原生JS实现相邻月份日历

<!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>原生JS写的日历月历 - demo by js.alixixi.com</title>
<style type="text/css">
<!--
body {font-size: 14px;line-height: 20px;margin: 0px;padding: 0px;text-align:center;font-family: Arial;}
#overlay{position:absolute;z-index:999;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.3;filter:alpha(opacity=30);display:none;}
#win{position:absolute;z-index:999;top:50%;left:50%;width:400px;height:200px;background:rgba(00, 00, 00, 0.5);margin:-100px 0 0 -200px;display:none;}
#win #otitle{color:#fff;height:33px;padding-left:10px;text-align:left;background:rgba(00, 00, 00, 0.7);}
#win #otitle #otitlestr {float:left;width:200px;height:30px;line-height:30px;}
#win #otitle #close {font-size:24px;width:33px;height:33px;line-height:33px;text-align:center;font-weight:bold;float:right;cursor:pointer;}
#win #showstr {color:#fff;margin:10px;text-align:left;}
.clear{clear: both;}
em{font-style: normal;}
ul,li{list-style-type: none;margin:0px;padding:0px;}
#newDate{width:1230px;height:auto;margin:35px auto 0 auto;}
#newDate #nowDate{width:600px;height:600px;float:left;cursor:pointer;}
#newDate #nextDate{width:600px;height:600px;float:right;cursor:pointer;}
#newDate .Header{width:594px;height:50px;background:#e6dcda;border-bottom-width: 1px;border-bottom-style: solid;border-bottom-color: #FFF;position:relative;-moz-user-select:none;-webkit-user-select:none;user-select:none; }
#newDate .c{font-size:24px;font-weight:bold;height:50px;line-height:50px;text-align:center;}
#newDate .l{font-size:24px;font-weight:bold;height:50px;line-height:50px;position:absolute; top:0px; left:14px;}
#newDate .r{font-size:24px;font-weight:bold;height:50px;line-height:50px;position:absolute; top:0px; right:14px;}
#newDate .Weeks{width:595px;height:30px;}
#newDate span{font-weight:bold;width:84px;height:30px;line-height:30px;text-align:center;background:#e6dcda;margin-right:1px;float:left;}
#newDate ul li{color:#999;font-size:24px;width:84px;height:70px;line-height:70px;text-align:center;margin-top:1px;margin-right:1px;background:#f5f5f5;float:left;}
-->
</style>
<!--[IF lt IE 9]>
<style>
#win,#win #otitle{filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#7f000000,endColorstr=#7f000000);}
</style>
<![endif]-->
<script type="text/javascript">
window.onload = function(){
  function $(id){return typeof id === "string" ? document.getElementById(id) : id;}
 function lightBoxShow(title,str)
 {
 var oWin = $("win");
   var oLay = $("overlay");
 $("otitlestr").innerHTML = title;
 $("showstr").innerHTML = str;
 oLay.style.display = "block";
 oWin.style.display = "block";
 $("close").onclick = function ()
   {
   oLay.style.display = "none";
   oWin.style.display = "none" 
   }
 }
 
  var newDate = document.getElementById("newDate");
 var nowDate = document.getElementById("nowDate");
 var nextDate = document.getElementById("nextDate");
 var nDate = new Date();
 
 if(nDate.getMonth()+1==12){
   viewDate(nowDate,nDate.getFullYear(),nDate.getMonth()+1,true);
 viewDate(nextDate,nDate.getFullYear()+1,1);
 }else{
   viewDate(nowDate,nDate.getFullYear(),nDate.getMonth()+1,true);
 viewDate(nextDate,nDate.getFullYear(),nDate.getMonth()+2);
 }
 showBtn();
 
 function viewDate(obj,year,month,bBtn){
   var nDate = new Date();
 var dayNum = 0;
    
    if(!obj.bBtn){
      obj.Header = document.createElement("div");
      obj.Header.className = "Header";
      obj.appendChild(obj.Header);
      
      var Weeks = document.createElement("div");
      Weeks.className = "Weeks";
      obj.appendChild(Weeks);
      
      var weeksArr = ['SUN','MON','TUE','WEB','THU','FRI','SAT'];
      for(var i=0;i<7;i++){
        var nSpan = document.createElement("span");
        nSpan.innerHTML = weeksArr[i];
        if(i==0 || i==6){
          nSpan.style.color = "red";  
        }
        Weeks.appendChild(nSpan);
      }
      
      var nUl = document.createElement("ul");
      for(var i=0;i<42;i++){
        var nLi = document.createElement("li");
        nUl.appendChild(nLi);
      }
      obj.appendChild(nUl);
      
      obj.bBtn = true;
    }
    obj.Header.innerHTML = ( bBtn ? '<div class="l">< <em>'+(month-1)+'</em></div>' : '<div class="r"><em>'+(month+1)+'</em> ></div>')+'<div class="c"><em>'+year+'</em>-<em>'+month+'</em></div>'; 
    var aLi = obj.getElementsByTagName("li");
    for(var i=0;i<aLi.length;i++){
      aLi[i].innerHTML = "";
      aLi[i].style.background = "#f5f5f5";
      aLi[i].style.color = "#999";
    }
    
    if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12){
  dayNum = 31;
 }
 else if(month==4 || month==6 || month==9 || month==11){
  dayNum = 30;
 }
 else if(month==2 && isLeapYear(year)){
  dayNum = 29;
 }
 else{
  dayNum = 28;
 }
 
 nDate.setFullYear(year);
 nDate.setMonth(month-1);
 nDate.setDate(1);
 
 function Today(){
   var tDate = new Date();
  var tEm = aLi[i].parentNode.parentNode.getElementsByTagName("em");
   var tMonth = parseInt(tEm[2].innerHTML);
   var tYear = parseInt(tEm[1].innerHTML);
  if(aLi[i].innerHTML == tDate.getDate() && tYear == tDate.getFullYear() && tMonth == tDate.getMonth()+1){
     aLi[i].style.color = "#000";
     aLi[i].style.background = "#e6dcda";
   }  
 }
 
 switch(nDate.getDay()){
  case 0:
  for(var i=0;i<dayNum;i++){
   aLi[i].innerHTML = i+1;
   Today();
  }
  break;
  case 1:
  for(var i=0;i<dayNum;i++){
   aLi[i+1].innerHTML = i+1;
   Today(); 
  }
  break;
  case 2:
  for(var i=0;i<dayNum;i++){
   aLi[i+2].innerHTML = i+1;
   Today();
     } 
  break;
  case 3:
  for(var i=0;i<dayNum;i++){
   aLi[i+3].innerHTML = i+1;
   Today();
  }
  break;
  case 4:
  for(var i=0;i<dayNum;i++){
   aLi[i+4].innerHTML = i+1;
   Today();
  }
  break;
  case 5:
  for(var i=0;i<dayNum;i++){
   aLi[i+5].innerHTML = i+1;
   Today(); 
  }
  break;
  case 6:
  for(var i=0;i<dayNum;i++){
   aLi[i+6].innerHTML = i+1;
   Today(); 
  }
  break;
  
 }
 
 if(month==1 && bBtn){
  obj.Header.getElementsByTagName('em')[0].innerHTML = 12;
 }
 else if(month==12 && !bBtn){
  obj.Header.getElementsByTagName('em')[0].innerHTML = 1;
 }
 
 }
 
 function isLeapYear(year){
 if(year%4==0 && year%100!=0){
  return true;
 }
 else{
  if(year%400==0){
  return true;
  }
  else{
  return false;
  }
 }
 }
 
 
 function showBtn(){
 var nowEm = nowDate.getElementsByTagName("em");
 var nextEm = nextDate.getElementsByTagName("em");
 var leftMonth = parseInt(nowEm[0].innerHTML);
 var leftYear = parseInt(nowEm[1].innerHTML);
 var rightMonth = parseInt(nextEm[0].innerHTML);
 var rightYear = parseInt(nextEm[1].innerHTML);
 
 
 nowEm[0].parentNode.onclick = function(){
 
  if(leftMonth == 12){
  viewDate(nowDate,leftYear-1,leftMonth,true);
  viewDate(nextDate,leftYear,1);
  }
  else{
  viewDate(nowDate,leftYear,leftMonth,true);
  viewDate(nextDate,leftYear,leftMonth+1);
  }
  
  showBtn();
   
 };
 
 nextEm[0].parentNode.onclick = function(){
  
  if(rightMonth == 1){
  viewDate(nowDate,rightYear,12,true);
  viewDate(nextDate,rightYear+1,rightMonth);
  }
  else{
  viewDate(nowDate,rightYear,rightMonth-1,true);
  viewDate(nextDate,rightYear,rightMonth);
  }
  
  showBtn();
   
 };
 
 }
 function nowDay(){
   var tLi = newDate.getElementsByTagName("li");
   var tDate = new Date();
   
   for(var i=0;i<tLi.length;i++){
     tLi[i].onmouseover = function(){
     if(this.innerHTML != ""){
       this.style.color = "#000";
       this.style.background = "#e6dcda";
    }
   }
   tLi[i].onmouseout = function(){
     if(this.innerHTML != ""){
       this.style.color = "#999";
       this.style.background = "#f5f5f5";
    }
   }
   tLi[i].onclick = function(){
     var tEm = this.parentNode.parentNode.getElementsByTagName("em");
     var tMonth = parseInt(tEm[2].innerHTML);
     var tYear = parseInt(tEm[1].innerHTML);
     if(this.innerHTML!=""){
       lightBoxShow(tYear+"-"+tMonth+"-"+this.innerHTML+" Message","None");
       //alert(tYear+"-"+tMonth+"-"+this.innerHTML);
     }
   }
   }
   
   for(var j=tLi.length/2;j<tLi.length;j++){
     if(tLi[j].innerHTML == tDate.getDate()){
     tLi[j].style.color = "#000";
     tLi[j].style.background = "#e6dcda";
   }  
   }
 }
 nowDay();
}
</script>
</head>
<body>
<div id="newDate">
  <div id="nextDate"></div>
  <div id="nowDate"></div>
</div>
<div id="overlay"></div>
<div id="win">
  <div id="otitle">
    <div id="close">×</div>
   <div id="otitlestr"></div>
  </div>
  <div id="showstr"></div>
</div>
</body>
</html>

原生JS实现相邻月份日历

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