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原生js如何实现日期选择插件

发布时间：2020-07-22 16:49:56 作者：小猪
来源：亿速云 阅读：154

小编这次要给大家分享的是原生js如何实现日期选择插件，文章内容丰富，感兴趣的小伙伴可以来了解一下，希望大家阅读完这篇文章之后能够有所收获。

最近公司项目告一段落，想着写个小玩意打发下上班时间，就用js很粗糙的实现了下日期选择插件。间间断断历时1天多，实现了选择日期的功能，从写完的整体代码来看，耦合度还是蛮高的，我觉得还是我对js中的原型继承方式理解不深刻，一定有更优雅的方式再优化下这份粗糙的代码，各位前端小伙伴们在看完我的代码后请麻烦指出其中实现的不好的地方，有批评指正让我有动力继续写博客嘛！

先说下这个插件的功能：功能很简单，目前只实现了选择一个日期（当然可以赋初始值，默认是当前日期），选择跨月日期时，会有一个粗糙的动画效果，效果图如下：

原生js如何实现日期选择插件

然后，说下我写这个插件思路：

      1.插件整体是以function Dt作为基类，通过choose方法调用，如：$('#txtDt').choose({value: '2018/8/1'});$方法用来选择要传入选择日期的文本控件。插件由head、content、foot3部分组成，head：选择上月、下月、昨日、明日和显示当前选择日期；centent：显示日期列表；foot：关闭

      2.Dt中render方法会更新属性(年、月、日.....)

      3.跨月实现的动画过渡主要通过content中的3个月列表（上月【隐藏】、当月、下月【隐藏】）分别替换来实现，比如显示下月，只需要将下月列表逐步移动到显示区域，将当月移动到上月，再将原上月列表删除，再将最新的下月列表插入到当月之后。思路很简单，小伙伴们看代码就能一目了然了。只是，我对自己实现的上月、下月、昨日和明日的方法很厌恶，代码严重耦合，美观性很差，如果有小伙伴有更好的解决办法，一定要告诉我。

话不多说，附上所有代码：

html部分：  

<!DOCTYPE html>
<html>
 <head>
 <meta http-equiv="content-type" content="text/html" charset="utf-8" />
 <title>日期插件</title>
 <style>
 </style>
 </head>
 <body>
 <div >
 <input id="txtDt" type="text" />
 </div>
 </body>
</html>

js部分：

(function (){
 function Dt(selector) {
 return new Dt.fn.init(selector);
 }
 
 Dt.fn = Dt.prototype = {
 constructor: Dt,
 initialize: false,
 init: function (selector) {
 if(selector.indexOf('#') > -1){
  this[0] = document.getElementById(selector.substring(1));
 } else {
  var aryEle = document.querySelectorAll(selector);
  for(var i = 0; i < aryEle.length; i++){
  this[i] = aryEle[i];
  }
 }
 return this;
 },
 render: function(opt) {
 /*
  match hour
  0 1 2 3 4 5 6 7 8 9
  00 01 02 03 04 05 06 07 08 09
  10 11 12 13 14 15 16 17 18 19
  20 21 22 23
  \d
  [01]\d | 2[0-3]
  match minute second
  0 1 2 3 4 5 6 7 8 9
  00 01 02 03 04 05 06 07 08 09
  10 11 12 13 14 15 16 17 18 19
  20 ...     29
  ...
  50 ...     59
  \d
  [0-5]\d
 */
 var regExpDt = /^\d{4}([-/]&#63;)\d{1,2}\1\d{1,2}(&#63;:\s+(&#63;:[01]&#63;\d)|(&#63;:2[0-3])\:[0-5]&#63;\d\:[0-5]&#63;\d)&#63;$/;
 if(Object.prototype.toString.apply(opt.value) == '[object Date]') {
  this.value = opt.value.getFullYear() + '/' + (opt.value.getMonth() + 1) + '/' + opt.value.getDate();
  this.date = opt.value;
  this.initialize = true;
 } else if(Object.prototype.toString.apply(opt.value) == '[object String]') {
  this.value = regExpDt.test(opt.value) &#63; opt.value : '';
  this.date = new Date(opt.value);
  this.initialize = true;
 } else {
  this.value = '';
  this.date = new Date();
 }
 this.year = this.date.getFullYear();
 this.month = this.date.getMonth() + 1;
 this.day = this.date.getDate();
 this.hour = this.date.getHours();
 this.minute = this.date.getMinutes();
 this.second = this.date.getSeconds();
 this.week = this.date.getDay() == 0 &#63; 7 : this.date.getDay();
 this.getFirstdateInMonth = function() {
  return new Date(this.date.getFullYear(), this.date.getMonth(), 1);
 }
 this.getCalDate = function(dt, type, num) {
  var dtRtn = new Date();
  dtRtn = dt;
  switch (type) {
  case 'Y':
  dtRtn = new Date(dt.getFullYear() + num, dt.getMonth(), dt.getDate());
  break;
  case 'M':
  dtRtn = new Date(dt.getFullYear(), dt.getMonth() + num, dt.getDate());
  break;
  case 'D':
  dtRtn = new Date(dt.getFullYear(), dt.getMonth(), dt.getDate() + num);
  break;
  default:
  break;
  }
  return dtRtn;
 }
 this.getLastdateInMonth = function() {
  var dtRtn = new Date();
  var dtFirstdateInNextmonth = new Date(this.date.getFullYear(), this.date.getMonth() + 1, 1);
  dtRtn = this.getCalDate(dtFirstdateInNextmonth, 'D', -1);
  return dtRtn;
 }
 this.count = this.getLastdateInMonth().getDate();
 this.formatDate = function(type) {
  var strRtn = '',
  strYear = '',
  strMonth = '',
  strDay = '';
  strYear = this.date.getFullYear();
  strMonth = (this.date.getMonth() + 1).toString().length < 2 &#63; '0' + (this.date.getMonth() + 1) : (this.date.getMonth() + 1);
  strDay = this.date.getDate().toString().length < 2 &#63; '0' + this.date.getDate() : this.date.getDate();
  switch(type.toString().toUpperCase()) {
  case 'YYYYMMDD':
  strRtn = strYear + strMonth + strDay;
  break;
  case 'YYYY/MM/DD':
  strRtn = strYear + '/' + strMonth + '/' + strDay;
  break;
  case 'YYYY-MM-DD':
  strRtn = strYear + '-' + strMonth + '-' + strDay;
  break;
  default:
  strRtn = strYear + '/' + strMonth + '/' + strDay;
  break;
  }
  return strRtn;
 }
 return this;
 }
 };
 Dt.fn.init.prototype = Dt.fn;
 
 Dt.fn.extend = Dt.extend = function () {
 var len = arguments.length,
  i = 1,
  j,
  objRtn = arguments[0];
 for(;i < len;i++){
 for(var j in arguments[i]){
  objRtn[j] = arguments[i][j];
 }
 }
 return objRtn;
 }
 
 Dt.fn.create = Dt.create = function() {
 this.render(arguments[0]);
 createDateList.call(this);
 }
 
 function insertAfter(target, node) {
 //node.style.left = target.offsetLeft + "px";
 if(target.parentNode.children.length == 1) {
 target.parentNode.appendChild(node);
 } else {
 target.parentNode.insertBefore(node, target.nextSibling);
 }
 }
 
 function setStyle(target, opts) {
 for(var item in opts){
 target.style[item] = opts[item];
 }
 }
 
 function createHeader() {
 var me = this;
 var divHeader = document.createElement('div');
 setStyle(divHeader, {
 height: '30px',
 borderBottom: '1px solid silver',
 position: 'relative',
 backgroundColor: 'rgba(214,222,247,1)'
 });
 var btnLastMonth = document.createElement('div');
 btnLastMonth.title = "上月";
 btnLastMonth.onclick = function() {
 var speed_last_month = 1;
 var speed_current_month = 1;
 var b_last_month = false;
 var b_current_month = false;
 var next_month_left = parseInt(me.content.nextMonth.component.style.left);
 var timer = setInterval(function() {
  if(!b_last_month) {
  if(parseInt(me.Container.children[1].style.left) < 0) {
  me.Container.children[1].style.left = parseInt(me.Container.children[1].style.left) + Math.floor(5 / speed_last_month) + 'px';
  speed_last_month += 0.01;
  } else {
  b_last_month = !b_last_month;
  }
  }
  if(!b_current_month) {
  if(parseInt(me.Container.children[2].style.left) < next_month_left) {
  me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) + Math.floor(5 / speed_current_month) + 'px';
  speed_current_month += 0.01;
  } else {
  b_current_month = !b_current_month;
  }
  }
  if(b_last_month && b_current_month) {
  clearInterval(timer);
  me.date = me.getFirstdateInMonth();
  me.date = me.getCalDate(me.date, 'M', -1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.removeChild(me.Container.children[3]);
  me.Container.insertBefore(objContent.lastMonth.component, me.Container.children[0].nextSibling);
  me.Container.replaceChild(objContent.nextMonth.component, me.Container.children[3]);
  me.Container.children[2].style.left = 0;
  me.Container.children[2].style.position = 'absolute';
  me.Container.children[3].style.left = '250px';
  me.Container.children[3].style.position = 'relative';
  me.content.nextMonth = objContent.nextMonth;
  me.content.nextMonth.left = 250;
  me.content.currentMonth = me.content.lastMonth;
  me.content.currentMonth.left = 0;
  me.content.lastMonth = objContent.lastMonth;
  me.content.lastMonth.left = -275;
  me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
  me[0].value = me.formatDate(me.getFirstdateInMonth());
  }
 }, 10);
 }
 setStyle(btnLastMonth, {
 cursor: 'pointer',
 height: '30px',
 border: 0,
 display: 'inline',
 width: '30px',
 position: 'absolute',
 left: 0
 });
 var canvas_last_month = document.createElement('canvas');
 if(canvas_last_month.getContext('2d')) {
 canvas_last_month.height = 30;
 canvas_last_month.width = 30;
 var ctx = canvas_last_month.getContext('2d');
 ctx.beginPath();
 ctx.fillStyle = 'rgba(214,222,247,1)';
 ctx.fillRect(0, 0, 30, 30);
 ctx.strokeStyle = 'rgba(251,251,251,1)';
 ctx.fillStyle = 'rgba(251,251,251,1)';
 ctx.lineWidth = 1;
 ctx.moveTo(7, 0);
 ctx.lineTo(15, 0);
 ctx.lineTo(8, 15);
 ctx.lineTo(15, 30);
 ctx.lineTo(7, 30);
 ctx.lineTo(0, 15);
 ctx.lineTo(7, 0);
 
 ctx.moveTo(22, 0);
 ctx.lineTo(30, 0);
 ctx.lineTo(23, 15);
 ctx.lineTo(30, 30);
 ctx.lineTo(22, 30);
 ctx.lineTo(15, 15);
 ctx.lineTo(22, 0);
 ctx.fill();
 ctx.stroke();
 btnLastMonth.appendChild(canvas_last_month);
 } else {
 btnLastMonth.innerHTML = "<<";
 setStyle(btnLastMonth, {
  backgroundColor: 'rgba(214,222,247,1)'
 });
 }
 
 var btnLastDay = document.createElement('div');
 btnLastDay.title = "昨日";
 btnLastDay.onclick = function() {
 if(me.getCalDate(me.date, 'D', -1).getMonth() + 1 == me.month) {
  me.date = me.getCalDate(me.date, 'D', -1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[2]);
  me.header.children[2].innerHTML = me.formatDate(me.date);
  me[0].value = me.formatDate(me.date);
 } else {
  var speed_last_month = 1;
  var speed_current_month = 1;
  var b_last_month = false;
  var b_current_month = false;
  var next_month_left = parseInt(me.content.nextMonth.component.style.left);
 
  me.date = me.getCalDate(me.date, 'D', -1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[1]);
  me.Container.children[1].style.left = '-275px';
  var timer = setInterval(function() {
  if(!b_current_month) {
  if(parseInt(me.Container.children[2].style.left) < next_month_left) {
  me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) + Math.floor(5 / speed_current_month) + 'px';
  speed_current_month += 0.01;
  } else {
  b_current_month = !b_current_month;
  }
  }
  if(!b_last_month) {
  if(parseInt(me.Container.children[1].style.left) < 0) {
  me.Container.children[1].style.left = parseInt(me.Container.children[1].style.left) + Math.floor(5 / speed_last_month) + 'px';
  speed_last_month += 0.01;
  } else {
  b_last_month = !b_last_month;
  }
  }
  if(b_last_month && b_current_month) {
  clearInterval(timer);
  me.Container.removeChild(me.Container.children[3]);
  me.Container.insertBefore(objContent.lastMonth.component, me.Container.children[0].nextSibling);
  me.Container.replaceChild(objContent.nextMonth.component, me.Container.children[3]);
  me.Container.children[2].style.left = 0;
  me.Container.children[2].style.position = 'absolute';
  me.Container.children[3].style.left = '250px';
  me.Container.children[3].style.position = 'relative';
  me.content.nextMonth = objContent.nextMonth;
  me.content.nextMonth.left = 250;
  me.content.currentMonth = me.content.lastMonth;
  me.content.currentMonth.left = 0;
  me.content.lastMonth = objContent.lastMonth;
  me.content.lastMonth.left = -275;
  me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
  me[0].value = me.formatDate(me.getFirstdateInMonth());
  }
  }, 10);
 }
 }
 setStyle(btnLastDay, {
 cursor: 'pointer',
 height: '30px',
 width: '30px',
 display: 'inline',
 position: 'absolute',
 left: '31px'
 });
 var canvas_last_day = document.createElement('canvas');
 if(canvas_last_day.getContext('2d')) {
 canvas_last_day.height = 30;
 canvas_last_day.width = 30;
 var ctx = canvas_last_day.getContext('2d');
 ctx.beginPath();
 ctx.fillStyle = 'rgba(214,222,247,1)';
 ctx.fillRect(0, 0, 30, 30);
 ctx.strokeStyle = 'rgba(251,251,251,1)';
 ctx.fillStyle = 'rgba(251,251,251,1)';
 ctx.lineWidth = 1;
 ctx.moveTo(11, 0);
 ctx.lineTo(19, 0);
 ctx.lineTo(12, 15);
 ctx.lineTo(19, 30);
 ctx.lineTo(11, 30);
 ctx.lineTo(4, 15);
 ctx.lineTo(11, 0);
 ctx.fill();
 ctx.stroke();
 btnLastDay.appendChild(canvas_last_day);
 } else {
 btnLastDay.innerHTML = "<";
 setStyle(btnLastDay, {
  backgroundColor: 'rgba(214,222,247,1)'
 });
 }
 
 var spanDt = document.createElement('div');
 spanDt.innerHTML = this.formatDate(this.date);
 setStyle(spanDt, {
 position: 'absolute',
 margin: '0 auto',
 top: '5px',
 right: 0,
 bottom: 0,
 left: 0,
 width: '100px'
 });
 
 var btnTomorrow = document.createElement('div');
 btnTomorrow.title = "明日";
 btnTomorrow.onclick = function() {
 if(me.getCalDate(me.date, 'D', 1).getMonth() + 1 == me.month) {
  me.date = me.getCalDate(me.date, 'D', 1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[2]);
  me.Container.children[2].style.left = 0;
  me.header.children[2].innerHTML = me.formatDate(me.date);
  me[0].value = me.formatDate(me.date);
 } else {
  var speed_next_month = 1;
  var speed_current_month = 1;
  var b_next_month = false;
  var b_current_month = false;
  var last_month_left = parseInt(me.content.lastMonth.component.style.left);
 
  me.date = me.getCalDate(me.date, 'D', 1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[3]);
  me.Container.children[3].style.left = '250px';
  var timer = setInterval(function() {
  if(!b_current_month) {
  if(parseInt(me.Container.children[2].style.left) > last_month_left) {
  me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) - Math.floor(5 / speed_current_month) + 'px';
  speed_current_month += 0.01;
  } else {
  b_current_month = !b_current_month;
  }
  }
  if(!b_next_month) {
  if(parseInt(me.Container.children[3].style.left) > 0) {
  me.Container.children[3].style.left = parseInt(me.Container.children[3].style.left) - Math.floor(5 / speed_next_month) + 'px';
  speed_next_month += 0.01;
  } else {
  b_next_month = !b_next_month;
  }
  }
  if(b_next_month && b_current_month) {
  clearInterval(timer);
  me.Container.removeChild(me.Container.children[1]);
  me.Container.insertBefore(objContent.nextMonth.component, me.Container.children[2].nextSibling);
  me.Container.replaceChild(objContent.lastMonth.component, me.Container.children[1]);
  me.Container.children[2].style.left = 0;
  me.Container.children[2].style.position = 'absolute';
  me.Container.children[3].style.left = '250px';
  me.Container.children[3].style.position = 'relative';
  me.content.nextMonth = objContent.nextMonth;
  me.content.nextMonth.left = 250;
  me.content.currentMonth = me.content.nextMonth;
  me.content.currentMonth.left = 0;
  me.content.lastMonth = objContent.lastMonth;
  me.content.lastMonth.left = -275;
  me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
  me[0].value = me.formatDate(me.getFirstdateInMonth());
  }
  }, 10);
 }
 }
 setStyle(btnTomorrow, {
 cursor: 'pointer',
 height: '30px',
 width: '30px',
 display: 'inline',
 position: 'absolute',
 right: '31px'
 });
 
 var canvas_tomorrow = document.createElement('canvas');
 if(canvas_tomorrow.getContext('2d')) {
 canvas_tomorrow.height = 30;
 canvas_tomorrow.width = 30;
 var ctx = canvas_tomorrow.getContext('2d');
 ctx.beginPath();
 ctx.fillStyle = 'rgba(214,222,247,1)';
 ctx.fillRect(0, 0, 30, 30);
 ctx.strokeStyle = 'rgba(251,251,251,1)';
 ctx.fillStyle = 'rgba(251,251,251,1)';
 ctx.lineWidth = 1;
 ctx.moveTo(11, 0);
 ctx.lineTo(19, 0);
 ctx.lineTo(26, 15);
 ctx.lineTo(19, 30);
 ctx.lineTo(11, 30);
 ctx.lineTo(18, 15);
 ctx.lineTo(11, 0);
 ctx.fill();
 ctx.stroke();
 btnTomorrow.appendChild(canvas_tomorrow);
 } else {
 btnTomorrow.innerHTML = ">";
 setStyle(btnTomorrow, {
  backgroundColor: 'rgba(214,222,247,1)'
 });
 }
 
 var btnNextMonth = document.createElement('div');
 btnNextMonth.title = "下月";
 btnNextMonth.onclick = function() {
 var speed_next_month = 1;
 var speed_current_month = 1;
 var b_next_month = false;
 var b_current_month = false;
 var last_month_left = parseInt(me.content.lastMonth.component.style.left);
 var timer = setInterval(function() {
  if(!b_next_month) {
  if(parseInt(me.Container.children[3].style.left) > 0) {
  me.Container.children[3].style.left = parseInt(me.Container.children[3].style.left) - Math.floor(5 / speed_next_month) + 'px';
  speed_next_month += 0.01;
  } else {
  b_next_month = !b_next_month;
  }
  }
  if(!b_current_month) {
  if(parseInt(me.Container.children[2].style.left) > last_month_left) {
  me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) - Math.floor(5 / speed_current_month) + 'px';
  speed_current_month += 0.01;
  } else {
  b_current_month = !b_current_month;
  }
  }
  if(b_next_month && b_current_month) {
  clearInterval(timer);
  me.date = me.getFirstdateInMonth();
  me.date = me.getCalDate(me.date, 'M', 1);
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.removeChild(me.Container.children[1]);
  me.Container.insertBefore(objContent.nextMonth.component, me.Container.children[2].nextSibling);
  me.Container.replaceChild(objContent.lastMonth.component, me.Container.children[1]);
  me.Container.children[1].style.left = '-275px';
  me.Container.children[1].style.position = 'absolute';
  me.Container.children[2].style.left = '0';
  me.Container.children[2].style.position = 'absolute';
  me.content.lastMonth = objContent.lastMonth;
  me.content.lastMonth.left = -275;
  me.content.currentMonth = me.content.nextMonth;
  me.content.currentMonth.left = 0;
  me.content.nextMonth = objContent.nextMonth;
  me.content.nextMonth.left = 250;
  me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
  me[0].value = me.formatDate(me.getFirstdateInMonth());
  }
 }, 10);
 }
 setStyle(btnNextMonth, {
 cursor: 'pointer',
 height: '30px',
 border: 0,
 display: 'inline',
 width: '30px',
 position: 'absolute',
 right: 0
 });
 var canvas_next_month = document.createElement('canvas');
 if(canvas_next_month.getContext('2d')) {
 canvas_next_month.height = 30;
 canvas_next_month.width = 30;
 var ctx = canvas_next_month.getContext('2d');
 ctx.beginPath();
 ctx.fillStyle = 'rgba(214,222,247,1)';
 ctx.fillRect(0, 0, 30, 30);
 ctx.strokeStyle = 'rgba(251,251,251,1)';
 ctx.fillStyle = 'rgba(251,251,251,1)';
 ctx.lineWidth = 1;
 ctx.moveTo(0, 0);
 ctx.lineTo(8, 0);
 ctx.lineTo(15, 15);
 ctx.lineTo(8, 30);
 ctx.lineTo(0, 30);
 ctx.lineTo(7, 15);
 ctx.lineTo(0, 0);
 
 ctx.moveTo(15, 0);
 ctx.lineTo(23, 0);
 ctx.lineTo(30, 15);
 ctx.lineTo(23, 30);
 ctx.lineTo(15, 30);
 ctx.lineTo(22, 15);
 ctx.lineTo(15, 0);
 ctx.fill();
 ctx.stroke();
 btnNextMonth.appendChild(canvas_next_month);
 } else {
 btnNextMonth.innerHTML = ">>";
 setStyle(btnNextMonth, {
  backgroundColor: 'rgba(214,222,247,1)'
 });
 }
 divHeader.appendChild(btnLastMonth);
 divHeader.appendChild(btnLastDay);
 divHeader.appendChild(spanDt);
 divHeader.appendChild(btnTomorrow);
 divHeader.appendChild(btnNextMonth);
 return divHeader;
 }
 
 function createContent() {
 var realDate = this.date;
 var objContent = {
 lastMonth: {
  scope: function() {
  this.date = this.getFirstdateInMonth();
  this.date = this.getCalDate(this.date, 'M', -1);
  this.render({value: this.date});
  },
  current: true,
  left: -275,
  component: null
 },
 currentMonth: {
  scope: function() {
  if(this.initialize) {
  this.date = realDate;
  } else {
  this.date = new Date();
  }
  this.render({value: this.date});
  },
  current: true,
  left: 0,
  component: null
 },
 nextMonth: {
  scope: function() {
  this.date = this.getFirstdateInMonth();
  this.date = this.getCalDate(this.date, 'M', 1);
  this.render({value: this.date});
  },
  current: false,
  left: 250,
  component: null
 }
 };
 for(var item in objContent) {
 objContent[item].scope.call(this);
 objContent[item].year = this.year;
 objContent[item].month = this.month;
 var divContent = document.createElement('div');
 setStyle(divContent, {
  height: '250px',
  position: objContent[item].current &#63; 'absolute' : 'relative',
  left: objContent[item].left + 'px'
 });
 var tbl = document.createElement('table'),
  row_obj,
  cell_obj,
  row_num = tbl.rows.length,
  cell_num = 0;
 setStyle(tbl, {
  width: '100%'
 });
 row_obj = tbl.insertRow(row_num);
 setStyle(row_obj, {
  backgroundColor: 'rgba(214,222,247,1)'
 });
 row_obj.setAttribute('head', true);
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "一";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "二";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "三";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "四";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "五";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "六";
 cell_obj.style.width = "35px";
 cell_obj = row_obj.insertCell(cell_num++);
 cell_obj.innerHTML = "日";
 cell_obj.style.width = "35px";
 var dtFirst = this.getFirstdateInMonth();
 var aryDate = [];
 var aryWeekDate = new Array(7);
 for (var i = 0; i < this.count; i++) {
  if (i == 0) {
  aryWeekDate = new Array(7);
  aryWeekDate[(dtFirst.getDay() == 0 &#63; 7 : dtFirst.getDay()) - 1] = dtFirst;
  var weekNumberForFirstDay = dtFirst.getDay() == 0 &#63; 7 : dtFirst.getDay();
  var d = 0;
  while(weekNumberForFirstDay > 1) {
  aryWeekDate[weekNumberForFirstDay - 2] = this.getCalDate(dtFirst, 'D', -1 - d);
  weekNumberForFirstDay--;
  d++;
  }
  if (dtFirst.getDay() == 0) {
  aryDate.push(aryWeekDate);
  }
  } else {
  if (i == this.count - 1 && this.getCalDate(dtFirst, 'D', i).getDay() != 0) {
  var weekNumberForNextDay = this.getCalDate(dtFirst, 'D', i).getDay();
  var n = 0;
  if(weekNumberForNextDay == 1){
  aryWeekDate = new Array(7);
  }
  while(weekNumberForNextDay < 8){
  aryWeekDate[weekNumberForNextDay - 1] = this.getCalDate(dtFirst, 'D', i + n);
  weekNumberForNextDay++;
  n++;
  }
  aryDate.push(aryWeekDate);
  }
  if (this.getCalDate(dtFirst, 'D', i).getDay() == 1) {
  aryWeekDate = new Array(7);
  aryWeekDate[0] = this.getCalDate(dtFirst, 'D', i);
  } else if (this.getCalDate(dtFirst, 'D', i).getDay() == 0) {
  aryWeekDate[6] = this.getCalDate(dtFirst, 'D', i);
  aryDate.push(aryWeekDate);
  } else {
  aryWeekDate[this.getCalDate(dtFirst, 'D', i).getDay() - 1] = this.getCalDate(dtFirst, 'D', i);
  }
  }
 }
 for (var j = 0; j < aryDate.length; j++) {
  row_obj = tbl.insertRow(tbl.rows.length);
  row_obj.style.height = '34px';
  cell_num = 0;
  for (var k = 0; k < aryDate[j].length; k++) {
  cell_obj = row_obj.insertCell(cell_num++);
  cell_obj.innerHTML = aryDate[j][k] != undefined &#63; aryDate[j][k].getDate() : '';
  cell_obj.style.width = "30px";
  cell_obj.style.cursor = "default";
  cell_obj.style.borderRadius = '17px';
  // set style for today
  if(aryDate[j][k] != undefined
  && this.month == new Date().getMonth() + 1
  && this.year == new Date().getFullYear()
  && aryDate[j][k].getDate() == new Date().getDate()) {
  cell_obj.style.border = '1px solid silver';
  }
  // set style for days of other month
  if(aryDate[j][k] != undefined && this.month != aryDate[j][k].getMonth() + 1) {
  cell_obj.style.color = 'silver';
  cell_obj.setAttribute('no-current-month', true);
  if(aryDate[j][k].getFullYear() < this.year) {
  cell_obj.setAttribute('last-month', true);
  } else if(aryDate[j][k].getFullYear() == this.year) {
  if(aryDate[j][k].getMonth() + 1 < this.month) {
   cell_obj.setAttribute('last-month', true);
  } else {
   cell_obj.setAttribute('next-month', true);
  }
  } else {
  cell_obj.setAttribute('next-month', true);
  }
  }
  if(aryDate[j][k] != undefined && this.year == aryDate[j][k].getFullYear()
  && this.month == aryDate[j][k].getMonth() + 1
  && this.day == aryDate[j][k].getDate()) {
  cell_obj.style.color = 'white';
  cell_obj.style.backgroundColor = 'rgba(245,169,244,1)';
  cell_obj.setAttribute('current-date', true);
  }
  cell_obj.onmouseover = function () {
  this.style.backgroundColor = 'rgba(245,169,244,1)';
  this.style.color = 'white';
  }
  cell_obj.onmouseout = function () {
  if(!this.getAttribute('current-date')) {
  this.style.backgroundColor = "white";
  this.style.color = 'black';
  } else {
  this.style.color = 'white';
  }
  if(this.getAttribute('no-current-month')) {
  this.style.color = 'silver';
  }
  }
  }
 }
 var me = this;
 tbl.onclick = function (e) {
  var e = (e || event.srcElement).target;
  if(e.tagName.toString().toLowerCase() == 'td' && !e.parentNode.getAttribute('head')) {
  if(!e.getAttribute('no-current-month')) {
  me.date = new Date(me.date.getFullYear(), me.date.getMonth(), parseInt(e.innerHTML));
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[2]);
  me.header.children[2].innerHTML = me.formatDate(me.date);
  me[0].value = me.formatDate(me.date);
  } else {
  if(e.getAttribute('last-month')) {
  var speed_last_month = 1;
  var speed_current_month = 1;
  var b_last_month = false;
  var b_current_month = false;
  var next_month_left = parseInt(me.content.nextMonth.component.style.left);
  if(me.date.getMonth() == 0) {
   me.date = new Date(me.date.getFullYear() - 1, 11, parseInt(e.innerHTML));
  } else {
   me.date = new Date(me.date.getFullYear(), me.date.getMonth() - 1, parseInt(e.innerHTML));
  }
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[1]);
  me.Container.children[1].style.left = '-275px';
  var timer = setInterval(function() {
   if(!b_current_month) {
   if(parseInt(me.Container.children[2].style.left) < next_month_left) {
   me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) + Math.floor(5 / speed_current_month) + 'px';
   speed_current_month += 0.01;
   } else {
   b_current_month = !b_current_month;
   }
   }
   if(!b_last_month) {
   if(parseInt(me.Container.children[1].style.left) < 0) {
   me.Container.children[1].style.left = parseInt(me.Container.children[1].style.left) + Math.floor(5 / speed_last_month) + 'px';
   speed_last_month += 0.01;
   } else {
   b_last_month = !b_last_month;
   }
   }
   if(b_last_month && b_current_month) {
   clearInterval(timer);
   me.Container.removeChild(me.Container.children[3]);
   me.Container.insertBefore(objContent.lastMonth.component, me.Container.children[0].nextSibling);
   me.Container.replaceChild(objContent.nextMonth.component, me.Container.children[3]);
   me.Container.children[2].style.left = 0;
   me.Container.children[2].style.position = 'absolute';
   me.Container.children[3].style.left = '250px';
   me.Container.children[3].style.position = 'relative';
   me.content.nextMonth = objContent.nextMonth;
   me.content.nextMonth.left = 250;
   me.content.currentMonth = me.content.lastMonth;
   me.content.currentMonth.left = 0;
   me.content.lastMonth = objContent.lastMonth;
   me.content.lastMonth.left = -275;
   me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
   me[0].value = me.formatDate(me.getFirstdateInMonth());
   }
  }, 10);
  } else {
  var speed_next_month = 1;
  var speed_current_month = 1;
  var b_next_month = false;
  var b_current_month = false;
  var last_month_left = parseInt(me.content.lastMonth.component.style.left);
  if(me.date.getMonth() == 11) {
   me.date = new Date(me.date.getFullYear() + 1, 0, parseInt(e.innerHTML));
  } else {
   me.date = new Date(me.date.getFullYear(), me.date.getMonth() + 1, parseInt(e.innerHTML));
  }
  me.render({value: me.date});
  var objContent = createContent.call(me);
  me.Container.replaceChild(objContent.currentMonth.component, me.Container.children[3]);
  me.Container.children[3].style.left = '250px';
  var timer = setInterval(function() {
   if(!b_current_month) {
   if(parseInt(me.Container.children[2].style.left) > last_month_left) {
   me.Container.children[2].style.left = parseInt(me.Container.children[2].style.left) - Math.floor(5 / speed_current_month) + 'px';
   speed_current_month += 0.01;
   } else {
   b_current_month = !b_current_month;
   }
   }
   if(!b_next_month) {
   if(parseInt(me.Container.children[3].style.left) > 0) {
   me.Container.children[3].style.left = parseInt(me.Container.children[3].style.left) - Math.floor(5 / speed_next_month) + 'px';
   speed_next_month += 0.01;
   } else {
   b_next_month = !b_next_month;
   }
   }
   if(b_next_month && b_current_month) {
   clearInterval(timer);
   me.Container.removeChild(me.Container.children[1]);
   me.Container.insertBefore(objContent.nextMonth.component, me.Container.children[2].nextSibling);
   me.Container.replaceChild(objContent.lastMonth.component, me.Container.children[1]);
   me.Container.children[2].style.left = 0;
   me.Container.children[2].style.position = 'absolute';
   me.Container.children[3].style.left = '250px';
   me.Container.children[3].style.position = 'relative';
   me.content.nextMonth = objContent.nextMonth;
   me.content.nextMonth.left = 250;
   me.content.currentMonth = me.content.nextMonth;
   me.content.currentMonth.left = 0;
   me.content.lastMonth = objContent.lastMonth;
   me.content.lastMonth.left = -275;
   me.header.children[2].innerHTML = me.formatDate(me.getFirstdateInMonth());
   me[0].value = me.formatDate(me.getFirstdateInMonth());
   }
  }, 10);
  }
  }
  }
 }
 divContent.appendChild(tbl);
 objContent[item].component = divContent;
 }
 // reset date to current month
 this.date = realDate;
 this.render({value: this.date});
 return objContent;
 }
 
 function createFooter() {
 var me = this;
 var divFooter = document.createElement('div');
 setStyle(divFooter, {
 height: '30px',
 width: '100%',
 position: 'absolute',
 bottom: 0
 });
 var divContainer = document.createElement('div');
 setStyle(divContainer, {
 position: 'relative',
 width: '95%',
 height: '30px'
 });
 var btnClose= document.createElement('div');
 setStyle(btnClose, {
 position: 'absolute',
 width: '100%',
 top: 0,
 right: 0,
 bottom: '5px',
 left: 0,
 cursor: 'pointer',
 border: '1px solid silver',
 borderRadius: '4px',
 backgroundColor: 'rgba(214,222,247,1)',
 color: 'white',
 margin: '0 5px'
 });
 btnClose.innerHTML = '关闭';
 btnClose.onclick = function() {
 setStyle(me.Container, {
  display: 'none'
 });
 }
 divContainer.appendChild(btnClose);
 divFooter.appendChild(divContainer);
 return divFooter;
 }
 
 function createDateList() {
 this.Container = document.createElement('div');
 setStyle(this.Container, {
 position: 'relative',
 marginTop: '5px',
 borderRadius: '3px',
 width: '250px',
 height: '320px',
 border: '1px solid silver',
 //float: 'left',
 textAlign: 'center',
 display: 'none',
 overflow: 'hidden'
 });
 
 this.header = createHeader.call(this);
 this.content = createContent.call(this);
 this.footer = createFooter.call(this);
 this.Container.appendChild(this.header);
 for(var item in this.content) {
 this.Container.appendChild(this.content[item].component);
 }
 this.initialize = true;
 this.Container.appendChild(this.footer);
 insertAfter(this[0], this.Container);
 }
 
 Dt.fn.choose = function (options) {
 options = options || {};
 var defaults = {
 value: new Date()
 };
 var opt = this.extend({}, defaults, options);
 this.create(opt);
 this[0].onfocus = function() {
 this.parentNode.children[1].style.display = '';
 }
 }
 
 var $ = function (selector) {
 return Dt(selector);
 }
 
 window.$ = $;
 })()
 
 window.onload = function () {
 $('#txtDt').choose();
 }

欢迎各位小伙伴批评指正！

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推荐阅读：
  1. 时间日期选择插件
  2. 日期选择插件

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