两年前写过一个日历,可是兼容性不好. 这次重新写了一次.
兼容多种浏览器
了解了不少东东，特别是对于W3C标准化．
如　FF和IE　对box模型的理解不同
box.style{width:100;border 1px;}
ie理解　为　box.width = 100
ff 理解　为 box.width = 100 + 1*2 = 102
可以使用这种方法使两种浏览器都可以正常浏览
box.style{width:100!important; width /**/:120px;border 1px;}
注意　width(空格)/**/
下载此文件
代码如下:
/***********************

* 创建对象 var c = new Calendar("c"); document.write(c);
* 调用方法 c.show(arg1,arg2,arg3)
* 参数1: 文本输入框(必填). 如 onfocus="c.show(this)";
* 参数2: 按钮或其它可用单击事件的HTML元素(如果使用按钮方式则必填).
如 onclick="c.show(this,c.getObjById(*))" *=文本输入框名称
* 参数3: 如果没有文本框没有值则使用该值初始化日历(选填).
如 onfocus="c.show(this,'2006-01-01')

* 注: 参数顺序不分先后. MSIE6/Opera8/FireFox1.5 下测试通过

***如果您使用本日历控件 请保留该信息 谢谢! *****
* http://2lin.net
* Email:caoailin@gmail.com
* QQ:38062022
* Creation date: 2006-11-22
************************************/

function Calendar(objName)
{
this.style = {

borderColor : "#909eff", //边框颜色
headerBackColor : "#909EFF", //表头背景颜色
headerFontColor : "#ffffff", //表头字体颜色
bodyBarBackColor : "#f4f4f4", //日历标题背景色
bodyBarFontColor : "#000000", //日历标题字体色
bodyBackColor : "#ffffff", //日历背景色
bodyFontColor : "#000000", //日历字体色
bodyHolidayFontColor : "#ff0000", //假日字体色
watermarkColor : "#d4d4d4", //背景水印色
moreDayColor : "#cccccc"

};

this.showMoreDay = false; //是否显示上月和下月的日期

this.Obj = objName;
this.date = null;

this.mouseOffset = null;
this.dateInput = null;
this.timer = null;

};

Calendar.prototype.toString = function()
{
var str = this.getStyle();
str += '\n';
str += '';
str += this.getHeader();
str += this.getBody();
str += '';
return str;
};

Calendar.prototype.getStyle = function()
{
var str = '\n';
return str;

};

Calendar.prototype.getHeader = function()
{
var str = '

\n';
str += '\n';
str += '\n';
str += '\n';
str += '\n';
str += '\n';
str += '\n';
str += '

<<

<

0

0

>

>>

\n';
return str;
};

Calendar.prototype.getBody = function()
{
var n = 0;
var str = this.getBodyBar();
str += '

\n';
for(i = 0; i < 6; i++)
{
str += '';
for(j = 0; j < 7; j++)
{
str += '\n';
}
str += '';
}
str += '\n';
str += '

今天：'+new Date().toFormatString("yyyy年mm月dd日")+'

\n';
return str;
};

Calendar.prototype.getBodyBar = function()
{
var str = '

\n';
var day = new Array('日','一','二','三','四','五','六');
for(i = 0; i < 7; i++)
{
str += '\n';
}
str += '

' + day[i] + '

';
return str;
}

Calendar.prototype.getYearMenu = function(year)
{

var str = '

\n';
for(i = 0; i < 10; i++)
{
var _year = year + i;
var _date = new Date(_year,this.date.getMonth(),this.date.getDate());

str += '

\n';
str += '';
}

str += '

\n';
str += '

if(this.date.getFullYear() != _year) { str += 'onmouseover="this.className=\'menuOver\'" onmouseout="this.className=\'\'" '; } else { str += 'class="menuOver"'; } str += 'onclick="' + this.Obj + '.bindDate(\'' + _date.toFormatString("-") + '\')">' + _year + '年

\n'; str += '\n'; str += '\n'; str += ' << >>

';

var _menu = getObjById("cdrMenu");
_menu.innerHTML = str;

};

Calendar.prototype.getMonthMenu = function()
{

var str = '

\n';
for(i = 1; i <= 12; i++)
{
var _date = new Date(this.date.getFullYear(),i-1,this.date.getDate());

str += '

\n';
}
str += '

if(this.date.getMonth() + 1 != i) { str += 'onmouseover="this.className=\'menuOver\'" onmouseout="this.className=\'\'" '; } else { str += 'class="menuOver"'; } str += 'onclick="' + this.Obj + '.bindDate(\'' + _date.toFormatString("-") + '\')">'+i+'月

';

var _menu = getObjById("cdrMenu");
_menu.innerHTML = str;
};

Calendar.prototype.show = function()
{
if (arguments.length > 3 || arguments.length == 0)
{
alert("对不起！传入参数不对！" );
return;
}

var _date = null;
var _evObj = null;
var _initValue = null

for(i = 0; i < arguments.length; i++)
{
if(typeof(arguments[i]) == "object" && arguments[i].type == "text")
{_date = arguments[i];}
else if(typeof(arguments[i]) == "object")
{_evObj = arguments[i];}
else if(typeof(arguments[i]) == "string")
{_initValue = arguments[i];}
}
_evObj = _evObj || _date;
inputObj = _date;
targetObj = _evObj

if(!_date){alert("传入参数错误!"); return;}

this.dateInput = _date;

_date = _date.value;

if(_date == "" && _initValue) _date = _initValue;

this.bindDate(_date);

var _target = getPosition(_evObj);
var _obj = getObjById("Calendar");
_obj.style.display = "";

_obj.style.left = _target.x + 'px';
if((document.body.clientHeight - (_target.y + _evObj.clientHeight)) >= _obj.clientHeight)
{
_obj.style.top = (_target.y + _evObj.clientHeight) + 'px';
}
else
{
_obj.style.top = (_target.y - _obj.clientHeight) + 'px';
}

};

Calendar.prototype.hide = function()
{
var obj = getObjById("Calendar");
obj.style.display = "none";
};

Calendar.prototype.bindDate = function(date)
{

var _monthDays = new Array(31,30,31,30,31,30,31,31,30,31,30,31);
var _arr = date.split('-');
var _date = new Date(_arr[0],_arr[1]-1,_arr[2]);
if(isNaN(_date)) _date = new Date();
this.date = _date;
this.bindHeader();

var _year = _date.getFullYear();
var _month = _date.getMonth();
var _day = 1;

var _startDay = new Date(_year,_month,1).getDay();
var _previYear = _month == 0 ? _year - 1 : _year;
var _previMonth = _month == 0 ? 11 : _month - 1;
var _previDay = _monthDays[_previMonth];
if (_previMonth == 1) _previDay =((_previYear%4==0)&&(_previYear%100!=0)||(_previYear%400==0))?29:28;
_previDay -= _startDay - 1;
var _nextDay = 1;

_monthDays[1] = ((_year%4==0)&&(_year%100!=0)||(_year%400==0))?29:28;

for(i = 0; i < 40; i++)
{
var _dayElement = getObjById("cdrDay" + i);

_dayElement.onmouseover = Function(this.Obj + ".onMouseOver(this)");
_dayElement.onmouseout = Function(this.Obj + ".onMouseOut(this)");
_dayElement.onclick = Function(this.Obj + ".onClick(this)");
this.onMouseOut(_dayElement);
_dayElement.style.color = "";

if(i < _startDay)
{
//获取上一个月的日期
if(this.showMoreDay)
{
var _previDate = new Date(_year,_month - 1,_previDay);
_dayElement.innerHTML = _previDay;
_dayElement.title = _previDate.toFormatString("yyyy年mm月dd日");
_dayElement.value = _previDate.toFormatString("-");
_dayElement.style.color = this.style.moreDayColor;

_previDay++;

}else
{
_dayElement.innerHTML = "";
_dayElement.title = "";
}

}
else if(_day > _monthDays[_month])
{
//获取下个月的日期
if(this.showMoreDay)
{
var _nextDate = new Date(_year,_month + 1,_nextDay);
_dayElement.innerHTML = _nextDay;
_dayElement.title = _nextDate.toFormatString("yyyy年mm月dd日");
_dayElement.value = _nextDate.toFormatString("-");
_dayElement.style.color = this.style.moreDayColor;

_nextDay++;
}else
{
_dayElement.innerHTML = "";
_dayElement.title = "";
}
}
else if(i >= new Date(_year,_month,1).getDay() && _day <= _monthDays[_month])
{
//获取本月日期
_dayElement.innerHTML = _day;

if(_day == _date.getDate())
{
this.onMouseOver(_dayElement);
_dayElement.onmouseover = Function("");
_dayElement.onmouseout = Function("");
}

if(this.isHoliday(_year,_month,_day))
{
_dayElement.style.color = this.style.bodyHolidayFontColor;
}
var _curDate = new Date(_year, _month, _day);
_dayElement.title = _curDate.toFormatString("yyyy年mm月dd日");
_dayElement.value = _curDate.toFormatString("-");

_day++;

}
else
{
_dayElement.innerHTML = "";
_dayElement.title = "";
}

}

var _menu = getObjById("cdrMenu");
_menu.style.display = "none";

};

Calendar.prototype.bindHeader = function()
{
var _curYear = getObjById("currentYear");
var _curMonth = getObjById("currentMonth");
var _watermark = getObjById("cdrWatermark");

_curYear.innerHTML = this.date.toFormatString("yyyy年");
_curMonth.innerHTML = this.date.toFormatString("mm月");
_watermark.innerHTML = this.date.getFullYear();

};

Calendar.prototype.getToday = function()
{
var _date = new Date();
this.bindDate(_date.toFormatString("-"));
};

Calendar.prototype.isHoliday = function(year,month,date)
{
var _date = new Date(year,month,date);
return (_date.getDay() == 6 || _date.getDay() == 0);
};

Calendar.prototype.onMouseOver = function(obj)
{
obj.className = "dayOver";
};

Calendar.prototype.onMouseOut = function(obj)
{
obj.className = "dayOut";
};

Calendar.prototype.onClick = function(obj)
{
if(obj.innerHTML != "") this.dateInput.value = obj.value;
this.hide();
};

Calendar.prototype.onChangeYear = function(isnext)
{
var _year = this.date.getFullYear();
var _month = this.date.getMonth() + 1;
var _date = this.date.getDate();

if(_year > 999 && _year <10000)
{
if(isnext){_year++;}else{ _year --;}
}
else
{
alert("年份超出范围（1000-9999）!");
}
this.bindDate(_year + '-' + _month + '-' + _date);
};

Calendar.prototype.onChangeMonth = function(isnext)
{
var _year = this.date.getFullYear();
var _month = this.date.getMonth() + 1;
var _date = this.date.getDate();

if(isnext){ _month ++;} else {_month--;}

if(_year > 999 && _year <10000)
{
if(_month < 1) {_month = 12; _year--;}
if(_month > 12) {_month = 1; _year++;}
}
else
{
alert("年份超出范围（1000-9999）!");
}

this.bindDate(_year + '-' + _month + '-' + _date);
};

Calendar.prototype.showMenu = function(isyear)
{
var _menu = getObjById("cdrMenu");

if(isyear != null)
{

var _obj = (isyear)? getObjById("currentYear") : getObjById("currentMonth");

if(isyear)
{
this.getYearMenu(this.date.getFullYear() - 5);
}
else
{
this.getMonthMenu();
}

_menu.style.top = (_obj.offsetTop + _obj.offsetHeight) + 'px';
_menu.style.left = _obj.offsetLeft + 'px';
_menu.style.width = _obj.offsetWidth + 'px';

}

if (this.timer != null) clearTimeout(this.timer);

_menu.style.display="";

}

Calendar.prototype.hideMenu = function()
{
var _obj = getObjById("cdrMenu");
this.timer = window.setTimeout(function(){_obj.style.display='none';},500);
}

Number.prototype.NaN0 = function()
{
return isNaN(this) ? 0 : this;
}

Date.prototype.toFormatString = function(fs)
{
if(fs.length == 1)
{
return this.getFullYear() + fs + (this.getMonth() + 1) + fs + this.getDate();
}
fs = fs.replace("yyyy",this.getFullYear());
fs = fs.replace("mm",(this.getMonth() + 1));
fs = fs.replace("dd",this.getDate());
return fs;
}

/******************************************公用方法及变量********************************************************/
var inputObj = null; //输入对象
var targetObj = null; //单击目标对象
var dragObj = null; //拖动目标对象
var mouseOffset = null; //拖动目标的位置

//获取对象
function getObjById(obj)
{
if(document.getElementById)
{
return document.getElementById(obj);
}
else
{
alert("浏览器不支持!");
}
}

//获取鼠标位置
function mouseCoords(ev)
{
if(ev.pageX || ev.pageY){
return {x:ev.pageX, y:ev.pageY};
}
return {
x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
y:ev.clientY + document.body.scrollTop - document.body.clientTop
};
}

//获取目标的绝对位置
function getPosition(e)
{
var left = 0;
var top = 0;
while (e.offsetParent){
left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);
e = e.offsetParent;
}

left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);

return {x:left, y:top};
}
//获取鼠标的偏移值
function getMouseOffset(target, ev)
{
ev = ev || window.event;
var docPos = getPosition(target);
var mousePos = mouseCoords(ev);
return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
}

//关闭日历
function closeCalendar(evt){

evt = evt || window.event;
var _target= evt.target || evt.srcElement;

if(!_target.getAttribute("Author") && _target != inputObj && _target != targetObj)
{
getObjById("Calendar").style.display = "none";
}
}
//拖动日历开始
function dragStart(evt){

evt = evt || window.event;
var _target= evt.target || evt.srcElement;

if(_target.getAttribute("Author") == "alin_bar")
{
dragObj = getObjById("Calendar");
mouseOffset = getMouseOffset(dragObj, evt);

}
}
//拖动日历中
function drag(evt)
{
evt = evt || window.event;
if(dragObj)
{
var mousePos = mouseCoords(evt);
dragObj.style.left = (mousePos.x - mouseOffset.x) + 'px';
dragObj.style.top = (mousePos.y - mouseOffset.y) + 'px';
}
}
//拖动结束
function dragEnd(evt)
{
dragObj = null;
}

/*****end 公用方法***************/

document.onclick = closeCalendar;

document.onmousedown = dragStart;

document.onmousemove = drag;

document.onmouseup = dragEnd;

/*****************结束********************/

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