1 var client = function () {  2     //呈现引擎  3     var engine = {  4         ie: 0,  5         gecko: 0,  6         webkit: 0,  7         khtml: 0,  8         opera: 0,  9         //完整版本号 10         ver: null 11     } 12     //浏览器 13     var browser = { 14         //主要浏览器 15         ie: 0, 16         firefox: 0, 17         safari: 0, 18         konq: 0, 19         opera: 0, 20         chrome: 0, 21         //具体版本号 22         ver: null 23     }; 24     //平台、设备和操作系统 25     var system = { 26         win: false, 27         mac: false, 28         x11: false, 29         //移动设备 30         iphone: false, 31         ipod: false, 32         ipad: false, 33         ios: false, 34         android: false, 35         nokiaN: false, 36         winMobile: false, 37  38         //游戏系统 39         wii: false, 40         ps: false 41     }; 42     //检测呈现引擎和浏览器 43     var ua = navigator.userAgent; 44     if (window.opera) { 45         engine.ver = browser.ver = window.opera.version(); 46         engin.opera = browser.opera = parseFloat(engine.ver); 47     } else if (/AppleWebKit\/(\S+)/.test(ua)) { 48         engine.ver = RegExp["$1"]; 49         engine.webkit = parseFloat(engine.ver); 50  51         //确定是chrome还是safari 52         if (/Chrome\/(\S+)/.test(ua)) { 53             browser.ver = RegExp["$1"]; 54             browser.chrome = parseFloat(browser.ver); 55         } else if (/Version\/(\S+)/.test(ua)) { 56             browser.ver == RegExp["$1"]; 57             browser.safari = parseFloat(browser.ver); 58         } else { 59             var safariVersion = 1; 60             if (engine.webkit < 100) { 61                 safariVersion = 1; 62             } else if (engine.webkit < 312) { 63                 safariVersion = 1.2; 64             } else if (engine.webkit < 412) { 65                 safariVersion = 1.3; 66             } else { 67                 safariVersion = 2; 68             } 69  70             browser.safari = browser.ver = safariVersion; 71         } 72     } else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) { 73         engine.ver = browser.ver = RegExp["$1"]; 74         engine.khtml = browser.konq = parseFloat(engine.ver); 75     } else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)) { 76         engine.ver = RegExp["$1"]; 77         engine.gecko = parseFloat(engine.ver); 78  79         //确定不是Firefox 80         if (/Firefox\/(\S+)/.test(ua)) { 81             browser.ver == RegExp["$1"]; 82             browser.firefox = parseFloat(browser.ver); 83         } 84     } else if (/MSIE ([^;]+)/.test(ua)) { 85         engine.ver = browser.ver = RegExp["$1"]; 86         engine.ie = browser.ie = parseFloat(engine.ver); 87     } 88  89     //检测浏览器 90     browser.ie = engine.ie; 91     browser.opera = engine.opera; 92  93     //检测平台 94     var p = navigator.platform; 95     system.win = p.indexOf("Win") == 0; 96     system.mac = p.indexOf("Mac") == 0; 97     system.x11 = (p == "X11") || (p.indexOf("Linux") == 0); 98  99     //检测window操作系统100     if (system.win) {101         if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) {102             if (RegExp["$1"] == "NT") {103                 switch (RegExp["$2"]) {104                     case "5.0":105                         system.win = "2000";106                         break;107                     case "5.1":108                         system.win = "XP";109                         break;110                     case "6.0":111                         system.win = "Vista";112                         break;113                     case "6.1":114                         system.win = "7";115                         break;116                     default:117                         system.win = "NT";118 119                 }120             } else if (RegExp["$1"] == "9x") {121                 system.win = "ME";122             } else {123                 system.win = RegExp["$1"];124             }125         }126     }127 128     //移动设备129     system.iphone = ua.indexOf("iPhone") > -1;130     system.ipod = ua.indexOf("iPod") > -1;131     system.ipad = ua.indexOf("iPad") > -1;132     system.nokiaN = ua.indexOf("NokiaN") > -1;133 134     //window mobile135     if (system.win == "CE") {136         system.winMobile = system.win;137     } else if (system.win == "Ph") {138         if (/windows Phone OS (\d+.\d+)/.test(ua)) {139             system.win = "Phone";140             system.winMobile = parseFloat(RegExp["$1"]);141         }142 143     }144 145     //检测ios版本146 147     if (system.mac && ua.indexOf("Mobile") > -1) {148         if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)) {149             system.ios = parseFloat(RegExp.$1.replace("_", "."));150         } else {151             system.ios = 2;152         }153     }154 155     //检测Android版本156     if (/Android (\d+\.\d+)/.test(ua)) {157         system.android = parseFloat(RegExp.$1);158     }159 160     //游戏系统161     system.wii = ua.indexOf("Will") > -1;162     system.ps = /playstation/i.test(ua);163     //返回这些对象164     return {165         engine: engine,166         browser: browser,167         system: system168     };169 } ();