点名小功能

2020-01-26 22:55:48 作者：互联网

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <h1>点到的名字：<span></span></h1>
        <button>点名</button>
        
        <script type="text/javascript">
         var arr=["章子怡","王菲","李小璐","孙燕姿"]
         var btn=document.querySelector("button")
         btn.onclick=function(){
             var randomNum=parseInt(Math.random()*arr.length)
             var name=arr[randomNum]
             var span =document.querySelector("span")
             //innerHTML在JS是双向功能：获取对象的内容  或  向对象插入内容,在这里是向span里插入变量name
             span.innerHTML=name
             
         }
            
        </script>
    </body>
</html>

标签：功能,span,name,arr,randomNum,var,点名,btn
来源： https://www.cnblogs.com/a155-/p/12234998.html