javascript日期选择组件
这是一个网上找的简单的日期选择组件，简单实用。附带一个超过 25 个华丽的 Web 日历组件地址如下：
http://www.oschina.net/question/12_21647?from=20110612
<html><head><title>timer</title><script type="text/javascript">function HS_DateAdd(interval,number,date){number = parseInt(number);if (typeof(date)=="string"){var date = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2])}if (typeof(date)=="object"){var date = date}switch(interval){case "y":return new Date(date.getFullYear()+number,date.getMonth(),date.getDate()); break;case "m":return new Date(date.getFullYear(),date.getMonth()+number,checkDate(date.getFullYear(),date.getMonth()+number,date.getDate())); break;case "d":return new Date(date.getFullYear(),date.getMonth(),date.getDate()+number); break;case "w":return new Date(date.getFullYear(),date.getMonth(),7*number+date.getDate()); break;}}function checkDate(year,month,date){var enddate = ["31","28","31","30","31","30","31","31","30","31","30","31"];var returnDate = "";if (year%4==0){enddate[1]="29"}if (date>enddate[month]){returnDate = enddate[month]}else{returnDate = date}return returnDate;}function WeekDay(date){var theDate;if (typeof(date)=="string"){theDate = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2]);}if (typeof(date)=="object"){theDate = date}return theDate.getDay();}function HS_calender(){var lis = "";var style = "";/*可以把下面的css剪切出去独立一个css文件*/style +="<style type='text/css'>";style +=".calender { width:170px; height:auto; font-size:12px; margin-right:14px; background:url(calenderbg.gif) no-repeat right center #fff; border:1px solid #397EAE; padding:1px}";style +=".calender ul {list-style-type:none; margin:0; padding:0;}";style +=".calender .day { background-color:#EDF5FF; height:20px;}"; style +=".calender li { list-style-type: none; float: left; margin: 0 0px; padding: 0 !important; background: #ffffff; background-image: none !important;}"; style +=".calender .day li,.calender .date li{ float:left; width:14%; height:20px; line-height:20px; text-align:center}";style +=".calender li a { text-decoration:none; font-family:Tahoma; font-size:11px; color:#333}";style +=".calender li a:hover { color:#f30; text-decoration:underline}";style +=".calender li a.hasArticle {font-weight:bold; color:#f60 !important}";style +=".lastMonthDate, .nextMonthDate {color:#bbb;font-size:11px}";style +=".selectThisYear a, .selectThisMonth a{text-decoration:none; margin:0 2px; color:#000; font-weight:bold}";style +=".calender .LastMonth, .calender .NextMonth{ text-decoration:none; color:#000; font-size:18px; font-weight:bold; line-height:16px;}";style +=".calender .LastMonth { float:left;}";style +=".calender .NextMonth { float:right;}";style +=".calenderBody {clear:both}";style +=".calenderTitle {text-align:center;height:20px; line-height:20px; clear:both}";style +=".today { background-color:#ffffaa;border:1px solid #f60; padding:2px}";style +=".today a { color:#f30; }";style +=".calenderBottom {clear:both; border-top:1px solid #ddd; padding: 3px 0; text-align:left}";style +=".calenderBottom a {text-decoration:none; margin:2px !important; font-weight:bold; color:#000}";style +=".calenderBottom a.closeCalender{float:right}";style +=".closeCalenderBox {float:right; border:1px solid #000; background:#fff; font-size:9px; width:11px; height:11px; line-height:11px; text-align:center;overflow:hidden; font-weight:normal !important}";style +="</style>";var now;if (typeof(arguments[0])=="string"){selectDate = arguments[0].split("-");var year = selectDate[0];var month = parseInt(selectDate[1])-1+"";var date = selectDate[2];now = new Date(year,month,date);}else if (typeof(arguments[0])=="object"){now = arguments[0];}var lastMonthEndDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+now.getMonth()+"-01").getDate();var lastMonthDate = WeekDay(now.getFullYear()+"-"+now.getMonth()+"-01");var thisMonthLastDate = HS_DateAdd("d","-1",now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-01");var thisMonthEndDate = thisMonthLastDate.getDate();var thisMonthEndDay = thisMonthLastDate.getDay();var todayObj = new Date();today = todayObj.getFullYear()+"-"+todayObj.getMonth()+"-"+todayObj.getDate();for (i=0; i<lastMonthDate; i++){ // Last Month's Datelis = "<li class='lastMonthDate'>"+lastMonthEndDate+"</li>" + lis;lastMonthEndDate--;}for (i=1; i<=thisMonthEndDate; i++){ // Current Month's Dateif(today == now.getFullYear()+"-"+now.getMonth()+"-"+i){var todayString = now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-"+i;lis += "<li><a href=javascript:void(0) class='today' onclick='_selectThisDay(this)' title='"+now.getFullYear()+"-"+(parseInt(now.getMonth())+1)+"-"+i+"'>"+i+"</a></li>";}else{lis += "<li><a href=javascript:void(0) onclick='_selectThisDay(this)' title='"+now.getFullYear()+"-"+(parseInt(now.getMonth())+1)+"-"+i+"'>"+i+"</a></li>";}}var j=1;for (i=thisMonthEndDay; i<6; i++){ // Next Month's Datelis += "<li class='nextMonthDate'>"+j+"</li>";j++;}lis += style;var CalenderTitle = "<a href='javascript:void(0)' class='NextMonth' onclick=HS_calender(HS_DateAdd('m',1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Next Month'>»</a>";CalenderTitle += "<a href='javascript:void(0)' class='LastMonth' onclick=HS_calender(HS_DateAdd('m',-1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this) title='Previous Month'>«</a>";CalenderTitle += "<span class='selectThisYear'><a href='javascript:void(0)' onclick='CalenderselectYear(this)' title='Click here to select other year' >"+now.getFullYear()+"</a></span>年<span class='selectThisMonth'><a href='javascript:void(0)' onclick='CalenderselectMonth(this)' title='Click here to select other month'>"+(parseInt(now.getMonth())+1).toString()+"</a></span>月"; if (arguments.length>1){arguments[1].parentNode.parentNode.getElementsByTagName("ul")[1].innerHTML = lis;arguments[1].parentNode.innerHTML = CalenderTitle;}else{var CalenderBox = style+"<div class='calender'><div class='calenderTitle'>"+CalenderTitle+"</div><div class='calenderBody'><ul class='day'><li>日</li><li>一</li><li>二</li><li>三</li><li>四</li><li>五</li><li>六</li></ul><ul class='date' id='thisMonthDate'>"+lis+"</ul></div><div class='calenderBottom'><a href='javascript:void(0)' class='closeCalender' onclick='closeCalender(this)'>×</a><span><span><a href=javascript:void(0) onclick='_selectThisDay(this)' title='"+todayString+"'>Today</a></span></span></div></div>";return CalenderBox;}}function _selectThisDay(d){var boxObj = d.parentNode.parentNode.parentNode.parentNode.parentNode;boxObj.targetObj.value = d.title;boxObj.parentNode.removeChild(boxObj);}function closeCalender(d){var boxObj = d.parentNode.parentNode.parentNode;boxObj.parentNode.removeChild(boxObj);}function CalenderselectYear(obj){var opt = "";var thisYear = obj.innerHTML;for (i=1970; i<=2020; i++){if (i==thisYear){opt += "<option value="+i+" selected>"+i+"</option>";}else{opt += "<option value="+i+">"+i+"</option>";}}opt = "<select onblur='selectThisYear(this)' onchange='selectThisYear(this)' style='font-size:11px'>"+opt+"</select>";obj.parentNode.innerHTML = opt;}function selectThisYear(obj){HS_calender(obj.value+"-"+obj.parentNode.parentNode.getElementsByTagName("span")[1].getElementsByTagName("a")[0].innerHTML+"-1",obj.parentNode);}function CalenderselectMonth(obj){var opt = "";var thisMonth = obj.innerHTML;for (i=1; i<=12; i++){if (i==thisMonth){opt += "<option value="+i+" selected>"+i+"</option>";}else{opt += "<option value="+i+">"+i+"</option>";}}opt = "<select onblur='selectThisMonth(this)' onchange='selectThisMonth(this)' style='font-size:11px'>"+opt+"</select>";obj.parentNode.innerHTML = opt;}function selectThisMonth(obj){HS_calender(obj.parentNode.parentNode.getElementsByTagName("span")[0].getElementsByTagName("a")[0].innerHTML+"-"+obj.value+"-1",obj.parentNode);}function HS_setDate(inputObj){var calenderObj = document.createElement("span");calenderObj.innerHTML = HS_calender(new Date());calenderObj.style.position = "absolute";calenderObj.targetObj = inputObj;inputObj.parentNode.insertBefore(calenderObj,inputObj.nextSibling);} </script></head><body>调用：<input name="color" type="text" onfocus="HS_setDate(this)""></body></html>