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来源：5-4 编程练习

慕村1994845

2020-07-19 17:03:15

<!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="browser">
       <script type="text/javascript">
           //补充代码
           var browser=document.getElementById("browser");
           browser.onclick=function getBrowser(){
               var explorer=navigator.userAgent.toLowerCase(),details;
               if(explorer.indexOf("msie")>-1){
                   details="IE";
               }else if(explorer.indexOf("firefox")>-1){
                   details="FireFox";
               }else if(explorer.indexOf("chrome")>-1){
                   details="Chrome";
               }else if(explorer.indexOf("safari")>-1 && explorer.indexOf("chrome")==-1){
                   details="Safari";
               }
               browser.value="您使用的浏览器是"+details+"浏览器";
           }
       </script>
    </body>
</html>

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