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The simplest native calendar in js

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Dec 30, 2017 pm 04:59 PM

javascript Native

What I bring to you this time is the simplest native calendar in js. In a recent project, I suddenly discovered that date objects can be added and subtracted. I used this feature to write a program that can be said to be suitable for anyone who knows JavaScript can be used to write calendars. This article will give you a good introduction.

<!DOCTYPE html> 
<html> 
 <head> 
  <meta charset="UTF-8"> 
  <title></title> 
  <style type="text/css"> 
   *{ 
    margin: 0px; 
    padding: 0px; 
   } 
   #data{ 
    width: 280px; 
    border: 1px solid #000000; 
    margin: 20px auto; 
   } 
   #data > p{ 
    display: flex; 
   } 
   #data > h5{ 
    text-align: center; 
   } 
   #data > p > span{ 
    padding: 0 10px; 
   } 
   #prev,#next{ 
    cursor: pointer; 
   } 
   #nian{ 
    flex: 1; 
    text-align: center; 
   } 
   #title{ 
    overflow: hidden; 
    list-style: none; 
    background: #ccc; 
   } 
   #title > li{ 
    float: left; 
    width: 40px; 
    height: 26px; 
    line-height: 26px; 
    text-align: center; 
   } 
   #date{ 
    overflow: hidden; 
    list-style: none; 
   } 
   #date > li{ 
    float: left; 
    width: 34px; 
    height: 34px; 
    margin: 1px 1px; 
    border: 2px solid rgba(0,0,0,0); 
    line-height: 34px; 
    text-align: center; 
    cursor: pointer; 
   } 
   #date > .hover:hover{ 
    border: 2px solid red; 
   } 
      
   .active{ 
    color: red; 
   } 
  </style> 
 </head> 
 <body> 
     
  <div id="data"> 
   <p> 
    <span id="prev">上一月</span> 
    <span id="nian">2017</span> 
    <span id="next">下一月</span> 
   </p> 
   <h5 id="yue">一月</h5> 
   <ul id="title"> 
    <li>日</li> 
    <li>一</li> 
    <li>二</li> 
    <li>三</li> 
    <li>四</li> 
    <li>五</li> 
    <li>六</li> 
   </ul> 
   <ul id="date"> 
   </ul> 
  </div> 
     
  <script type="text/javascript"> 
   var dat = new Date(); //当前时间 
   var nianD = dat.getFullYear();//当前年份 
   var yueD = dat.getMonth(); //当前月 
   var tianD = dat.getDate(); //当前天 这保存的年月日 是为了 当到达当前日期 有对比 
      
   add(); //进入页面第一次渲染 
      
   function add(){ 
    document.getElementById(&#39;date&#39;).innerHTML = ""; 
       
    var nian = dat.getFullYear();//当前年份 
    var yue = dat.getMonth(); //当前月 
    var tian = dat.getDate(); //当前天 
    var arr=["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"]; 
    document.getElementById(&#39;nian&#39;).innerText = nian; 
    document.getElementById(&#39;yue&#39;).innerText = arr[yue]; 
       
    var setDat = new Date(nian,yue + 1,1 - 1); //把时间设为下个月的1号 然后天数减去1 就可以得到 当前月的最后一天; 
    var setTian = setDat.getDate(); //获取 当前月最后一天 
    var setZhou = new Date(nian,yue,1).getDay(); //获取当前月第一天 是 周几 
       
    for(var i=0;i<setZhou ;i++){//渲染空白 与 星期 对应上 
     var li=document.createElement(&#39;li&#39;); 
     document.getElementById(&#39;date&#39;).appendChild(li); 
    } 
       
    for(var i=1;i<=setTian;i++){//利用获取到的当月最后一天 把 前边的 天数 都循环 出来 
     var li=document.createElement(&#39;li&#39;); 
     li.innerText = i; 
     if(nian == nianD && yue == yueD && i == tianD){ 
      li.className = "active"; 
     }else{ 
      li.className = "hover"; 
     } 
        
     document.getElementById(&#39;date&#39;).appendChild(li); 
    } 
       
   } 
      
   document.getElementById("next").onclick = function(){ 
    dat.setMonth(dat.getMonth() + 1); //当点击下一个月时 对当前月进行加1; 
    add(); //重新执行渲染 获取去 改变后的 年月日 进行渲染; 
   }; 
   document.getElementById("prev").onclick = function(){ 
    dat.setMonth(dat.getMonth() - 1); //与下一月 同理 
    add(); 
   }; 
  </script> 
 </body> 
</html>

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I believe you have mastered the method after reading the above introduction. For more exciting information, please pay attention to other related articles on the php Chinese website!

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