js随机点名 js实现随机点名功能

时间:2021-01-28 等待的L先生人气:0

效果：

PS:在原来的效果中很快的，但是不知怎么的录下来就变得这么慢了

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>随机点名</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">请点击下面的按钮，开始抽奖！</h2>
    <input type="button" value="点击开始" id="btn">
  </div>
  
  <script>
   var btn=  document.getElementById("btn");
   var res=  document.getElementById("res");
    var student=["张三","李四","王二","麻子","小明","小王","小胡","小虎","狗子","多银币","贡子哥","刘青松","瞎子","亚索"]
  
    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="点击结束";
        flag=false;
      }else{
        clearInterval(timer);
        btn.value="点击开始";
        flag=true;
      }
      
    }


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

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