用js如何写一个随机点名器？

发布时间：2022-02-16 15:45 所属栏目：13 来源：互联网

导读：老师在课堂上，经常会随机点名学生回答问题，我们现在学习了JavaScript，那么怎样用JS来实现一个随机点名器呢？下面小编就给大家分享一个实现简单的随机点名器的代码，感兴趣的朋友就继续往下看吧。代码： !DOCTYPE html html head meta charset=UTF-8 titl

老师在课堂上，经常会随机点名学生回答问题，我们现在学习了JavaScript，那么怎样用JS来实现一个随机点名器呢？下面小编就给大家分享一个实现简单的随机点名器的代码，感兴趣的朋友就继续往下看吧。

        代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
  .box{
  width:300px;
  height:200px;
  border:1px solid #ccc;
  /*position: absolute;
  left:0;
  right:0;
  top:0;
  bottom:0;
  margin: auto;*/
  margin: 100px auto;
  text-align: center;
  }
  h1{
  width:150px;
  height:60px;
  line-height: 60px;
  text-align: center;
  font-size: 30px;
  background-color: red;
  margin: 10px auto;
  }
  button{
  width:100px;
  height:40px;
  background-color: dodgerblue;
  border:0;
  font-size: 24px;
  color:#fff;
  }


</style>
</head>
<body>
<div class="box">
  <h1></h1>
  <button>开始</button>
  <button>停止</button>
</div>
<script>
  var h1=document.getElementsByTagName('h1')[0];
  var btn=document.getElementsByTagName("button");
  var arr=["苏晨旭","张志阳","小明","社会坤哥","药","敬珍","锦涛","网管","社会辰哥",
"渣男","雪","宝贝曼","大个","睡神","龙爷","英儿","东北娃","珂珂","黄花大闺女","狗蛋",
"狗子","天娇","志强","晋玮","海涛","迈姐","新凤","环姐","二狗"];

  var ind=ranFun(0,arr.length-1)

  h1.innerHTML=arr[ind];
  var timer;
  btn[0].onclick=function(){
  clearInterval(timer)
  timer=setInterval(function(){
   h1.innerHTML=arr[ranFun(0,arr.length-1)]
  },100)
  }

  btn[1].onclick=function(){
  clearInterval(timer)
  }

  function ranFun(a,b){
  return Math.floor(Math.random()*(b-a+1)+a)
  }
</script>
</body>
</html>

（编辑：ASP站长网）