<div class="container">
 <input type="text" value="" id="cal-input"/>
 <div class="cal-box">
 <table>
  <thead>
  <tr>
   <td class="sun">日</td>
   <td>一</td>
   <td>二</td>
   <td>三</td>
   <td>四</td>
   <td>五</td>
   <td class="sta">六</td>
  </tr>
  </thead>
  <tbody>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  </tbody>
 </table>
 </div>
</div>

thead td,tbody td{
  width: 20px;
  height: 20px;<br><span class="styles-clipboard-only"> 　　　　　　 <span class="webkit-css-property">text-align: <span class="expand-element"><span class="value">center;</span></span></span></span>
 }
 thead td.sun,thead td.sta{
  color: #eec877;
 }
 tbody td{
  border: 1px solid #eee;
 }

$(function(){
 var $td = $('tbody').find('td');
 
 var date = new Date(),
  year = date.getFullYear(),
  month = date.getMonth() + 1,
  day = date.getDate(),days;
 
 
 function initCal(yy,mm,dd){
  if(mm ==2 && yy%4 == 0 && yy0 !==0 ){
  days = 28;
  }else if(mm == 1 || mm == 3 || mm == 5 || mm == 7 || mm == 8 || mm == 10 || mm == 12){
  days = 31;
  }else if(mm==4 || mm==6 || mm==9 || mm==11 ){
  days = 30;
  }else{
  days = 29;
  }
 
  var m = mm < 3 ? (mm == 1 ? 13 : 14): mm;
  yy = m > 12 ? yy - 1 : yy;
  var c = Number(yy.toString().substring(0,2)),
   y = Number(yy.toString().substring(2,4)),
   d = 1;
  //蔡勒公式
  var week = y + parseInt(y/4) + parseInt(c/4) - 2*c + parseInt(26*(m+1)/10) + d - 1;
 
  week = week < 0 ? (week%7+7)%7 : week%7;
 
  for(var i=0 ;i<42;i++){
  $td.eq(i).text('');　　　　//清空原来的text文本
  }
 
  for(var i = 0;i < days; i++){
  $td.eq( week % 7 +i).text(i+1);　　　　
  }
 }
 
 initCal(year,month,day);
 })

<div class="container">
 <input type="text" value="" id="cal-input"/>
 <div class="cal-box">
 <div class="cal-control-box">
  <div class="wif iw-bofangqixiayiqu left"></div>
  <div class="wif iw-iconfont-bofang left"></div>
  <input type="" value=""/>
  <span>年</span>
  <input type="" value=""/>
  <div class="wif iw-iconfont-bofang right"></div>
  <div class="wif iw-bofangqixiayiqu right"></div>
 </div>
 <table>
  <thead>
  <tr>
   <td class="sun">日</td>
   <td>一</td>
   <td>二</td>
   <td>三</td>
   <td>四</td>
   <td>五</td>
   <td class="sta">六</td>
  </tr>
  </thead>
  <tbody>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  <tr>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
   <td></td>
  </tr>
  </tbody>
 </table>
 </div>
</div>

//更改月份按钮
 $(document).on("click",".iw-iconfont-bofang",function(){
  if($(this).hasClass("left")){
  //判断加还是减
  if(month == 1 ){
   month = 12;
   year--;
  }else{
   month--;
  }
  }else{
  if(month == 12){
   month = 1;
   year ++;
  }else{
   month ++;
  }
  }
  initCal(year,month,day);
 })
 
 //更改年份
 $(document).on("click",".iw-bofangqixiayiqu",function(){
  if($(this).hasClass("left")){
  year--;
  }else{
  year++;
  }
  initCal(year,month,day);
 })
 //年份输入
 $(document).on("change","input.cal-year",function(){
  year = $(this).val();
  initCal(year,month,day);
 })
 
 //月份输入
 $(document).on("change","input.cal-month",function(){
  month = $(this).val();
  initCal(year,month,day);
 })