为什么没反应

来源：5-4 编程练习

Ting111

2019-06-24 20:26:34

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>userAgent</title>
    </head>
    <body>
       <input type="button" value="点击获取浏览器信息" id="brow">
       <div></div>
       <script type="text/javascript">
           var a=document.getElementById("bro");
           var di=document.getElementsByTagName("div")[0];
           a.onclick=function(){
               var b=navigator.userAgent;
               if(b.indexOf("msie")>-1){
                   di.innerHTML="浏览器是ie";
               }else if(b.indexOf("chrome")>-1){
                    di.innerHTML="浏览器是chrome";
               }
           } 
       </script>
    </body>
</html>

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