>"+i+"</option>";
        }
        var year_list = $('<select class="year_set"></select>').html(html).appendTo(date_set).val(defYear);
        
        date_set.append(" - ");
        html = '';
        for(var i = 0; i < 12; i++) {
            html += '<option value="'+(i+1)+'">'+self.language.monthList[i]+'</option>';
        }
        var month_list = $('<select class="month_set"></select>').html(html).appendTo(date_set).val(defMonth);
        html = '<thead><tr>';
        // 遍历一周7天
        for(var i = 0; i < 7; i++) {
            html += "<th class='"
            // 周末高亮
            if(i == saturday) {
                html+= " sat";
            }else if(i == sunday) {
                html+= " sun";
            };
            html+="'>";
            html+= (i+options.wday * 1 < 7) ? self.date_name_week[i+options.wday] : self.date_name_week[i+options.wday - 7];
            html+="</th>";
        };
        html +="</tr></thead>";
        html +="<tbody></tbody>";
        date_table.html(html);

        // 面板及背景遮挡层插入到页面中
        date_pane.appendTo("body");

        // 创建遮罩层的目地是：只显示一个日历面板
        var block_bg=$("<div class='cxcalendar_lock'></div>").appendTo("body");
        
        // 赋值 全局
        self.dateTxt = date_txt;
        self.yearList = year_list;
        self.monthList = month_list;
        self.dateTable = date_table;
        self.saturday = saturday;
        self.sunday = sunday;
        self.datePane = date_pane;
        self.blockBg = block_bg;
        self.dateSet = date_set;
        self.defYear = defYear;
        self.defMonth = defMonth;

        // 根据年份 月份来渲染天
        self._renderBody(defYear,defMonth);
    },
    _dayNumOfMonth: function(Year,Month){
        var d = new Date(Year,Month,0);
        return d.getDate();
    },
    /*
     * 渲染日历天数
     * @param {y,m} 年 月
     */
    _renderBody: function(y,m){
        var self = this;
        var options = self.options;
        if(m < 1) {
            y--;
            m = 12;
        }else if(m > 12) {
            y++;
            m = 1;
        }
        var tempM = m,
            cur_m = m;

        m--;  // 月份从0开始的
        var prevMonth = tempM - 1,  //上个月的月份
            prevDay = self._dayNumOfMonth(y,tempM - 1), // 上个月的天数
            nextMonth = tempM + 1,   // 下个月的月份
            nextDay = self._dayNumOfMonth(y,tempM + 1),  //下个月的天数
            curDay = self._dayNumOfMonth(y,tempM);       // 当前月份的天数

        self.month_day[1]=28+self._leapYear(y);  //闰年的话 29天 否则 28天
        var temp_html = "",
            temp_date = new Date(y,m,1);
        var now_date = new Date();
        now_date.setHours(0);
        now_date.setMinutes(0);
        now_date.setSeconds(0);
        
        // 如果输入框有值的话
        if(self.targetCls.val().length > 0) {
            var val_date=self._dateParse(self.targetCls.val())
        }
        val_date=new Date(val_date);
        if(isNaN(val_date.getFullYear())){
            val_date=null;
        };
        // 获取当月的第一天
        var firstDay = temp_date.getDay() - options.wday < 0 ? temp_date.getDay() - options.wday + 7 : temp_date.getDay() - options.wday;
        // 每月所需要的行数
        var monthRows = Math.ceil((firstDay+self.month_day[m]) / 7);
        var td_num,
            day_num,
            diff_now,
            diff_set;
        var disabled;
        for(var i= 0; i < monthRows; i++) {
            temp_html += "<tr>";
            for(var j = 0; j < 7; j++) {
                td_num=i*7+j;
                day_num=td_num-firstDay+1;
                if(day_num<=0) {
                    if(day_num == 0) {
                        day_num = prevDay - day_num
                        text_m = prevMonth
                    }else {
                        day_num = prevDay + day_num;
                        text_m = prevMonth
                    }
                    
                }else if(day_num > self.month_day[m]){
                    day_num = day_num - curDay;
                    text_m = nextMonth
                }else {
                    text_m     = cur_m;
                }
                temp_html+="<td";
                if(typeof(day_num) == 'number') {
                    diff_now=null;
                    diff_set=null;
                    temp_date = new Date(y,m,day_num);

                    if(text_m == cur_m) {
                        diff_now=Date.parse(now_date)-Date.parse(temp_date);
                        diff_set=Date.parse(val_date)-Date.parse(temp_date);
                    }
                    if(cur_m > text_m || cur_m < text_m) {
                        disabled = 'disabled';
                    }else {
                        disabled = "";
                    }
                    temp_html+=(" title='"+y+options.separator+tempM+options.separator+day_num+"' class='num "+disabled+"");

                    // 高亮周末、今天、选中
                    if(diff_set==0){    //选中的时候 增加select 类名
                        temp_html+=" selected";
                    }else if(diff_now==0){
                        temp_html+=" now";   // 当前时间增加now类名
                    }else if(j==self.saturday){
                        temp_html+=" sat";   // 周六增加sat类名
                    }else if(j==self.sunday){
                        temp_html+=" sun";   // 周日增加sun类名
                    };
                    temp_html+=("'");
                };
                temp_html+=(" data-day='"+day_num+"'>"+day_num+"</td>");
            }
            temp_html+="</tr>";
        }
        $(self.dateTable).find("tbody").html(temp_html);
        $(self.dateTxt).html("<span class='y'>"+y+"</span>"+options.language.year+"<span class='m'>"+options.language.monthList[m]+"</span>"+options.language.month);
        $(self.yearList).val(y);
        $(self.monthList).val(m+1);
        
        return this;
    },
    _dateParse: function(date){
        var newdate = date;
        newdate=newdate.replace(/\./g,"/");
        newdate=newdate.replace(/-/g,"/");
        newdate=newdate.replace(/\//g,"/");
        newdate=Date.parse(newdate);
        return newdate;
    },
    /*
     * 判断是否是闰年
     * @param y 年份
     * 1.能被4整除且不能被100整除 2.能被100整除且能被400整除
     */
    _leapYear: function(y) {
        return ((y%4==0 && y%100!=0) || y%400==0) ? 1 : 0;
    },
    _bindEnv: function(){
        var self = this;
        $(self.targetCls).unbind('click').bind('click',function(){
            self.show();
        });

        // 关闭面板事件
        self.blockBg.unbind('click').bind("click",function(){
            self.hide();
        });

        // 点击上一页 下一页事件
        self.datePane.delegate('a','click',function(){
            if(!this.rel){return};
            var _rel = this.rel;
            if(_rel == 'prev') {
                self._renderBody(self.yearList.val(),parseInt(self.monthList.val(),10) -1);    
                return;
            }else if(_rel == 'next') {
                self._renderBody(self.yearList.val(),parseInt(self.monthList.val(),10) +1);
                return;
            }
        });

        // 选择日期事件
        self.datePane.delegate('td','click',function(){
            var _this = $(this);
            if(_this.hasClass('num') && !_this.hasClass('disabled')) {
                self.dateTable.find("td").removeClass("selected");
                _this.addClass("selected");
                var day = _this.attr("data-day");
                self._selectDay(day);
            }
        });
        
        // 显示年月选择
        self.dateTxt.unbind('click').bind("click",function(){
            self.dateTxt.hide();
            self.dateSet.show();
        });

        //更改年月事件
        self.yearList.unbind('change').bind("change",function(){
            self._renderBody(self.yearList.val(),self.monthList.val());
        });
        self.monthList.unbind('change').bind("change",function(){
            self._renderBody(self.yearList.val(),self.monthList.val());
        });
    },
    /* 
     * 选择某一天的时候 把值存入输入框里 且面板隐藏
     * @_selectDay {private}
     */
    _selectDay: function(d) {
        var self = this;
        var year,
            month;
        month = self.monthList.val();
        day = d;
        var options = self.options;
        if(options.type == 'yyyy-mm-dd') {
            month="0" + self.monthList.val();
            day= "0" + d;
            month=month.substr((month.length-2),month.length);
            day=day.substr((day.length-2),day.length);
        }
        self.targetCls.val(self.yearList.val()+options.separator+month+options.separator+day);
        self.hide();

        self.callback && $.isFunction(self.callback) && self.callback(self.yearList.val()+options.separator+month+options.separator+day);
        return this;
    },
    /*
     * 显示日历面板
     * @method  show {public}
     */
    show: function(){
        var self = this;
        if(self.flag) {
            return;
        }
        var doc_w = document.body.clientWidth,
            doc_h = document.body.clientHeight,
            pane_top = self.targetCls.offset().top,
            pane_left = self.targetCls.offset().left,
            obj_w = self.targetCls.outerWidth(),
            obj_h = self.targetCls.outerHeight();
        pane_top= pane_top+obj_h;
        self.datePane.css({"top":pane_top,"left":pane_left}).show();
        self.blockBg.css({width:doc_w,height:doc_h}).show();
        self.flag = true;
        return this;
    },
    /*
     * 清除日期
     * @method clear {public}
     */
    clear: function(){
        var self = this;
        self.targetCls.val('');
        self._renderBody(self.defYear,self.defMonth);
        self.hide();
        return this;
    },
    /*
     * 获取当前选中的日期
     * @method getValue {public}
     * @return val
     */
     getValue: function(){
        var self = this;
        return self.targetCls.val();
     },
    /*
     * 隐藏日历面板
     */
    hide: function(){
        var self = this;
        if(!self.flag) {return;}
        self.datePane.hide();
        self.blockBg.hide();
        self.dateSet.hide();
        self.dateTxt.show();
        self.flag = false;
        return this;
    }
 });

 var defaults = {
    targetCls        :        '',             //渲染日历的class
    beginyear        :        1978,           //开始年份
    endyear          :        2050,           //结束年份
    date             :        new Date(),     // 默认日期
    type             :        "yyyy-mm-dd",      // 日期格式
    separator        :        "-",              // 日期链接符
    wday             :        0,              // 周第一天
    language         :       {
                                year:"年",
                                month:"月",
                                monthList:["1","2","3","4","5","6","7","8","9","10","11","12"],
                                weekList:["日","一","二","三","四","五","六"]}
 };

我是时间控件1：<input name="mydate" type="text" class="input_cxcalendar" readonly style="width:200px;">

$('.input_cxcalendar').each(function(){
    var a = new Calendar({
        targetCls: $(this)
    },function(val){
        console.log(val);
    });
});