navigator对象及属性(userAgent)(扩展)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>navigator对象及属性(userAgent)(扩展)</title>
    <!-- 
        Navigator 对象包含有关浏览器的信息
        navigator.userAgent;用户使用的系统信息及浏览器信息
     -->
</head>
<body>
    <script>
        var browse,nav=navigator.userAgent;
        console.log(nav);
        function na(){
        var browse,explorer=navigator.userAgent.toLowerCase();//获取浏览器信息并将其变成小写
            if (explorer.indexOf("trident")>-1){ //indexOf如果找到ie会返回ie的索引值,如果找不到会返回-1,
                browse="IE";
            }else if(explorer.indexOf("chrome")>-1){
                browse="chrome";
            }else if(explorer.indexOf("opera")>-1){
                browse="opera";
            }else if(explorer.indexOf("safari")>-1){
                browse="safari";
            }
            return browse;
        }
        var bro=na();
        alert("当前为:"+bro+"浏览器");
    </script>
</body>
</html>

posted on 2019-12-21 17:02  loongw  阅读(941)  评论(0编辑  收藏  举报

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