javascript navigator.appName和userAgent未提供我想要的内容

嗨，我是一个全新的人，刚刚开始使用javascript并使用基本警报（）； 我想知道我们如何检查正在使用的浏览器？ 所有都是导航器对象似乎没有给出所需的内容。如果我使用appName，它会让我在所有方面都能看到nestcape，我相信大家都知道这一点

有没有办法让我发出警报（）；检查并显示IE、Firefox、Chrome之类的东西

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如果使用userAgent，它会给出太多的信息……

首先，您不应该尝试进行浏览器检测，也就是说，所有浏览器都会选择实现

userAgent

和

appName

要更正此问题，您应该尝试以下代码

   var BrowserDetect = {
    init: function () {
        this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
        this.version = this.searchVersion(navigator.userAgent)
            || this.searchVersion(navigator.appVersion)
            || "an unknown version";
        this.OS = this.searchString(this.dataOS) || "an unknown OS";
    },
    searchString: function (data) {
        for (var i=0;i<data.length;i++) {
            var dataString = data[i].string;
            var dataProp = data[i].prop;
            this.versionSearchString = data[i].versionSearch || data[i].identity;
            if (dataString) {
                if (dataString.indexOf(data[i].subString) != -1)
                    return data[i].identity;
            }
            else if (dataProp)
                return data[i].identity;
        }
    },
    searchVersion: function (dataString) {
        var index = dataString.indexOf(this.versionSearchString);
        if (index == -1) return;
        return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
    },
    dataBrowser: [
        {
            string: navigator.userAgent,
            subString: "Chrome",
            identity: "Chrome"
        },
        {   string: navigator.userAgent,
            subString: "OmniWeb",
            versionSearch: "OmniWeb/",
            identity: "OmniWeb"
        },
        {
            string: navigator.vendor,
            subString: "Apple",
            identity: "Safari",
            versionSearch: "Version"
        },
        {
            prop: window.opera,
            identity: "Opera",
            versionSearch: "Version"
        },
        {
            string: navigator.vendor,
            subString: "iCab",
            identity: "iCab"
        },
        {
            string: navigator.vendor,
            subString: "KDE",
            identity: "Konqueror"
        },
        {
            string: navigator.userAgent,
            subString: "Firefox",
            identity: "Firefox"
        },
        {
            string: navigator.vendor,
            subString: "Camino",
            identity: "Camino"
        },
        {       // for newer Netscapes (6+)
            string: navigator.userAgent,
            subString: "Netscape",
            identity: "Netscape"
        },
        {
            string: navigator.userAgent,
            subString: "MSIE",
            identity: "Explorer",
            versionSearch: "MSIE"
        },
        {
            string: navigator.userAgent,
            subString: "Gecko",
            identity: "Mozilla",
            versionSearch: "rv"
        },
        {       // for older Netscapes (4-)
            string: navigator.userAgent,
            subString: "Mozilla",
            identity: "Netscape",
            versionSearch: "Mozilla"
        }
    ],
    dataOS : [
        {
            string: navigator.platform,
            subString: "Win",
            identity: "Windows"
        },
        {
            string: navigator.platform,
            subString: "Mac",
            identity: "Mac"
        },
        {
               string: navigator.userAgent,
               subString: "iPhone",
               identity: "iPhone/iPod"
        },
        {
            string: navigator.platform,
            subString: "Linux",
            identity: "Linux"
        }
    ]

};
BrowserDetect.init();

试试这个：

if( navigator.userAgent.toLowerCase().indexOf('chrome') > -1){
   // Google chrome
}
else if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
   // Firefox.
}
else if(navigator.userAgent.toLowerCase().indexOf('msie') > -1){
   // MSIE
}
else if(navigator.userAgent.toLowerCase().indexOf('safari') > -1){
   // Safari
}

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哇哦，我只是喜欢…开始使用javascript…喜欢…完全只是基础知识…这个…>。欢迎来到我们的世界。这是因为您试图检测JavaScript的不同浏览器实现之间的不一致性。>。这是因为nescape创建了JavaScript还是什么？>。

if( navigator.userAgent.toLowerCase().indexOf('chrome') > -1){
   // Google chrome
}
else if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
   // Firefox.
}
else if(navigator.userAgent.toLowerCase().indexOf('msie') > -1){
   // MSIE
}
else if(navigator.userAgent.toLowerCase().indexOf('safari') > -1){
   // Safari
}