麻烦老板帮忙看看哪里出错了，谢谢

来源：5-4 编程练习

胜己

2020-02-18 23:00:40

<!DOCTYPE html>
<html>
    <head lang="en">
        <meta charset="UTF-8">
        <title>userAgent</title>
    </head>
    <body>
       <input type="button" value="点击获取浏览器信息" id="browser">
       <script type="text/javascript">
           //补充代码
           var btn = document.getElementById("browser");
           function getBrowserInfo() {
               var info = navigator.userAgent.toLowerCase();
               var result = "未知";
               if(info.indexOf("msie")>-1){
                   result = "IE浏览器"
               }else if(info.indexOf("firefox")>-1){
                   result = "火狐浏览器"
               }else if(info.indexOf("chrome")>-1){
                   result = "谷歌浏览器"
               }else {
                   return result;
               }
           }
           btn.onclick = function() {
               getBrowserInfo()
               alert("您使用的浏览器是" + result )
           }
       </script>
    </body>
</html>

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