//调用方法，后面回调函数返回的是当前选择的日期 
calender('#calend').init(function(date){ 
 this.innerHTML = date 
});

//具体参数说明 
//如果需要传入参数，第一个为json，第二个为回调函数 
//下面是format格式化显示格式类型，有如下几种： 
//yyyy为年数  
//大写M为月数  
//d为几号  
//h为小时  
//小写m为分钟  
//s为秒数  
//q为季度  
//小写e，为数字星期格式  
//大写E，为中文星期格式  
//举例：'yyyy年MM月dd日','yyyy-MM-dd','yyyy','MM','e','dd E' 
//注意：以上获取时间如果是个位数则返回个位数，比如7月，则返回7，如果需要返回07，参数可以写成这样“MM”，其它同理，由于时分秒功能还没有添加，默认获取当前时分秒  
calender('#calend').init({ 
 date : [2015,12,12], //设置默认显示年月日，默认当前年月日  
 format : 'yyyy-MM-dd', //设置显示格式 
 button : false //是否显示按钮 
 left : 0, //追加left，默认0
 top :0, //追加top，默认0
 onload : function(){ } //初始化完成执行，this为当前创建的日历对象 
},function(date){ 
 //回调函数 
 this.innerHTML = date 
});

.containter {
 width:320px;
 margin:auto
}
.calender-wrap {
 -webkit-animation:clafade .3s ease;
 -moz-animation:clafade .3s ease;
 animation:clafade .3s ease;
 padding:5px;
 background:#fff;
 width:240px;
 box-shadow:0 5px 10px rgba(0,0,0,0.2);
 border-radius:4px;
 position:relative;
 font-family:"Microsoft yahei";
 position:absolute;
 z-index:1000
}
.calender-wrap {
 border:1px solid #e2e2e2
}
.calender-wrap:after {
 content:'';
 display:inline-block;
 border-left:7px solid transparent;
 border-right:7px solid transparent;
 border-bottom:7px solid #eee;
 border-top:0;
 border-bottom-color:#d7d7d7;
 position:absolute;
 left:9px;
 top:-7px
}
.calender-wrap:before {
 content:'';
 display:inline-block;
 border-left:6px solid transparent;
 border-right:6px solid transparent;
 border-bottom:6px solid #ffffff;
 border-top:0;
 position:absolute;
 left:10px;
 top:-6px;
 z-index:10
}
.calender-caption {
 height:35px;
 border-bottom:1px solid #ddd;
 z-index:2;
 background:#eee
}
.calender-content {
 position:relative;
 overflow:hidden
}
.calender-content:after {
 content:'';
 display:block;
 clear:both
}
.calender-cell {
 cursor:pointer;
 float:left;
 width:14.28571428%;
 height:35px;
 text-align:center;
 line-height:35px;
 font-size:12px;
 color:#000;
 z-index:1;
 border-bottom:1px solid #eee
}
.calender-cell:hover {
 background:#eee
}
.calender-caption .calender-cell:hover {
 background:none
}
.calender-cell-dark {
 cursor:no-drop;
 color:#b9b9b9
}
.calender-caption .calender-cell {
 height:35px;
 line-height:35px;
 font-size:13px;
 color:#111;
 font-weight:bold
}
.calender-header {
 text-align:center;
 line-height:35px;
 text-align:center;
 color:#888;
 padding-bottom:4px;
 margin-bottom:1px;
 background:#fff;
 position:relative;
 border-bottom:1px solid #e6e6e6;
 font-size:14px
}
#calender-prev,#calender-next {
 text-decoration:none;
 display:block;
 width:14.2857%;
 height:35px;
 background:#fff;
 position:absolute;
 left:0%;
 top:0px;
 font-family:'宋体';
 font-size:14px;
 color:#555
}
#calender-prev,#calender-next {
 color:#999;
 font-size:16px
}
#calender-prev:hover,#calender-next:hover {
 background:#eee;
 border-radius:5px;
 color:#222
}
#calender-next {
 left:auto;
 right:0%
}
#calender-year,#calender-mon {
 cursor:pointer;
 padding:2px 4px;
 border-radius: 3px;
 margin:0 3px;
}
#calender-year:hover,#calender-mon:hover {
 background:#eee
}
.calender-list {
 overflow:hidden
}
.calender-list2,.calender-list3 {
 display:none
}
.calender-year-cell,.calender-mon-cell {
 width:32.41%;
 float:left;
 border-radius:4px;
 text-align:center;
 font-size:12px;
 padding:15px 0;
 border:1px solid #fff
}
.calender-year-cell:hover,.calender-mon-cell:hover {
 background:#eee;
 cursor:pointer
}
.calender-cell.active,.calender-year-cell.active,.calender-mon-cell.active {
 background:#23acf1;
 color:#fff
}
.calender-cell.active:hover,.calender-year-cell.active:hover,.calender-mon-cell.active:hover {
 background:#23acf1;
 color:#fff
}
.calender-button {
 border-top:1px solid #eee;
 width:100%;
 margin-top:-1px;
 padding:7px 0px 2px 0;
 overflow:hidden
}
.calender-button a {
 display:block;
 text-align:center;
 padding:0px 15px;
 height: 25px;
 line-height: 25px;
 float:right;
 background:#23acf1;
 color:#fff;
 margin-right:5px;
 cursor:pointer;
 margin-left:5px;
 font-size:12px;
 text-decoration:none
}
.calender-button a:hover {
 background:#0084c9
}
.calender-wrap.year .calender-list,.calender-wrap.month .calender-list {
 display:none
}
.calender-wrap.year .calender-list2 {
 display:block
}
.calender-wrap.month .calender-list3 {
 display:block
}
@keyframes clafade {
 0% {
 transform:scale(0.95);
 opacity:0
}
100% {
 transform:scale(1);
 opacity:1
}
}@-webkit-keyframes clafade {
 0% {
 -webkit-transform:scale(0.95);
 opacity:0
}
100% {
 -webkit-transform:scale(1);
 opacity:1
}
} .calend {
 display: block;
 width: 180px;
 line-height: 28px;
 background: #222;
 color: #fff;
 padding: 5px 12px;
 margin:20px 20px 20px 0;
 font-size: 14px;
}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
.containter {
 width:320px;
 margin:auto
}
.calender-wrap {
 -webkit-animation:clafade .3s ease;
 -moz-animation:clafade .3s ease;
 animation:clafade .3s ease;
 padding:5px;
 background:#fff;
 width:240px;
 box-shadow:0 5px 10px rgba(0,0,0,0.2);
 border-radius:4px;
 position:relative;
 font-family:"Microsoft yahei";
 position:absolute;
 z-index:1000
}
.calender-wrap {
 border:1px solid #e2e2e2
}
.calender-wrap:after {
 content:'';
 display:inline-block;
 border-left:7px solid transparent;
 border-right:7px solid transparent;
 border-bottom:7px solid #eee;
 border-top:0;
 border-bottom-color:#d7d7d7;
 position:absolute;
 left:9px;
 top:-7px
}
.calender-wrap:before {
 content:'';
 display:inline-block;
 border-left:6px solid transparent;
 border-right:6px solid transparent;
 border-bottom:6px solid #ffffff;
 border-top:0;
 position:absolute;
 left:10px;
 top:-6px;
 z-index:10
}
.calender-caption {
 height:35px;
 border-bottom:1px solid #ddd;
 z-index:2;
 background:#eee
}
.calender-content {
 position:relative;
 overflow:hidden
}
.calender-content:after {
 content:'';
 display:block;
 clear:both
}
.calender-cell {
 cursor:pointer;
 float:left;
 width:14.28571428%;
 height:35px;
 text-align:center;
 line-height:35px;
 font-size:12px;
 color:#000;
 z-index:1;
 border-bottom:1px solid #eee
}
.calender-cell:hover {
 background:#eee
}
.calender-caption .calender-cell:hover {
 background:none
}
.calender-cell-dark {
 cursor:no-drop;
 color:#b9b9b9
}
.calender-caption .calender-cell {
 height:35px;
 line-height:35px;
 font-size:13px;
 color:#111;
 font-weight:bold
}
.calender-header {
 text-align:center;
 line-height:35px;
 text-align:center;
 color:#888;
 padding-bottom:4px;
 margin-bottom:1px;
 background:#fff;
 position:relative;
 border-bottom:1px solid #e6e6e6;
 font-size:14px
}
#calender-prev,#calender-next {
 text-decoration:none;
 display:block;
 width:14.2857%;
 height:35px;
 background:#fff;
 position:absolute;
 left:0%;
 top:0px;
 font-family:'宋体';
 font-size:14px;
 color:#555
}
#calender-prev,#calender-next {
 color:#999;
 font-size:16px
}
#calender-prev:hover,#calender-next:hover {
 background:#eee;
 border-radius:5px;
 color:#222
}
#calender-next {
 left:auto;
 right:0%
}
#calender-year,#calender-mon {
 cursor:pointer;
 padding:2px 4px;
 border-radius: 3px;
 margin:0 3px;
}
#calender-year:hover,#calender-mon:hover {
 background:#eee
}
.calender-list {
 overflow:hidden
}
.calender-list2,.calender-list3 {
 display:none
}
.calender-year-cell,.calender-mon-cell {
 width:32.41%;
 float:left;
 border-radius:4px;
 text-align:center;
 font-size:12px;
 padding:15px 0;
 border:1px solid #fff
}
.calender-year-cell:hover,.calender-mon-cell:hover {
 background:#eee;
 cursor:pointer
}
.calender-cell.active,.calender-year-cell.active,.calender-mon-cell.active {
 background:#23acf1;
 color:#fff
}
.calender-cell.active:hover,.calender-year-cell.active:hover,.calender-mon-cell.active:hover {
 background:#23acf1;
 color:#fff
}
.calender-button {
 border-top:1px solid #eee;
 width:100%;
 margin-top:-1px;
 padding:7px 0px 2px 0;
 overflow:hidden
}
.calender-button a {
 display:block;
 text-align:center;
 padding:0px 15px;
 height: 25px;
 line-height: 25px;
 float:right;
 background:#23acf1;
 color:#fff;
 margin-right:5px;
 cursor:pointer;
 margin-left:5px;
 font-size:12px;
 text-decoration:none
}
.calender-button a:hover {
 background:#0084c9
}
.calender-wrap.year .calender-list,.calender-wrap.month .calender-list {
 display:none
}
.calender-wrap.year .calender-list2 {
 display:block
}
.calender-wrap.month .calender-list3 {
 display:block
}
@keyframes clafade {
 0% {
 transform:scale(0.95);
 opacity:0
}
100% {
 transform:scale(1);
 opacity:1
}
}@-webkit-keyframes clafade {
 0% {
 -webkit-transform:scale(0.95);
 opacity:0
}
100% {
 -webkit-transform:scale(1);
 opacity:1
}
} .calend {
 display: block;
 width: 180px;
 line-height: 28px;
 background: #222;
 color: #fff;
 padding: 5px 12px;
 margin:20px 20px 20px 0;
 font-size: 14px;
}
</style>

</head>

<body>

<div id="calend" class="calend">选择日期</div>
<div id="calend1" class="calend">选择日期</div>


<script>
window.calender = (function(win,doc){
 function C(str){
  this.dom = doc.querySelector(str);
  this.s = {
   date : [ new Date().getFullYear(),new Date().getMonth()+1,new Date().getDate()],
   button : false,
   format : 'yyyy年MM月dd日',
   left : 0,
   top: 0,
   onload : function(){}
  }
 };
 C.prototype = {
  init : function(){
   var t = this;
   if( typeof arguments[0] == 'function'){
    t.cb = arguments[0];
   }else{
    t.newS = arguments[0];
    t.cb = arguments[1] || function(){}
   };
   t.yoff = false;
   t.moff = false;
   t.extend(t.s,t.newS);
   t.nt = new Date();
   t.nt.setFullYear(t.s.date[0]);
    t.nt.setMonth(t.s.date[1]-1);
    var len = this.getDateLength(t.nt.getFullYear(),t.nt.getMonth() )
    t.nt.setDate(t.s.date[2]>len ? len : t.s.date[2]);
    t.day = t.nt.getDate();
   t.dom.onclick = function(ev){
    var e = ev || event;
    t.create();
    t.bind();
    t.s.onload.call(this)
    e.stopPropagation ? e.stopPropagation() : (e.cancelBubble = true)
   }; 
  },
  hide : function(){
   var t = this;
   t.cb.call(t.dom,t.format( t.nt.getFullYear()+'/'+ (t.nt.getMonth()+1)+'/'+ t.day+' '+new Date().getHours()+':'+new Date().getMinutes()+':'+new Date().getSeconds(),t.s.format));
   if( g('.calender-wrap')) doc.body.removeChild( g('.calender-wrap') )
  },
  bind : function(){
   var t = this;
   var Content = g('.calender-content');
   t.createDay();
   var Prev = g('#calender-prev'),
    Next = g('#calender-next'),
    Year = g('#calender-year'),
    Mon = g('#calender-mon');
   if(t.s.button){
    var today = g('.calender-today');
    var enter = g('.calender-ent');
    today.onclick = function(){
     t.nt.setFullYear(new Date().getFullYear());
      t.nt.setMonth(new Date().getMonth());
      t.nt.setDate( new Date().getDate());
      t.s.date[2] = t.day = new Date().getDate()
     t.createYear()
     t.createDay()
     t.createMon()
    };
    enter.onclick = function(){
     t.hide();
    }
   }
   Content.onclick = function(ev){
    var ev = ev || event; 
    var _target = ev.target || ev.srcElement; 
    if(!t.has(_target,'calender-cell-dark') ){
     var chl = this.children;
     for(var i = 0;i<chl.length;i++){
      t.del(chl[i],'active');
     };
     t.add(_target,'active');
     t.nt.setDate(_target.getAttribute('data-n'));
     t.s.date[2] = t.day = _target.getAttribute('data-n')
     if(!t.s.button){
      t.hide();
     }
    }
   }
   Prev.onclick = Next.onclick = function(){
    var y = t.nt.getFullYear(),m = t.nt.getMonth();
    if(t.moff) return
    if(t.yoff){
     t.nt.setFullYear( this.id=="calender-prev" ? y -= 9 : y += 9)
     t.createYear()
    }else{
     this.id=="calender-prev" ? m-- : m++;
     t.nt.setDate(1);
     t.nt.setMonth( m );
     t.createDay()
    }
   }
   Year.onclick = function(){
    t.createYear();
    t.yoff = true;
    t.moff = false;
    t.del(g('.calender-wrap'),'month');
    t.add(g('.calender-wrap'),'year');
   };
   Mon.onclick = function(){
    t.createMon();
    t.moff = true;
    t.yoff = false;
    t.del(g('.calender-wrap'),'year');
    t.add(g('.calender-wrap'),'month');
   };
  },
  getDateLength : function(year,month){
   //获取某一月有多少天, month为实际月份，一月即为1
   return new Date(year,month,0).getDate();
  },
  getFirstDay : function(year,month){
   //获取某一月第一天是周几,month为实际月份，一月即为1,返回0即为周日
   return new Date(year,month-1,0).getDay();
  },
  createMon : function(){
   var t= this,html='';
   var m = t.nt.getMonth()+1;
   m = m == 0 ? 12 : m;
   for(var i = 1;i<=12;i++){
    html+='<div class="calender-mon-cell '+( m == i ? 'active' : '') +' ">'+ (i) +'</div>';
   };
   g('.calender-list3').innerHTML = html;
   var cells = doc.querySelectorAll('.calender-mon-cell');
   for(var i2 = 0;i2<cells.length;i2++){
     cells[i2].onclick = function(){
      t.moff = false
      t.del(g('.calender-wrap'),'month');
      t.nt.setDate(1)
     t.nt.setMonth(+this.innerHTML-1);
     t.createDay();
     }
   }
  },
  createYear : function(){
   var t= this,html='',y = (t.nt.getFullYear());
   var Year = g('#calender-year');
   for(var i = 0;i<9;i++){
    html+='<div class="calender-year-cell '+( (y-(4-i)) == y ? 'active' :'') +' ">'+ (y-(4-i)) +'</div>';
   }
   Year.innerHTML = y
   g('.calender-list2').innerHTML = html;
   var cells = doc.querySelectorAll('.calender-year-cell');
   for(var i2 = 0;i2<cells.length;i2++){
     cells[i2].onclick = function(){
      t.yoff = false;
      t.del(g('.calender-wrap'),'year');
     t.nt.setFullYear(+this.innerHTML);
     t.createDay();
     }
   }
  },
  createDay : function(n){
   var t = this, 
    y = t.nt.getFullYear(),
    m = (t.nt.getMonth())+1;
   g('#calender-year').innerHTML = m===0 ? y-1 : y;
   g('#calender-mon').innerHTML = m === 0 ? 12 : two(m);
   // if(t.nt.getMonth()+1 == t.s.date[1] && t.nt.getFullYear()==t.s.date[0] ){
   //  t.nt.setDate(t.s.date[2]);
   // };
   var firstDay = this.getFirstDay(y,m),
    length = this.getDateLength(y,m),
    lastMonthLength = this.getDateLength(y,m-1),
    i,html = '';
    t.day = t.s.date[2] > length ? length : t.s.date[2];
   //循环输出月前空格
   if(firstDay ===0) firstDay = 7;
   for(i=1;i<firstDay+1;i++){
    html += '<div class="calender-cell calender-cell-dark">' + (lastMonthLength - firstDay + i) + '</div>';
   }
   //循环输出当前月所有天
   for(i=1;i<length+1;i++){
    html += '<div data-n='+i+' class="calender-cell '+ (i == t.day ? 'active' :'') +'">' + i + '</div>';
   }
   //if(8-(length+firstDay)%7 !=8){
   for(i=1;i<= (41-(length+(firstDay==0 ? 7 : firstDay)-1));i++){
    html+= '<div class="calender-cell calender-cell-dark">' + i + '</div>';
   };
   doc.querySelector('.calender-content').innerHTML = html
  },
  create : function(){
   var t= this;
   if( g('.calender-wrap')) doc.body.removeChild( g('.calender-wrap') )
   var private_Day_title=['一','二','三','四','五','六','日'];
   //内容
   var html = '<div class="calender-wrap">';
   html +='<div id="calender-header" class="calender-header none-btn "><a id="calender-prev" href="javascript:;"><</a><a id="calender-next" href="javascript:;">></a> <span id="calender-year">2016</span>年<span id="calender-mon">10</span>月</div>'
   //星期
   html += '<div class="calender-list"><div class="calender-caption">';
   for(i=0;i<7;i++){
    html += '<div class="calender-cell">' + private_Day_title[i] + '</div>';
   };
   html += '</div><div class="calender-content"></div>';
   if(this.s.button){
    html+='<div class="calender-button"><a href="javascript:;" class="calender-ent">确定</a><a href="javascript:;" class="calender-today">今天</a></div>';
   };
   html += '</div><div class="calender-list calender-list2"></div><div class="calender-list calender-list3"></div>'
   doc.body.insertAdjacentHTML("beforeend", html);
   var wrap = g('.calender-wrap');
   function setPosi(){
    var _top = doc.documentElement.scrollTop || doc.body.scrollTop;
    wrap.style.left = t.dom.getBoundingClientRect().left +t.s.left +'px';;
    wrap.style.top = t.dom.getBoundingClientRect().top + _top + t.dom.offsetHeight+t.s.top + 15 +'px';
   };
   setPosi();
   addEvent(window,'resize',function(){setPosi()})
   wrap.onclick = function(ev){
    var e = ev || event;
    e.stopPropagation ? e.stopPropagation() : (e.cancelBubble = true)
   }
  },
  format : function(da,format){
    var _newDate = new Date(da);
    var WeekArr=['星期日','星期一','星期二','星期三','星期四','星期五','星期六']; 
   var o = { 
    'M+' : _newDate.getMonth()+1, //month 
    'd+' : _newDate.getDate(), //day 
    'h+' : _newDate.getHours(), //hour 
    'm+' : _newDate.getMinutes(), //minute 
    's+' : _newDate.getSeconds(), //second 
    'q+' : Math.floor((_newDate.getMonth()+3)/3), //quarter 
    'S': _newDate.getMilliseconds(), //millisecond 
    'E': WeekArr[_newDate.getDay()], 
    'e+' : _newDate.getDay() 
   }; 
   if (/(y+)/.test(format)){
    format = format.replace(RegExp.$1, (_newDate.getFullYear()+"").substr(4 - RegExp.$1.length));
   };
   for(var k in o) { 
    if(new RegExp('('+ k +')').test(format)) { 
     format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ('00'+ o[k]).substr((''+ o[k]).length)); 
    }; 
   }; 
   return format; 
  },
  extend : function(n,n1){
   for(var i in n1){n[i] = n1[i]};
  },
  has : function(o,n){
   return new RegExp('\\b'+n+'\\b').test(o.className); 
  },
  add : function(o,n){
   if(!this.has(o, n)) o.className+=' '+n; 
  },
  del : function(o,n){
   if(this.has(o, n)){ 
    o.className = o.className.replace(new RegExp('(?:^|\\s)'+n+'(?=\\s|$)'), '').replace(/^\s*|\s*$/g, ''); 
   }; 
  }
 };
 function g(str){return doc.querySelector(str)};
 function addEvent(obj,name,fn){obj.addEventListener? obj.addEventListener(name, fn, false):obj.attachEvent('on'+name,fn);};
 function two(num){return num<10 ? ('0'+num) : (''+num)};
 addEvent(doc,'click',function(){
  if( g('.calender-wrap')) doc.body.removeChild( g('.calender-wrap') )
 });
 function c(o){return new C(o)};return c;
})(window,document);

;(function(){
  calender('#calend').init(function(date){
   this.innerHTML = date
 });
 calender('#calend1').init({format : 'yyyy-MM-dd',
    date : [2020,5,12],
  button : true
 },function(date){
  this.innerHTML = date
 });
})();

</script>


</body>
</html>