一个漂亮JS日期代码

<!--
var cal;
var isFocus=false; //是否为焦点
//以上为 2006-06-25 添加的变量

//选择日期 → 添加
function SelectDate(obj,strFormat){

//这是在页面中要调用的方法比如onclick="SelectDate(this,'yyyy-MM-dd')"
var date = new Date();
var by = date.getFullYear()-50; //最小值 → 50 年前
var ey = date.getFullYear()+50; //最大值 → 50 年后
cal = new Calendar(by, ey,0,strFormat); //初始化英文版，0 为中文版
cal = (cal==null) ? new Calendar(by, ey, 1) : cal; //不用每次都初始化 2006-12-03 修正
cal.dateFormatStyle = strFormat;
cal.show(obj);
}
/**//**//**//**
* 返回日期
* @param d the delimiter
* @param p the pattern of your date
2006-06-25 修改为根据用户指定的 style 来确定；
*/
//String.prototype.toDate = function(x, p) {
String.prototype.toDate = function(style){
/**//**//**//*
if(x == null) x = "-";
if(p == null) p = "ymd";
var a = this.split(x);
var y = parseInt(a[p.indexOf("y")]);
//remember to change this next century ;)
if(y.toString().length <= 2) y += 2000;
if(isNaN(y)) y = new Date().getFullYear();
var m = parseInt(a[p.indexOf("m")]) - 1;
var d = parseInt(a[p.indexOf("d")]);
if(isNaN(d)) d = 1;
return new Date(y, m, d);
*/
var y = this.substring(style.indexOf('y'),style.lastIndexOf('y')+1);//年
var m = this.substring(style.indexOf('M'),style.lastIndexOf('M')+1);//月
var d = this.substring(style.indexOf('d'),style.lastIndexOf('d')+1);//日
if(isNaN(y)) y = new Date().getFullYear();
if(isNaN(m)) m = new Date().getMonth();
if(isNaN(d)) d = new Date().getDate();
var dt ;
eval ("dt = new Date('"+ y+"', '"+(m-1)+"','"+ d +"')");
return dt;
}

/**//**//**//**
* 格式化日期
* @param d the delimiter
* @param p the pattern of your date
* @author meizz
*/
Date.prototype.format = function(style){
var o ={
"M+" : this.getMonth() + 1, //month
"d+" : this.getDate(), //day
"h+" : this.getHours(), //hour
"m+" : this.getMinutes(), //minute
"s+" : this.getSeconds(), //second
"w+" : "/u5929/u4e00/u4e8c/u4e09/u56db/u4e94/u516d".charAt(this.getDay()), //week
"q+" : Math.floor((this.getMonth() + 3) / 3), //quarter
"S" : this.getMilliseconds() //millisecond
}
if(/(y+)/.test(style)){
style = style.replace(RegExp.$1,
(this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
for(var k in o){
if(new RegExp("("+ k +")").test(style)){
style = style.replace(RegExp.$1,
RegExp.$1.length == 1 ? o[k] :
("00" + o[k]).substr(("" + o[k]).length));
}
}
return style;
};

/**//**//**//**
* 日历类
* @param beginYear 1990
* @param endYear 2010
* @param lang 0(中文)|1(英语) 可自扩充
* @param dateFormatStyle "yyyy-MM-dd";
* @version 2006-04-01
* @author KimSoft (jinqinghua [at] gmail.com)
* @update
*/
function Calendar(beginYear, endYear, lang, dateFormatStyle){
this.beginYear = 1990;
this.endYear = 2010;
this.lang = 0; //0(中文) | 1(英文)
this.dateFormatStyle = "yyyy-MM-dd";

if (beginYear != null && endYear != null){
this.beginYear = beginYear;
this.endYear = endYear;
}
if (lang != null){
this.lang = lang
}

if (dateFormatStyle != null){
this.dateFormatStyle = dateFormatStyle
}

this.dateControl = null;
this.panel = this.getElementById("calendarPanel");
this.container = this.getElementById("ContainerPanel");
this.form = null;

this.date = new Date();
this.year = this.date.getFullYear();
this.month = this.date.getMonth();

this.colors ={
"cur_word" : "#FFFFFF", //当日日期文字颜色
"cur_bg" : "#00FF00", //当日日期单元格背影色
"sel_bg" : "#FFCCCC", //已被选择的日期单元格背影色 2006-12-03添加
"sun_word" : "#FF0000", //星期天文字颜色
"sat_word" : "#0000FF", //星期六文字颜色
"td_word_light" : "#333333", //单元格文字颜色
"td_word_dark" : "#CCCCCC", //单元格文字暗色
"td_bg_out" : "#EFEFEF", //单元格背影色
"td_bg_over" : "#FFCC00", //单元格背影色
"tr_word" : "#FFFFFF", //日历头文字颜色
"tr_bg" : "#666666", //日历头背影色
"input_border" : "#CCCCCC", //input控件的边框颜色
"input_bg" : "#EFEFEF" //input控件的背影色
}

this.draw();
this.bindYear();
this.bindMonth();
this.changeSelect();
this.bindData();
}

/**//**//**//**
* 日历类属性（语言包，可自扩展）
*/
Calendar.language ={
"year" : [[""], [""]],
"months" : [["/u4e00/u6708","/u4e8c/u6708","/u4e09/u6708","/u56db/u6708","/u4e94/u6708","/u516d/u6708","/u4e03/u6708","/u516b/u6708","/u4e5d/u6708","/u5341/u6708","/u5341/u4e00/u6708","/u5341/u4e8c/u6708"],
["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"]
],
"weeks" : [["/u65e5","/u4e00","/u4e8c","/u4e09","/u56db","/u4e94","/u516d"],
["SUN","MON","TUR","WED","THU","FRI","SAT"]
],
"clear" : [["/u6e05/u7a7a"], ["CLS"]],
"today" : [["/u4eca/u5929"], ["TODAY"]],
"close" : [["/u5173/u95ed"], ["CLOSE"]]
}

Calendar.prototype.draw = function(){
calendar = this;

var mvAry = [];
//mvAry[mvAry.length] = ' <form name="calendarForm" style="margin: 0px;">'; //因 <form> 不能嵌套， 2006-12-01 改用 Div
mvAry[mvAry.length] = ' <div name="calendarForm" style="margin: 0px;">';
mvAry[mvAry.length] = ' <table width="100%" border="0" cellpadding="0" cellspacing="1">';
mvAry[mvAry.length] = ' <tr>';
mvAry[mvAry.length] = ' <th align="left" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="prevMonth" type="button" id="prevMonth" value="<" /></th>';
mvAry[mvAry.length] = ' <th align="center" width="98%" nowrap="nowrap"><select name="calendarYear" id="calendarYear" style="font-size:12px;"></select><select name="calendarMonth" id="calendarMonth" style="font-size:12px;"></select></th>';
mvAry[mvAry.length] = ' <th align="right" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="nextMonth" type="button" id="nextMonth" value=">" /></th>';
mvAry[mvAry.length] = ' </tr>';
mvAry[mvAry.length] = ' </table>';
mvAry[mvAry.length] = ' <table id="calendarTable" width="100%" style="border:0px solid #CCCCCC;background-color:#FFFFFF" border="0" cellpadding="3" cellspacing="1">';
mvAry[mvAry.length] = ' <tr>';
for(var i = 0; i < 7; i++){
mvAry[mvAry.length] = ' <th style="font-weight:normal;background-color:' + calendar.colors["tr_bg"] + ';color:' + calendar.colors["tr_word"] + ';">' + Calendar.language["weeks"][this.lang][i] + '</th>';
}
mvAry[mvAry.length] = ' </tr>';
for(var i = 0; i < 6;i++){
mvAry[mvAry.length] = ' <tr align="center">';
for(var j = 0; j < 7; j++){
if (j == 0){
mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sun_word"] + ';"></td>';
} else if(j == 6){
mvAry[mvAry.length] = ' <td style="cursor:default;color:' + calendar.colors["sat_word"] + ';"></td>';
} else{
mvAry[mvAry.length] = ' <td style="cursor:default;"></td>';
}
}
mvAry[mvAry.length] = ' </tr>';
}
mvAry[mvAry.length] = ' <tr style="background-color:' + calendar.colors["input_bg"] + ';">';
mvAry[mvAry.length] = ' <th colspan="2"><input name="calendarClear" type="button" id="calendarClear" value="' + Calendar.language["clear"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
mvAry[mvAry.length] = ' <th colspan="3"><input name="calendarToday" type="button" id="calendarToday" value="' + Calendar.language["today"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
mvAry[mvAry.length] = ' <th colspan="2"><input name="calendarClose" type="button" id="calendarClose" value="' + Calendar.language["close"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
mvAry[mvAry.length] = ' </tr>';
mvAry[mvAry.length] = ' </table>';
//mvAry[mvAry.length] = ' </from>';
mvAry[mvAry.length] = ' </div>';
this.panel.innerHTML = mvAry.join("");

/**//******** 以下代码 2006-12-01 添加 **********/
var obj = this.getElementById("prevMonth");
obj.onclick = function (){calendar.goPrevMonth(calendar);}
obj.onblur = function (){calendar.onblur();}
this.prevMonth= obj;

obj = this.getElementById("nextMonth");
obj.onclick = function (){calendar.goNextMonth(calendar);}
obj.onblur = function (){calendar.onblur();}
this.nextMonth= obj;

obj = this.getElementById("calendarClear");
obj.onclick = function (){calendar.dateControl.value = "";calendar.hide();}
this.calendarClear = obj;

obj = this.getElementById("calendarClose");
obj.onclick = function (){calendar.hide();}
this.calendarClose = obj;

obj = this.getElementById("calendarYear");
obj.onchange = function (){calendar.update(calendar);}
obj.onblur = function (){calendar.onblur();}
this.calendarYear = obj;

obj = this.getElementById("calendarMonth");
with(obj)
{
onchange = function (){calendar.update(calendar);}
onblur = function (){calendar.onblur();}
}this.calendarMonth = obj;

obj = this.getElementById("calendarToday");
obj.onclick = function (){
var today = new Date();
calendar.date = today;
calendar.year = today.getFullYear();
calendar.month = today.getMonth();
calendar.changeSelect();
calendar.bindData();
calendar.dateControl.value = today.format(calendar.dateFormatStyle);
calendar.hide();
}
this.calendarToday = obj;
/**//******** 以上代码 2006-12-01 添加 **********/

/**//*
//this.form = document.forms["calendarForm"];
this.form.prevMonth.onclick = function () {calendar.goPrevMonth(this);}
this.form.nextMonth.onclick = function () {calendar.goNextMonth(this);}

this.form.prevMonth.onblur = function () {calendar.onblur();}
this.form.nextMonth.onblur = function () {calendar.onblur();}

this.form.calendarClear.onclick = function () {calendar.dateControl.value = "";calendar.hide();}
this.form.calendarClose.onclick = function () {calendar.hide();}
this.form.calendarYear.onchange = function () {calendar.update(this);}
this.form.calendarMonth.onchange = function () {calendar.update(this);}

this.form.calendarYear.onblur = function () {calendar.onblur();}
this.form.calendarMonth.onblur = function () {calendar.onblur();}

this.form.calendarToday.onclick = function () {
var today = new Date();
calendar.date = today;
calendar.year = today.getFullYear();
calendar.month = today.getMonth();
calendar.changeSelect();
calendar.bindData();
calendar.dateControl.value = today.format(calendar.dateFormatStyle);
calendar.hide();
}
*/
}

//年份下拉框绑定数据
Calendar.prototype.bindYear = function(){
//var cy = this.form.calendarYear;
var cy = this.calendarYear;//2006-12-01 修改
cy.length = 0;
for (var i = this.beginYear; i <= this.endYear; i++){
cy.options[cy.length] = new Option(i + Calendar.language["year"][this.lang], i);
}
}

//月份下拉框绑定数据
Calendar.prototype.bindMonth = function(){
//var cm = this.form.calendarMonth;
var cm = this.calendarMonth;//2006-12-01 修改
cm.length = 0;
for (var i = 0; i < 12; i++){
cm.options[cm.length] = new Option(Calendar.language["months"][this.lang][i], i);
}
}

//向前一月
Calendar.prototype.goPrevMonth = function(e){
if (this.year == this.beginYear && this.month == 0){return;}
this.month--;
if (this.month == -1){
this.year--;
this.month = 11;
}
this.date = new Date(this.year, this.month, 1);
this.changeSelect();
this.bindData();
}

//向后一月
Calendar.prototype.goNextMonth = function(e){
if (this.year == this.endYear && this.month == 11){return;}
this.month++;
if (this.month == 12){
this.year++;
this.month = 0;
}
this.date = new Date(this.year, this.month, 1);
this.changeSelect();
this.bindData();
}

//改变SELECT选中状态
Calendar.prototype.changeSelect = function(){
//var cy = this.form.calendarYear;
//var cm = this.form.calendarMonth;
var cy = this.calendarYear;//2006-12-01 修改
var cm = this.calendarMonth;
for (var i= 0; i < cy.length; i++){
if (cy.options[i].value == this.date.getFullYear()){
cy[i].selected = true;
break;
}
}
for (var i= 0; i < cm.length; i++){
if (cm.options[i].value == this.date.getMonth()){
cm[i].selected = true;
break;
}
}
}

//更新年、月
Calendar.prototype.update = function (e){
//this.year = e.form.calendarYear.options[e.form.calendarYear.selectedIndex].value;
//this.month = e.form.calendarMonth.options[e.form.calendarMonth.selectedIndex].value;
this.year = e.calendarYear.options[e.calendarYear.selectedIndex].value;//2006-12-01 修改
this.month = e.calendarMonth.options[e.calendarMonth.selectedIndex].value;
this.date = new Date(this.year, this.month, 1);
this.changeSelect();
this.bindData();
}

//绑定数据到月视图
Calendar.prototype.bindData = function (){
var calendar = this;
var dateArray = this.getMonthViewArray(this.date.getYear(), this.date.getMonth());
var tds = this.getElementById("calendarTable").getElementsByTagName("td");
for(var i = 0; i < tds.length; i++){
//tds[i].style.color = calendar.colors["td_word_light"];
tds[i].style.backgroundColor = calendar.colors["td_bg_out"];
tds[i].onclick = function (){return;}
tds[i].onmouseover = function (){return;}
tds[i].onmouseout = function (){return;}
if (i > dateArray.length - 1) break;
tds[i].innerHTML = dateArray[i];
if (dateArray[i] != " "){
tds[i].onclick = function (){
if (calendar.dateControl != null){
calendar.dateControl.value = new Date(calendar.date.getFullYear(),
calendar.date.getMonth(),
this.innerHTML).format(calendar.dateFormatStyle);
}
calendar.hide();
}
tds[i].onmouseover = function (){
this.style.backgroundColor = calendar.colors["td_bg_over"];
}
tds[i].onmouseout = function (){
this.style.backgroundColor = calendar.colors["td_bg_out"];
}
if (new Date().format(calendar.dateFormatStyle) ==
new Date(calendar.date.getFullYear(),
calendar.date.getMonth(),
dateArray[i]).format(calendar.dateFormatStyle)){
//tds[i].style.color = calendar.colors["cur_word"];
tds[i].style.backgroundColor = calendar.colors["cur_bg"];
tds[i].onmouseover = function (){
this.style.backgroundColor = calendar.colors["td_bg_over"];
}
tds[i].onmouseout = function (){
this.style.backgroundColor = calendar.colors["cur_bg"];
}
//continue; //若不想当天单元格的背景被下面的覆盖，请取消注释 → 2006-12-03添加
}//end if

//设置已被选择的日期单元格背影色 2006-12-03添加
if (calendar.dateControl != null && calendar.dateControl.value == new Date(calendar.date.getFullYear(),
calendar.date.getMonth(),
dateArray[i]).format(calendar.dateFormatStyle)){
tds[i].style.backgroundColor = calendar.colors["sel_bg"];
tds[i].onmouseover = function (){
this.style.backgroundColor = calendar.colors["td_bg_over"];
}
tds[i].onmouseout = function (){
this.style.backgroundColor = calendar.colors["sel_bg"];
}
}
}
}
}

//根据年、月得到月视图数据(数组形式)
Calendar.prototype.getMonthViewArray = function (y, m){
var mvArray = [];
var dayOfFirstDay = new Date(y, m, 1).getDay();
var daysOfMonth = new Date(y, m + 1, 0).getDate();
for (var i = 0; i < 42; i++){
mvArray[i] = " ";
}
for (var i = 0; i < daysOfMonth; i++){
mvArray[i + dayOfFirstDay] = i + 1;
}
return mvArray;
}

//扩展 document.getElementById(id) 多浏览器兼容性 from meizz tree source
Calendar.prototype.getElementById = function(id){
if (typeof(id) != "string" || id == "") return null;
if (document.getElementById) return document.getElementById(id);
if (document.all) return document.all(id);
try{return eval(id);} catch(e){ return null;}
}

//扩展 object.getElementsByTagName(tagName)
Calendar.prototype.getElementsByTagName = function(object, tagName){
if (document.getElementsByTagName) return document.getElementsByTagName(tagName);
if (document.all) return document.all.tags(tagName);
}

//取得HTML控件绝对位置
Calendar.prototype.getAbsPoint = function (e){
var x = e.offsetLeft;
var y = e.offsetTop;
while(e = e.offsetParent){
x += e.offsetLeft;
y += e.offsetTop;
}
return{"x": x, "y": y};
}

//显示日历
Calendar.prototype.show = function (dateObj, popControl){
if (dateObj == null){
throw new Error("arguments[0] is necessary")
}
this.dateControl = dateObj;

//if (dateObj.value.length > 0){
//this.date = new Date(dateObj.value.toDate());
//this.date = new Date(dateObj.value.toDate(this.dateFormatStyle));//修改，带入用户指定的 style
this.date = (dateObj.value.length > 0) ? new Date(dateObj.value.toDate(this.dateFormatStyle)) : new Date() ;//2006-12-03添加 → 若为空则显示当前月份
this.year = this.date.getFullYear();
this.month = this.date.getMonth();
this.changeSelect();
this.bindData();
//}
if (popControl == null){
popControl = dateObj;
}
var xy = this.getAbsPoint(popControl);
this.panel.style.left = xy.x -25 + "px";
this.panel.style.top = (xy.y + dateObj.offsetHeight) + "px";

// 修改 → 把 visibility 变为 display，并添加失去焦点的事件
//this.setDisplayStyle("select", "hidden");
//this.panel.style.visibility = "visible";
//this.container.style.visibility = "visible";
this.panel.style.display = "";
this.container.style.display = "";

dateObj.onblur = function(){calendar.onblur();}
this.container.onmouseover = function(){isFocus=true;}
this.container.onmouseout = function(){isFocus=false;}
}

//隐藏日历
Calendar.prototype.hide = function(){
//this.setDisplayStyle("select", "visible");
//this.panel.style.visibility = "hidden";
//this.container.style.visibility = "hidden";
this.panel.style.display = "none";
this.container.style.display = "none";
isFocus=false;
}

//焦点转移时隐藏日历 → 添加
Calendar.prototype.onblur = function(){
if(!isFocus){this.hide();}
}

//以下 修改 → 用<iframe> 遮住 IE 的下拉框
/**//**//**//*
//设置控件显示或隐藏
Calendar.prototype.setDisplayStyle = function(tagName, style) {
var tags = this.getElementsByTagName(null, tagName)
for(var i = 0; i < tags.length; i++) {
if (tagName.toLowerCase() == "select" &&
(tags[i].name == "calendarYear" ||
tags[i].name == "calendarMonth")){
continue;
}
//tags[i].style.visibility = style;
tags[i].style.display = style;
}
}
*/
//document.write('<div id="ContainerPanel" style="visibility:hidden"><div id="calendarPanel" style="position: absolute;visibility: hidden;z-index: 9999;');
document.write('<div id="ContainerPanel" style="display:none"><div id="calendarPanel" style="position: absolute;display: none;z-index: 9999;');
document.write('background-color: #FFFFFF;border: 1px solid #CCCCCC;width:175px;font-size:12px;"></div>');
if(document.all)
{
document.write('<iframe style="position:absolute;z-index:2000;width:expression(this.previousSibling.offsetWidth);');
document.write('height:expression(this.previousSibling.offsetHeight);');
document.write('left:expression(this.previousSibling.offsetLeft);top:expression(this.previousSibling.offsetTop);');
document.write('display:expression(this.previousSibling.style.display);" scrolling="no" frameborder="no"></iframe>');
}
document.write('</div>');
//var calendar = new Calendar(); //此句被注释，否则 IE 将报错
//调用calendar.show(dateControl, popControl);
//-->