jquery client

<pre name="code" class="javascript">(function() { 
     
    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" 
            }, 
            { 
                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(); 
     
    window.$.client = { os : BrowserDetect.OS, browser : BrowserDetect.browser }; 
     
})(); 

摘自 longnihao的专栏