<style type="text/css">
 * {
 margin: 0;
 padding: 0;
 }
 ul, li {
 list-style: none;
 }
 #week {
 width: 350px;
 height: 350px;
 border: 1px solid #ccc;
 }
 #week h6 {
 font-size: 20px;
 overflow: hidden;
 height: 40px;
 line-height: 40px;
 }
 #week h6 div {
 float: left;
 width: 250px;
 text-align: center;
 }
 #week .prev {
 float: left;
 font-size: 12px;
 width: 50px;
 cursor: pointer;
 }
 #week .next {
 float: right;
 font-size: 12px;
 width: 50px;
 cursor: pointer;
 }
 #week p span {
 width: 50px;
 float: left;
 text-align: center;
 height: 30px;
 line-height: 30px;
 }
 #week p {
 background: #ccc;
 overflow: hidden;
 height: 30px;
 }
 #week ul {
 margin-top: 10px;
 }
 #week ul li {
 width: 50px;
 float: left;
 text-align: center;
 height: 30px;
 cursor: pointer;
 }
 </style>
<input type="text" id="ele" onfocus="currentWeek(this)"/>
<script>
 function currentWeek(ele) {
 var obj = offset(ele);
 var x = obj.left;
 var y = obj.top + ele.offsetHeight + 1;
 //創(chuàng)建日歷界面
 if (!document.getElementById('week')) {
 var oDiv = document.createElement('div');
 document.body.appendChild(oDiv);
 oDiv.id = 'week';
 oDiv.style.top = y + "px";
 oDiv.style.left = x + "px";
 //創(chuàng)建日歷title
 var h6 = document.createElement('h6');
 oDiv.appendChild(h6);
 var prev = document.createElement('div');
 h6.appendChild(prev);
 prev.className = 'prev';
 prev.innerHTML = '上個(gè)月';
 var content = document.createElement('div');
 content.className = "content";
 h6.appendChild(content);
 var next = document.createElement('div');
 h6.appendChild(next);
 next.className = 'next';
 next.innerHTML = '下個(gè)月';
 //創(chuàng)建星期日到星期六的文字行
 var oPs = document.createElement('p');
 oPs.className = "rlTitle";
 oDiv.appendChild(oPs);
 var opsCont = ['日', '一', '二', '三', '四', '五', '六'];
 for (var i = 0; i <= 6; i++) {
 var oSpan = document.createElement('span');
 oPs.appendChild(oSpan);
 oSpan.innerHTML = opsCont[i];
 }
 //創(chuàng)建日歷上面的日期行數(shù)所需要的變量
 var oUl = document.createElement('ul');
 oUl.className = "rlCenter";
 oDiv.appendChild(oUl);
 var currentDate = new Date();
 var currentYear = currentDate.getFullYear();
 var currentMonth = currentDate.getMonth();
 active(currentMonth);//傳參數(shù)月份
 //創(chuàng)建日歷上下翻月
 prev.onclick = function () {
 active(--currentMonth);
 };
 next.onclick = function () {
 active(++currentMonth);
 };
 }
 //動(dòng)態(tài)創(chuàng)建日歷上面日期，變包裝成方法
 function active(m) {
 oUl.innerHTML = ''; //切忌一定要把這個(gè)內(nèi)容去掉，要不然會(huì)點(diǎn)一次翻頁(yè)都在日歷下面依次顯示出來(lái)
 var activeDate = new Date(currentYear, m, 1); //外面?zhèn)鬟M(jìn)來(lái)的不斷變化的日期對(duì)象
 var year = activeDate.getFullYear();
 var month = activeDate.getMonth(); //把當(dāng)前的月份保存下來(lái)只是為了給title獲取月份
 content.innerHTML = year + '年' + (month + 1) + '月';
 //創(chuàng)建日歷上面的日期行數(shù)
 var n = 1 - activeDate.getDay();
 if (n == 1) {
 n = -6;
 } //為了日歷更友好的顯示三個(gè)月，讓用戶看的更明白。
 activeDate.setDate(n); //如果n為負(fù)數(shù)，則減少月份.在用這個(gè)月最后一天減去這個(gè)值就可以獲得日歷從哪天開(kāi)始的。
 for (var i = 0; i < 42; i++) {
 var oLi = document.createElement('li');
 oUl.appendChild(oLi);
 var date = activeDate.getDate(); //返回日期1-31號(hào)
 oLi.innerHTML = date;
 oLi.dateValue = year + "-" + (activeDate.getMonth() + 1) + "-" + date; //這里必須是activeDate.getMonth()+1，不能用m+1。因?yàn)檫@個(gè)是一直變化的。要不然日歷不管點(diǎn)哪天都是屬于當(dāng)前月份的。
 oLi.onclick = function () {
  ele.value = this.dateValue;//文本框獲取的年月日
  document.body.removeChild(oDiv); //獲取到年月日，日歷取消
  oDiv = null;
 };
 if (activeDate.getMonth() != month) {
  oLi.style.color = "#ccc"; //不是本月的天數(shù)顏色變成灰色 
 }
 //切忌下面這個(gè)增加天數(shù)語(yǔ)句，一定要判斷完上面是不是本月的天數(shù)，然后在添加這條增加語(yǔ)句，要不然會(huì)出現(xiàn)錯(cuò)誤。
 activeDate.setDate(date + 1); //如果超出該月份應(yīng)有的天數(shù)則增加月份
 }
 }
 }
 function offset(ele) {
 var l = ele.offsetLeft;
 var t = ele.offsetTop;
 var p = ele.offsetParent;
 while (p) {
 if (window.navigator.userAgent.indexOf("MSIE 8") > -1) {
 l += p.offsetLeft;
 t += p.offsetTop;
 } else {
 l += p.offsetLeft + p.clientLeft;
 t += p.offsetTop + p.clientTop;
 }
 p = p.offsetParent;
 }
 return {
 left: l,
 top: t
 }
 }
</script>