javascript countdown prompt box

This article example shares the specific code of javascript to implement the countdown prompt box for your reference. The specific content is as follows

Code:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>Full screen prompt box</title>
 <style>
  #button{
   width: 150px;
   height: 50px;
   background-color: greenyellow;
  }
  .fullScreenDiv{/* full screen div */
   display: none;
   position: absolute;
   left: 0px;
   top: 0px;
   width: 100%;
   height: 100%;
   background-color: rgba(0, 0, 0, 0.4);
  }
  .promptDiv{/* prompt box div */
   display: none;
   position: absolute;
   left: 50%;
   top: 50%;
   transform: translateX(-50%) translateY(-50%);
   width: 30%;
   height: 30%;
   border-radius: 20px;
   background-color:white;
   text-align: center;
  }
  .close{
   height: 34px;
   line-height: 34px;
   margin: 0px;
   text-align: right;
   border-top-left-radius: 20px;
   border-top-right-radius: 20px;
   background-color: cornflowerblue
  }
  .X{
   padding: 2px 6px;
   margin-right: 8px;
   color: white;
   cursor: pointer;
  }
  .countDown{/*Countdown to close the prompt box*/
   color: red;
   font-size: 28px;
  }
 </style>
 <script>
  window.onload = function(){
   document.getElementById("button").addEventListener("click",function(){
    document.getElementsByClassName("fullScreenDiv")[0].style.display="block";
    document.getElementsByClassName("promptDiv")[0].style.display="block";
     for(var i=5;i>=0;i--){
      (function(i){
       setTimeout(function(){
       var j=Math.abs(i-5); //If i is 0, then the timer is 0s, and the output is abs(0-5)=5. If i is 5, then the timer is 5s, and the output is abs(i-5)=0.   
       if(j==0){
   document.getElementsByClassName("fullScreenDiv")[0].style.display="none";
        document.getElementsByClassName("promptDiv")[0].style.display="none";
        }else{
        document.getElementsByClassName("countDown")[0].innerHTML=j;
        }  
        },i*1000);//Each interval is 1s
       })(i); 
      }
    });
     document.getElementsByClassName("X")[0].addEventListener("click",function(){
      document.getElementsByClassName("fullScreenDiv")[0].style.display="none";
      document.getElementsByClassName("promptDiv")[0].style.display="none";
     }); 
  }
 </script>
</head>
<body>
 <div>
  <button id="button">Open full screen prompt box</button>
 </div>
 <div class="fullScreenDiv">
  <div class="promptDiv">
   <h4 class="close"><span class="X">X</span></h4>
    <p>I am a full screen prompt box. I am a full screen prompt box. I am a full screen prompt box.</p>
    <p>Countdown Close</p>
    <span class="countDown">5</span>
  </div>
 </div>
</body>
</html>

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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