js简单日历

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Js日历</title>
<style type="text/css">
 .evrday{
        width:14%;     
         float:left;
         color:li
         }
  #calendar{
      background: rgb(231, 228, 228);
      width:400px;
      height: 300px;
      margin:auto;
  }
 button{
     width:25%;
     height:40px;
     float:left;
 }
 div{
     margin-top:10px;
     margin-bottom:5px;
     text-align:center;
 }
#month{
width:50%;
float:left;
}
</style>
</head>
<body onLoad="showday()">
 <div id="calendar">
    <div>
       <button onClick="shang()">上个月</button>
         <div id="month"></div>
       <button onClick="next()" id="nav">下个月</button>
    </div>
    <div>
       <div class="evrday">周日</div>
       <div class="evrday">周一</div>
       <div class="evrday">周二</div>
       <div class="evrday">周三</div>
       <div class="evrday">周四</div>
       <div class="evrday">周五</div>
       <div class="evrday">周六</div>
    </div>
    <div id="day" style="color:black"></div>
 </div>
 <script>
      var today=new Date();//获取当前时间
      var year=today.getFullYear();//获取当前的年份
      var month=today.getMonth()+1;//获取当前月
      var day=today.getDate();//获取当前月天
      var allday=0;
      function showmonth(){
          var year_month=year+"年"+month+"月";
          document.getElementById("month").innerHTML=year_month;//显示当前的年月日
      }
      function count(){
          if(month!=2)
          {
          if(month==4||month==6||month==9||month==11)//判断是否是相同天数的几个月，二月除外
             allday=30;
             else
             allday=31;
          }
          else
          {
              if((year%4==0&&year%100!=0)||(year%400==0))//判断是否是闰年，进行相应的改变
              allday=29;
              else 
              allday=28;}
      }
      //显示相应月份的天数
      function showday(){      
         showmonth()
            count();
          var fistdate=new Date(year,month-1,1);
          var xinqi=fistdate.getDay();
          var daterow=document.getElementById("day");
          for(var i=0;i<xinqi;i++)//循环输出天数
          {
              var dayElement=document.createElement("div");
                dayElement.className="evrday";
             daterow.appendChild(dayElement);
          }
          for(var j=1;j<=allday;j++)
          {    
              var dayElement=document.createElement("div");
               dayElement.innerHTML=j;
                dayElement.className="evrday";
                if(j==day)//当前日，标红
                 dayElement.style.color="red";
                daterow.appendChild(dayElement);
          }
      }
       //点击下个月
        function next(){
           document.getElementById('day').innerHTML ="";
          if(month<12){  
            month=month+1;
            }else{  
                month=1;
                year=year+1; 
             }
                document.getElementById('div').innerHTML =showday();    
        }
        //点击上个月
        function shang(){
           document.getElementById('day').innerHTML ="";
          if(month>1){
            month=month-1;
              }else{
                 month=12;
                 year=year-1; 
             }
                document.getElementById('div').innerHTML =showday();    
        }
      </script>
</body>
</html>
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