JS简单日历选择控件。 <br/> 在使用的网页内加入date.js <script type="text/javascript" src="date.js"></script> <br/> 调用：<input type="text" onfocus="HS_setDate(this)"/> 1.1、焦点离开后不消失，焦点进入产生一个日历，没有单例 1.2、bug修改，选择月或者年份的时候自动消失 1.3、修改选择年份后不消失，但是还有bug，在选择年份或月份后没有选择日期，也不会消失

date.js

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":
		setNotClose();
		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;
}

//获取日历的星期
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();
}

//显示日历
function HS_calender() {
	var lis = "";
	var style = "";
	style += "<style type='text/css'>";
	//北京图片替换以下background:url(calenderbg.gif) no-repeat right center #fff;
	style += ".calender { width:170px; height:auto; background: #fff; font-size:12px; margin-right:14px;  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 .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 Date
		lis = "<li class='lastMonthDate'>" + lastMonthEndDate + "</li>" + lis;
		lastMonthEndDate--;
	}

	for (i = 1; i <= thisMonthEndDate; i++) { // Current Month's Date
		if (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 Date
		lis += "<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'>&raquo;</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'>&laquo;</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;
	}
}

//以对象关闭日历
function closeCalender(d) {
	var boxObj = d.parentNode.parentNode.parentNode;
	boxObj.parentNode.removeChild(boxObj);
}

//以id关闭日历
function closeCalenderById(id) {
	var dom = document.getElementById(id);
	if (dom) {
		dom.parentNode.removeChild(dom);
	}
}

//选择日期
function _selectThisDay(d) {
	var boxObj = d.parentNode.parentNode.parentNode.parentNode.parentNode;
	boxObj.targetObj.value = d.title;
	boxObj.parentNode.removeChild(boxObj);
}

//添加日历年份
function CalenderselectYear(obj) {
	setNotClose(obj.parentNode.parentNode.parentNode.parentNode.previousSibling);
	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;
}

//添加日历月份
function CalenderselectMonth(obj) {
	setNotClose(obj.parentNode.parentNode.parentNode.parentNode.previousSibling);
	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;
}

//选择年份
function selectThisYear(obj) {
	setNotClose(obj.parentNode.parentNode.parentNode.parentNode.previousSibling);
	HS_calender(obj.value
			+ "-"
			+ obj.parentNode.parentNode.getElementsByTagName("span")[1]
					.getElementsByTagName("a")[0].innerHTML + "-1",
			obj.parentNode);
}

//选择月份
function selectThisMonth(obj) {
	setNotClose(obj.parentNode.parentNode.parentNode.parentNode.previousSibling);
	HS_calender(obj.parentNode.parentNode.getElementsByTagName("span")[0]
			.getElementsByTagName("a")[0].innerHTML
			+ "-" + obj.value + "-1", obj.parentNode);

}

//显示日历
function HS_setDate(inputObj, id) {
	var calenderObj = document.createElement("span");
	calenderObj.setAttribute("id", id);
	calenderObj.innerHTML = HS_calender(new Date());
	calenderObj.style.position = "absolute";
	calenderObj.targetObj = inputObj;
	inputObj.parentNode.insertBefore(calenderObj, inputObj.nextSibling);
}

//设置一点时间内不关闭
function setNotClose(obj){
	close = false;
	setTimeout(function(){
		close = true;
	}, 300)
}

//标志是否关闭日历
var close = true;

//延时关闭日历显示
function hideDateCtrl(id) {
	setTimeout(function() {
		if(close){
			closeCalenderById(id);
		}
	}, 200);
}

//显示唯一日历信息
function showDateCtrl(dom, id) {
	var s = document.getElementById(id);
	if (s) {
		
	} else {
		HS_setDate(dom, id);
	}
}

u2t.html

<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>\u代码转换</title>
<style type="text/css">
<!--
.btn{
 font-family: Verdana, Arial, Helvetica, sans-serif;
 font-size: 12px;
 color: #666666;
 text-align: left;
 text-decoration: none;
 display: block;
 overflow: visible;
 margin-right: 10px;
 margin-left: 10px;
}
.btn a:hover {
 background-color: #d8dfea;
 border-top-width: 1px;
 border-bottom-width: 1px;
 border-top-style: solid;
 border-bottom-style: solid;
 border-top-color: #333366;
 border-bottom-color: #333366;
}
.btn a {
 display: block;
 text-decoration: none;
 color: #666666;
 border-top-width: 1px;
 border-bottom-width: 1px;
 border-top-style: solid;
 border-bottom-style: solid;
 border-top-color: #CCCCCC;
 border-bottom-color: #CCCCCC;
 width: 100px;
 padding-top: 5px;
 padding-right: 10px;
 padding-bottom: 5px;
 padding-left: 30px;
 overflow: visible;
 float: left;
}
html {
 font-family: Verdana, Arial, Helvetica, sans-serif;
 font-size: 12px;
 color: #333333;
 line-height: 18px;
 margin: 0px;
}
-->
body{
 margin:0px;
}
</style>
</head>
<body>
<p>
 <textarea name="source" rows="14" id="source" style="width:99%">
 请在这儿输入
</textarea>
</p>
<div class="btn"> <a href="javascript:action('CONVERT_FMT1')"> <strong>Convert</strong><br>
 Fmort &amp;#xxxx </a></div>
<div class="btn"> <a href="javascript:action('CONVERT_FMT2')"> <strong>Convert</strong><br>
 Fmort \uxxxx </a> </div>
<div class="btn"> <a href="javascript:action('RECONVERT')"> <strong>ReConvert</strong><br>
 To 汉字 </a> </div>
<p>
</p><div id="tt" style="display:none"></div>
<textarea name="show2" rows="14" id="show2" style="width:99%"></textarea>
<p></p>


<script language="javascript" type="text/javascript">
var oSource = document.getElementById("source");
var oShow2 = document.getElementById("show2");
var oTt = document.getElementById("tt");
function action(pChoice){
 switch(pChoice){
  case "CONVERT_FMT1":
   oShow2.value = ascii(oSource.value);
   break;
  case "CONVERT_FMT2":
   oShow2.value = unicode(oSource.value);
   break;
  case "RECONVERT":
   oShow2.value = reconvert(oSource.value);
   break;
 }
}
function ascii(str){
 return str.replace(/[^\u0000-\u00FF]/g,function($0){return escape($0).replace(/(%u)(\w{4})/gi,"\&#x$2;")});
}
function unicode(str){
 return str.replace(/[^\u0000-\u00FF]/g,function($0){return escape($0).replace(/(%u)(\w{4})/gi,"\\u$2")});
}
function reconvert(str){ 
 str = str.replace(/(\\u)(\w{4})/gi,function($0){
            return (String.fromCharCode(parseInt((escape($0).replace(/(%5Cu)(\w{4})/g,"$2")),16)));
            });
            
 str = str.replace(/(&#x)(\w{4});/gi,function($0){
            return String.fromCharCode(parseInt(escape($0).replace(/(%26%23x)(\w{4})(%3B)/g,"$2"),16));
            });            
 return str;
}
</script>
</body></html>