js實現隨機點名功能

本文實例為大傢分享瞭js實現隨機點名的具體代碼,供大傢參考,具體內容如下

效果:

PS:在原來的效果中很快的,但是不知怎麼的錄下來就變得這麼慢瞭

代碼如下:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>隨機點名</title>
  <style>
    .box{
      width: 800px;
      margin: 200px auto;
      text-align: center;
    }
    .box h2{
      font-size: 55px;


      font-weight: 800;
    }
    .box input{
      outline: none;
      border: none;
      background: blue;
      color: white;
      width: 100px;
      height: 50px;
      font-size: 15px;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <div class="box">
    <h2 id="res">請點擊下面的按鈕,開始抽獎!</h2>
    <input type="button" value="點擊開始" id="btn">
  </div>
  
  <script>
   var btn=  document.getElementById("btn");
   var res=  document.getElementById("res");
    var student=["張三","李四","王二","麻子","小明","小王","小胡","小虎","狗子","多銀幣","貢子哥","劉青松","瞎子","亞索"]
  
    var flag=true;
    var timer=null;
    //
    btn.onclick=function(){
     
      
      if(flag){
        timer= setInterval(function(){
         var index= getRandom(student.length-1,0) ;

         
         res.innerHTML=student[index];
         
         
        },10);
        
        btn.value="點擊結束";
        flag=false;
      }else{
        clearInterval(timer);
        btn.value="點擊開始";
        flag=true;
      }
      
    }


    function getRandom(max,min){
      
     return Math.round(Math.random()*(max-min)+min);
    }
  </script>
</body>
</html>

以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。

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