实现效果：

主页代码：

 <script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.date_input.js"></script>
<link rel="stylesheet" href="date_input.css" type="text/css">
<script type="text/javascript">$($.date_input.initialize);</script><form action="#"><p><input type="text" name="date"class="date_input"></p>
</form>

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L=document.body,F=document.createElement("div"),H,G,N,I,M,E,J=L.style.marginTop,K='<div style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"><div></div></div><table style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;" cellpadding="0" cellspacing="0"><tr><td></td></tr></table>';M={position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"};for(E in 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DateInput = (function($) { //Localise the $ functionfunctionDateInput(el, opts) {if (typeof(opts) != "object") opts ={};$.extend(this, DateInput.DEFAULT_OPTS, opts);this.input =$(el);this.bindMethodsToObj("show", "hide", "hideIfClickOutside", "keydownHandler", "selectDate");this.build();this.selectDate();this.hide();
};
DateInput.DEFAULT_OPTS={month_names: ["一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"],short_month_names: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"],short_day_names: ["周日", "周一", "周二", "周三", "周四", "周五", "周六"],start_of_week:0};
DateInput.prototype={build:function() {var monthNav = $('<p class="month_nav">' +'<span class="button prev" title="[Page-Up]">&#171;</span>' +' <span class="month_name"></span> ' +'<span class="button next" title="[Page-Down]">&#187;</span>' +'</p>');this.monthNameSpan = $(".month_name", monthNav);$(".prev", monthNav).click(this.bindToObj(function() { this.moveMonthBy(-1); }));$(".next", monthNav).click(this.bindToObj(function() { this.moveMonthBy(1); }));var yearNav = $('<p class="year_nav">' +'<span class="button prev" title="[Ctrl+Page-Up]">&#171;</span>' +' <span class="year_name"></span> ' +'<span class="button next" title="[Ctrl+Page-Down]">&#187;</span>' +'</p>');this.yearNameSpan = $(".year_name", yearNav);$(".prev", yearNav).click(this.bindToObj(function() { this.moveMonthBy(-12); }));$(".next", yearNav).click(this.bindToObj(function() { this.moveMonthBy(12); }));var nav = $('<div class="nav"></div>').append(monthNav, yearNav);var tableShell = "<table><thead><tr>";$(this.adjustDays(this.short_day_names)).each(function() {tableShell+= "<th>" + this + "</th>";});tableShell+= "</tr></thead><tbody></tbody></table>";this.dateSelector = this.rootLayers = $('<div class="date_selector"></div>').append(nav, tableShell).insertAfter(this.input);if ($.browser.msie && $.browser.version < 7) {//The ieframe is a hack which works around an IE <= 6 bug where absolutely positioned elements//appear behind select boxes. Putting an iframe over the top of the select box prevents this.this.ieframe = $('<iframe class="date_selector_ieframe" frameborder="0" src="#"></iframe>').insertBefore(this.dateSelector);this.rootLayers = this.rootLayers.add(this.ieframe);//IE 6 only does :hover on A elements$(".button", nav).mouseover(function() { $(this).addClass("hover") });$(".button", nav).mouseout(function() { $(this).removeClass("hover") });};this.tbody = $("tbody", this.dateSelector);this.input.change(this.bindToObj(function() { this.selectDate(); }));this.selectDate();},selectMonth:function(date) {var newMonth = new Date(date.getFullYear(), date.getMonth(), 1);if (!this.currentMonth || !(this.currentMonth.getFullYear() == newMonth.getFullYear() &&this.currentMonth.getMonth() ==newMonth.getMonth())) {//We have moved to a different month and so need to re-draw the tablethis.currentMonth =newMonth;//Work out the range of days we will drawvar rangeStart = this.rangeStart(date), rangeEnd = this.rangeEnd(date);var numDays = this.daysBetween(rangeStart, rangeEnd);var dayCells = "";//Draw each of the daysfor (var i = 0; i <= numDays; i++) {var currentDay = new Date(rangeStart.getFullYear(), rangeStart.getMonth(), rangeStart.getDate() + i, 12, 00);if (this.isFirstDayOfWeek(currentDay)) dayCells += "<tr>";if (currentDay.getMonth() ==date.getMonth()) {dayCells+= '<td class="selectable_day" date="' + this.dateToString(currentDay) + '">' + currentDay.getDate() + '</td>';}else{dayCells+= '<td class="unselected_month" date="' + this.dateToString(currentDay) + '">' + currentDay.getDate() + '</td>';};if (this.isLastDayOfWeek(currentDay)) dayCells += "</tr>";};this.tbody.empty().append(dayCells);//Write the month and year in the headerthis.monthNameSpan.empty().append(this.monthName(date));this.yearNameSpan.empty().append(this.currentMonth.getFullYear());$(".selectable_day", this.tbody).click(this.bindToObj(function(event) {this.changeInput($(event.target).attr("date"));}));$("td[date=" + this.dateToString(new Date()) + "]", this.tbody).addClass("today");$("td.selectable_day", this.tbody).mouseover(function() { $(this).addClass("hover") });$("td.selectable_day", this.tbody).mouseout(function() { $(this).removeClass("hover") });};$('.selected', this.tbody).removeClass("selected");$('td[date=' + this.selectedDateString + ']', this.tbody).addClass("selected");},//Select a particular date. If the date is not specified it is read from the input. If no date is//found then the current date is selected. The selectMonth() function is responsible for actually//selecting a particular date.selectDate: function(date) {if (typeof(date) == "undefined") {date= this.stringToDate(this.input.val());};if (!date) date = newDate();this.selectedDate =date;this.selectedDateString = this.dateToString(this.selectedDate);this.selectMonth(this.selectedDate);},//Write a date string to the input and hide. Trigger the change event so we know to update the//selectedDate.changeInput: function(dateString) {this.input.val(dateString).change();this.hide();},show:function() {this.rootLayers.css("display", "block");$([window, document.body]).click(this.hideIfClickOutside);this.input.unbind("focus", this.show);$(document.body).keydown(this.keydownHandler);this.setPosition();},hide:function() {this.rootLayers.css("display", "none");$([window, document.body]).unbind("click", this.hideIfClickOutside);this.input.focus(this.show);$(document.body).unbind("keydown", this.keydownHandler);},//We should hide the date selector if a click event happens outside of ithideIfClickOutside: function(event) {if (event.target != this.input[0] && !this.insideSelector(event)) {this.hide();};},//Returns true if the given event occurred inside the date selectorinsideSelector: function(event) {var offset = this.dateSelector.position();offset.right= offset.left + this.dateSelector.outerWidth();offset.bottom= offset.top + this.dateSelector.outerHeight();return event.pageY < offset.bottom &&event.pageY> offset.top &&event.pageX< offset.right &&event.pageX>offset.left;},//Respond to various different keyboard eventskeydownHandler: function(event) {switch(event.keyCode){case 9: //tabcase 27: //escthis.hide();return;break;case 13: //enterthis.changeInput(this.selectedDateString);break;case 33: //page upthis.moveDateMonthBy(event.ctrlKey ? -12 : -1);break;case 34: //page downthis.moveDateMonthBy(event.ctrlKey ? 12 : 1);break;case 38: //upthis.moveDateBy(-7);break;case 40: //downthis.moveDateBy(7);break;case 37: //leftthis.moveDateBy(-1);break;case 39: //rightthis.moveDateBy(1);break;default:return;}event.preventDefault();},stringToDate:function(string) {varmatches;if (matches = string.match(/^(\d{1,2}) ([^\s]+) (\d{4,4})$/)) {return new Date(matches[3], this.shortMonthNum(matches[2]), matches[1], 12, 00);}else{return null;};},dateToString:function(date) {return date.getFullYear()  + "-" + this.short_month_names[date.getMonth()]  + "-" +date.getDate()  ;},setPosition:function() {var offset = this.input.offset();this.rootLayers.css({top: offset.top+ this.input.outerHeight(),left: offset.left});if (this.ieframe) {this.ieframe.css({width:this.dateSelector.outerWidth(),height:this.dateSelector.outerHeight()});};},//Move the currently selected date by a particular number of daysmoveDateBy: function(amount) {var newDate = new Date(this.selectedDate.getFullYear(), this.selectedDate.getMonth(), this.selectedDate.getDate() +amount);this.selectDate(newDate);},//Move the month of the currently selected date by a particular number of months. If we are moving//to a month which does not have enough days to represent the current day-of-month, then we//default to the last day of the month.moveDateMonthBy: function(amount) {var newDate = new Date(this.selectedDate.getFullYear(), this.selectedDate.getMonth() + amount, this.selectedDate.getDate());if (newDate.getMonth() == this.selectedDate.getMonth() + amount + 1) {//We have moved too far. For instance 31st March + 1 month = 1st May, not 30th AprilnewDate.setDate(0);};this.selectDate(newDate);},//Move the currently displayed month by a certain amount. This does *not* move the currently//selected date, so we end up viewing a month with no visibly selected date.moveMonthBy: function(amount) {var newMonth = new Date(this.currentMonth.getFullYear(), this.currentMonth.getMonth() + amount, this.currentMonth.getDate());this.selectMonth(newMonth);},monthName:function(date) {return this.month_names[date.getMonth()];},//A hack to make "this" refer to this object instance when inside the given functionbindToObj: function(fn) {var self = this;return function() { returnfn.apply(self, arguments) };},//See abovebindMethodsToObj: function() {for (var i = 0; i < arguments.length; i++) {this[arguments[i]] = this.bindToObj(this[arguments[i]]);};},//Finds out the array index of a particular value in that arrayindexFor: function(array, value) {for (var i = 0; i < array.length; i++) {if (value == array[i]) returni;};},//Finds the number of a given month namemonthNum: function(month_name) {return this.indexFor(this.month_names, month_name);},//Finds the number of a given short month nameshortMonthNum: function(month_name) {return this.indexFor(this.short_month_names, month_name);},//Finds the number of a given day nameshortDayNum: function(day_name) {return this.indexFor(this.short_day_names, day_name);},//Works out the number of days between two datesdaysBetween: function(start, end) {start=Date.UTC(start.getFullYear(), start.getMonth(), start.getDate());end=Date.UTC(end.getFullYear(), end.getMonth(), end.getDate());return (end - start) / 86400000;},/*changeDayTo: Given a date, move along the date line in the given direction until we reach thedesired day of week.The maths is a bit complex, here's an explanation.Think of a continuous repeating number line like:.. 5 6 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1 ..We are essentially trying to find the difference between two numberson the line in one direction (dictated by the sign of direction variable).Unfortunately Javascript's modulo operator works such that -5 % 7 = -5,instead of -5 % 7 = 2, so we need to only work with the positives.To find the difference between 1 and 4, going backwards, we can treat 1as (1 + 7) = 8, so the different is |8 - 4| = 4. If we don't cross the boundary between 0 and 6, for instance to find the backwards differencebetween 5 and 2, |(5 + 7) - 2| = |12 - 2| = 10. And 10 % 7 = 3.Going forwards, to find the difference between 4 and 1, we again treat 1as (1 + 7) = 8, and the difference is |4 - 8| = 4. If we don't cross theboundary, the difference between 2 and 5 is |2 - (5 + 7)| = |2 - 12| = 10.And 10 % 7 = 3.Once we have the positive difference in either direction represented as aabsolute value, we can multiply it by the direction variable to get the differencein the desired direction.We can condense the two methods into a single equation:backwardsDifference = direction * (|(currentDayNum + 7) - dayOfWeek| % 7)= direction * (|currentDayNum - dayOfWeek + 7|  % 7)forwardsDifference = direction * (|currentDayNum - (dayOfWeek + 7)| % 7)= direction * (|currentDayNum - dayOfWeek - 7| % 7)(The two equations now differ only by the +/- 7)difference = direction * (|currentDayNum - dayOfWeek - (direction * 7)| % 7)*/changeDayTo:function(dayOfWeek, date, direction) {var difference = direction * (Math.abs(date.getDay() - dayOfWeek - (direction * 7)) % 7);return new Date(date.getFullYear(), date.getMonth(), date.getDate() +difference);},//Given a date, return the day at the start of the week *before* this monthrangeStart: function(date) {return this.changeDayTo(this.start_of_week, new Date(date.getFullYear(), date.getMonth()), -1);},//Given a date, return the day at the end of the week *after* this monthrangeEnd: function(date) {return this.changeDayTo((this.start_of_week - 1) % 7, new Date(date.getFullYear(), date.getMonth() + 1, 0), 1);},//Is the given date the first day of the week?isFirstDayOfWeek: function(date) {return date.getDay() == this.start_of_week;},//Is the given date the last day of the week?isLastDayOfWeek: function(date) {return date.getDay() == (this.start_of_week - 1) % 7;},//Adjust a given array of day names to begin with the configured start-of-weekadjustDays: function(days) {var newDays =[];for (var i = 0; i < days.length; i++) {newDays[i]= days[(i + this.start_of_week) % 7];};returnnewDays;}
};$.fn.date_input= function(opts) {return this.each(function() { new DateInput(this, opts); });
};
$.date_input= { initialize: function(opts) {$("input.date_input").date_input(opts);
} };returnDateInput;
})(jQuery);//End localisation of the $ function

/*Some resets for compatibility with existing CSS*/.date_selector, .date_selector *{width:auto;height:auto;border:none;background:none;margin:0;padding:0;text-align:left;text-decoration:none;
}.date_selector{background:#F2F2F2;border:1px solid #bbb;padding:5px;margin:-1px 0 0 0;position:absolute;z-index:100000;display:none;
}.date_selector_ieframe{position:absolute;z-index:99999;display:none;
}.date_selector .nav{width:17.5em; /*7 * 2.5em*/}.date_selector .month_nav, .date_selector .year_nav{margin:0 0 3px 0;padding:0;display:block;position:relative;text-align:center;}.date_selector .month_nav{float:left;width:55%;}.date_selector .year_nav{float:right;width:35%;margin-right:-8px; /*Compensates for cell borders*/}.date_selector .month_name, .date_selector .year_name{font-weight:bold;line-height:20px;}.date_selector .button{display:block;position:absolute;top:0;width:18px;height:18px;line-height:17px;font-weight:bold;color:#003C78;text-align:center;font-size:120%;overflow:hidden;border:1px solid #F2F2F2;}.date_selector .button:hover, .date_selector .button.hover{background:none;color:#003C78;cursor:pointer;border-color:#ccc;}.date_selector .prev{left:0;}.date_selector .next{right:0;}.date_selector table{border-spacing:0;border-collapse:collapse;clear:both;}.date_selector th, .date_selector td{width:2.5em;height:2em;padding:0;text-align:center;color:black;}.date_selector td{border:1px solid #ccc;line-height:2em;text-align:center;white-space:nowrap;color:#003C78;background:white;}.date_selector td.today{background:#FFFEB3;}.date_selector td.unselected_month{color:#ccc;}.date_selector td.selectable_day{cursor:pointer;}.date_selector td.selected{background:#D8DFE5;font-weight:bold;}.date_selector td.selectable_day:hover, .date_selector td.selectable_day.hover{background:#003C78;color:white;}