一个js写的日历（代码部分网摘）

特意贴出这段代码，因为它的代码简洁和清晰，觉得不错，供大家分享。
×××××××函数定义部分

<script type="text/javascript"> 
var $ = function (id) { 
return "string" == typeof id ? document.getElementById(id) : id; 
}; 
var Class = { 
create: function() { 
return function() { 
this.initialize.apply(this, arguments); 
} 
} 
} 
var Extend = function(destination, source) { 
for (var property in source) { 
destination[property] = source[property]; 
} 
return destination; 
} 
var Calendar = Class.create(); 
Calendar.prototype = { 
initialize: function(container, options) { 
this.Container = $(container);//容器(table结构) 
this.Days = [];//日期对象列表 
this.SetOptions(options); 
this.Year = this.options.Year || new Date().getFullYear(); 
this.Month = this.options.Month || new Date().getMonth() + 1; 
this.SelectDay = this.options.SelectDay ? new Date(this.options.SelectDay) : null; 
this.onSelectDay = this.options.onSelectDay; 
this.onToday = this.options.onToday; 
this.onFinish = this.options.onFinish; 
this.Draw(); 
}, 
//设置默认属性 
SetOptions: function(options) { 
this.options = {//默认值 
Year: 0,//显示年 
Month: 0,//显示月 
SelectDay: null,//选择日期 
onSelectDay: function(){},//在选择日期触发 
onToday: function(){},//在当天日期触发 
onFinish: function(){}//日历画完后触发 
}; 
Extend(this.options, options || {}); 
}, 
//当前月 
NowMonth: function() { 
this.PreDraw(new Date()); 
}, 
//上一月 
PreMonth: function() { 
this.PreDraw(new Date(this.Year, this.Month - 2, 1)); 
}, 
//下一月 
NextMonth: function() { 
this.PreDraw(new Date(this.Year, this.Month, 1)); 
}, 
//上一年 
PreYear: function() { 
this.PreDraw(new Date(this.Year - 1, this.Month - 1, 1)); 
}, 
//下一年 
NextYear: function() { 
this.PreDraw(new Date(this.Year + 1, this.Month - 1, 1)); 
}, 
//根据日期画日历 
PreDraw: function(date) { 
//再设置属性 
this.Year = date.getFullYear(); this.Month = date.getMonth() + 1; 
//重新画日历 
this.Draw(); 
}, 
//画日历 
Draw: function() { 
//用来保存日期列表 
var arr = []; 
//用当月第一天在一周中的日期值作为当月离第一天的天数 
for(var i = 1, firstDay = new Date(this.Year, this.Month - 1, 1).getDay(); i <= firstDay; i++){ arr.push(0); } 
//用当月最后一天在一个月中的日期值作为当月的天数 
for(var i = 1, monthDay = new Date(this.Year, this.Month, 0).getDate(); i <= monthDay; i++){ arr.push(i); } 
//清空原来的日期对象列表 
this.Days = []; 
//插入日期 
var frag = document.createDocumentFragment(); 
while(arr.length){ 
//每个星期插入一个tr 
var row = document.createElement("tr"); 
//每个星期有7天 
for(var i = 1; i <= 7; i++){ 
var cell = document.createElement("td"); cell.innerHTML = " "; 
if(arr.length){ 
var d = arr.shift(); 
if(d){ 
cell.innerHTML = d; 
this.Days[d] = cell; 
var on = new Date(this.Year, this.Month - 1, d); 
//判断是否今日 
this.IsSame(on, new Date()) && this.onToday(cell); 
//判断是否选择日期 
this.SelectDay && this.IsSame(on, this.SelectDay) && this.onSelectDay(cell); 
} 
} 
row.appendChild(cell); 
} 
frag.appendChild(row); 
} 
//先清空内容再插入(ie的table不能用innerHTML) 
while(this.Container.hasChildNodes()){ this.Container.removeChild(this.Container.firstChild); } 
this.Container.appendChild(frag); 
//附加程序 
this.onFinish(); 
}, 
//判断是否同一日 
IsSame: function(d1, d2) { 
return (d1.getFullYear() == d2.getFullYear() && d1.getMonth() == d2.getMonth() && d1.getDate() == d2.getDate()); 
} 
} 
</script>

××××××××样式表的定义

<style type="text/css"> 
.Calendar { 
font-family:Verdana; 
font-size:12px; 
background-color:#e0ecf9; 
text-align:center; 
width:400px; 
height:180px; 
padding:10px; 
line-height:1.5em; 
} 
.Calendar a{ 
color:#1e5494; 
} 
.Calendar table{ 
width:100%; 
border:0; 
} 
.Calendar table thead{color:#acacac;} 
.Calendar table td { 
font-size: 11px; 
padding:1px; 
} 
#idCalendarPre{ 
cursor:pointer; 
float:left; 
padding-right:5px; 
} 
#idCalendarNext{ 
cursor:pointer; 
float:right; 
padding-right:5px; 
} 
#idCalendar td.onToday { 
font-weight:bold; 
color:#C60; 
} 
#idCalendar td.onSelect { 
font-weight:bold; 
} 
#buttonposition{ 
margin-left: 10%; 
} 
</style>

***********下面是应用的主体部分

<div class="Calendar"> 
<div id="idCalendarPre"><<</div> 
<div id="idCalendarNext">>></div> 
<span id="idCalendarYear"></span>年 <span id="idCalendarMonth"></span>月 
<table cellspacing="0"> 
<thead> 
<tr> 
<td>日</td> 
<td>一</td> 
<td>二</td> 
<td>三</td> 
<td>四</td> 
<td>五</td> 
<td>六</td> 
</tr> 
</thead> 
<tbody id="idCalendar"> 
</tbody> 
</table> 
</div> 
<div id="buttonposition" ><!-- 通过id获取样式 --> 
<input id="idCalendarPreYear" type="button" class="bt" value="上一年" /> 
<input id="idCalendarNow" type="button" class="bt" value="当前月" /> 
<input id="idCalendarNextYear" type="button" class="bt" value="下一年" /> 
</div> 
<script language="JavaScript"> 
var cale = new Calendar("idCalendar", { 
onToday: function(o){ o.className = "onToday"; }, 
onFinish: function(){ 
$("idCalendarYear").innerHTML = this.Year; $("idCalendarMonth").innerHTML = this.Month; 
} 
}); 
$("idCalendarPre").onclick = function(){ cale.PreMonth(); } 
$("idCalendarNext").onclick = function(){ cale.NextMonth(); } 
$("idCalendarPreYear").onclick = function(){ cale.PreYear(); } 
$("idCalendarNextYear").onclick = function(){ cale.NextYear(); } 
$("idCalendarNow").onclick = function(){ cale.NowMonth(); } 
</script> 
</div>