代码：
javascript
<!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：
