js实现点击随机点名效果

代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="container">
        <button>点名</button>
    </div>
    <script>    
        function dm(){
              // 随机点名
            let arr = ['于一',
            '宋二',
            '张三',
            '李四',
            '王五',
            '赵六'
            ]


            let index =Math.floor(Math.random()*arr.length)

            alert(arr[index])
        }
        let btn = document.querySelector('button')
        btn.onclick=dm
        


                
    </script>
</body>
</html>

效果图：