原生JavaScript实现日历功能代码实例(无引用Jq)

 
 
 
 
 


 

  

   

    
   
   

   

    
   
  
  

   

    
日
    
一
    
二
    
三
    
四
    
五
    
六
   
   

   
  
 
 

*{
 margin: 0;
 padding: 0;
}
/*清除浮动代码*/
.clearfloat:after{display:block;clear:both;content:"";visibility:hidden;height:0}
.clearfloat{zoom:1}
#calendarElement{
 margin: 100px auto;
 width: 80%;
 box-shadow: 0 0 10px #999999;
}
#calendarElement>.header{
 height: 80px;
 background-color: coral;
 display: flex;
 border-bottom: 1px solid #fff;
}
#calendarElement>.header .prev{
 width: 20%;
 position: relative;
}
#calendarElement>.header .prev i{
 width: 20px;
 height: 20px;
 display: block;
 position: absolute;
 left: 50%;
 top: 50%;
 margin-top: -10px;
 margin-left: -10px;
 transform: rotate(45deg);
 border: 2px solid #fff;
 border-right: none;
 border-top: none;
}
#calendarElement>.header .next{
 position: relative;
}
#calendarElement>.header .next i{
 width: 20px;
 height: 20px;
 display: block;
 position: absolute;
 left: 50%;
 top: 50%;
 margin-top: -10px;
 margin-left: -10px;
 transform: rotate(45deg);
 border: 2px solid #fff;
 border-left: none;
 border-bottom: none;
}
#calendarElement>.header .date{
 width: 60%;
 font-size: 22px;
 line-height: 80px;
 color: #fff;
 text-align: center;
}
#calendarElement>.header .next{
 width: 20%;
}
#calendarElement>.content >.week{
 box-sizing: border-box;
 width: 100%;
 height: 40px;
 color: #fff;
 display: flex;
 padding: 0 1%;
}
#calendarElement>.content >.week >div{
 width: 14%;
 text-align: center;
 line-height: 40px;
}
#calendarElement>.content >.weekMany{
 padding-top: 5px;
 padding-bottom: 15px;
}
#calendarElement>.content >.weekMany>div{
 float: left;
 width: 14.28%;
 height: 40px;
 text-align: center;
 line-height: 40px;
 font-size: 14px;
}
#calendarElement>.content >.weekMany>.otherMonth{
 color: #999999
}

var currentTime="";   //当前时间年月日
var dom=document.querySelector("#calendarElement");       //承载元素
var color="";
getCurrentTime();
randomColor();
showDay();
function getCurrentTime(){ //获取当前时间
 var time=new Date();
 var year=time.getFullYear();
 var mOnth=time.getMonth()+1;
 var day=time.getDate();
 if(month<10){
  mOnth="0"+month
 }
 var data=year+ "-" +month;
 currentTime=year+ "-" +month+"-"+day;
 document.querySelector(".date").innerHTML=data;
};
dom.addEventListener("click",function(e){
 if(e.target.className=="previ" || e.target.className=="prev"){
  getMonths("prev")
 }else if(e.target.className=="nexti" || e.target.className=="next"){
  getMonths("next")
 }
})
function showDay(){
 var html="";
 var MOnthOne=currentTime;
 var yearMOnth=currentTime.split('-').slice(0,2);
 yearMOnth=yearMonth.join('-');
 document.querySelector(".date").innerHTML=yearMonth;
 MOnthOne=MonthOne.split('');
 MonthOne.splice(8,2,"01")
 MOnthOne=MonthOne.join('');
 var mOnthLen=getMonthLength(MonthOne);  //每月有多少天
 var weekMany=new Date(MonthOne).getDay();  //每月一号是星期几
 html+=getPrevMonthHtml(weekMany);
 html+=getNowMonthHtml(monthLen);
 html+=getNextMonthHtml(weekMany,monthLen);
 document.querySelector(".weekMany").innerHTML=html;
}
function getPrevMonthHtml(weekMany){
 var html="";
 var lastMOnth=currentTime.substring(0, 7);  //得出年月
 lastMOnth=lastMonth.split('-')
 if(lastMonth[1]-1==0){
  lastMonth[1]=12;
  lastMonth[0]=lastMonth[0]-1;
 }else if(lastMonth[1]-1<10){
  lastMonth[1]="0"+(lastMonth[1]-1);
 }
 lastMOnth=lastMonth.join('-');
 var mOnthLen=getMonthLength(lastMonth);
 var start=monthLen-weekMany;
 for(var i=start+1;i<=monthLen;i++){
  html+='
'+i+'
';
 }
 return html;
}
function getNowMonthHtml(monthLen){
 var html="";
 var MOnthOne=currentTime.substring(0, 7);  //得出年月
 var today=currentTime.split('-')[2];
 for(var i=1;i<=monthLen;i++){
  if(i<10){
   var q="0"+i;
  }else{
   var q=i;
  }
  if(i==today){
   html+='
'+i+'
';
  }else{
   html+='
'+i+'
';
  }
 }
 return html;
}
function getNextMonthHtml(weekMany,monthLen){
 var html="";
 var daynum=weekMany+monthLen;
 if(daynum%7==0){
  return html;
 }else{
  var num=daynum%7;
  var lessNum=7-num;  //差几天
  var lowerMOnth=currentTime.substring(0, 7);  //得出年月
  lowerMOnth=lowerMonth.split('-')
  if(lowerMonth[1]+1==13){
   lowerMonth[1]="0"+1;
   lowerMonth[0]=+lowerMonth[0]+1;
  }else{
   lowerMonth[1]=+lowerMonth[1]+1;
   if(lowerMonth[1]<10){
    lowerMonth[1]="0"+lowerMonth[1];
   }
  }
  lowerMOnth=lowerMonth.join('-');
  for(var i=1;i<=lessNum;i++){
   if(i<10){
    var q="0"+i
   }
   html+='
'+i+'
';
  }
 }
 return html;
}
function getMonths(around){
 if(around=="prev"){
  currentTime=currentTime.split('-');
  currentTime[1]=currentTime[1]-1;
  if(currentTime[1]==0){
   currentTime[1]="12"
   currentTime[0]=+currentTime[0]-1
  }
  if(currentTime[1]<10){
   currentTime[1]="0"+currentTime[1]
  }
  currentTime=currentTime.join('-');
  showDay();
 }else if(around=="next"){
  currentTime=currentTime.split('-');
  currentTime[1]=+currentTime[1]+1;
  if(currentTime[1]==13){
   currentTime[1]="1"
   currentTime[0]=+currentTime[0]+1
  }
  if(currentTime[1]<10){
   currentTime[1]="0"+currentTime[1]
  }
  currentTime=currentTime.join('-');
  showDay();
 }
}
 
function getMonthLength(date) {  // 获取每月有多少天
 let d = new Date(date)
 // 将日期设置为下月一号
 d.setMonth(d.getMonth()+1)
 d.setDate('1')
 // 获取本月最后一天
 d.setDate(d.getDate()-1)
 return d.getDate()
}
function randomColor(){   //随机颜色
 color = '#'+Math.floor(Math.random()*16777215).toString(16); 
 if(color.length==6){
  color+="0"
 }
 document.querySelector(".header").style.backgroundColor=color;
 document.querySelector(".week").style.backgroundColor=color;
};