javascript - javascript navigator.appName 和 userAgent 没有给出我想要的

Question

我是全新的，刚开始javascript玩基本的alert()

我想知道我们如何能够检查browser正在使用的内容？所有都是 navigator 对象似乎并没有给出想要的东西。如果我使用appName它，我会全力以赴Netscape，我相信所有人都知道这一点。

有没有办法让我alert();检查和显示只是IE, Firefox, Chrome, 类似的东西？

如果使用userAgent，它会提供太多信息...

Answer 1

首先，您不应该尝试进行浏览器检测，也就是说，所有浏览器都选择实现他们想要的 theuserAgent和 the 。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();

顺便说一下，这段代码取自quirksmode。

要使用此代码，您只需执行以下操作

var version = BrowserDetect.version;
var OS = BBrowserDetect.OS;
var browser = BBrowserDetect.browser;

Answer 2

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
}