javascript高级程序设计 --- 浏览器检测、操作系统检测、浏览器内核检测
JavaScript 包含一个名为 Navigator 的对象，它就可以完成上述的任务。
Navigator 包含了有关访问者浏览器的信息，包括浏览器类型、版本等等
Navigator 对象
JavaScript Navigator 对象包含了有关访问者浏览器的所有信息。
接下来我们学习 Navigator 对象的两个属性userAgent、platform。
下面给出一个实例加以说明，client模块。通用模块。
var client = function() { //渲染模式 var engine = { ie: 0, gecko: 0, webkit: 0, khtml: 0, opera: 0, //complete version ver: null }; //浏览器类型 var browser = { //browsers ie: 0, firefox: 0, safari: 0, konq: 0, opera: 0, chrome: 0, //specific version ver: null }; //操作系统类型 var system = { win: false, mac: false, x11: false, //mobile devices iphone: false, ipod: false, ipad: false, ios: false, android: false, nokiaN: false, winMobile: false, //游戏机 wii: false, ps: false }; //侦测浏览器渲染模式及类型 var ua = navigator.userAgent; if (window.opera) { engine.ver = browser.ver = window.opera.version(); engine.opera = browser.opera = parseFloat(engine.ver); } else if (/AppleWebKit\/(\S+)/.test(ua)) { engine.ver = RegExp["$1"]; engine.webkit = parseFloat(engine.ver); //是否是Chrome if (/Chrome\/(\S+)/.test(ua)) { browser.ver = RegExp["$1"]; browser.chrome = parseFloat(browser.ver); } else if (/Version\/(\S+)/.test(ua)) { browser.ver = RegExp["$1"]; browser.safari = parseFloat(browser.ver); } else { //approximate version var safariVersion = 1; if (engine.webkit < 100) { safariVersion = 1; } else if (engine.webkit < 312) { safariVersion = 1.2; } else if (engine.webkit < 412) { safariVersion = 1.3; } else { safariVersion = 2; } browser.safari = browser.ver = safariVersion; } } else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) { engine.ver = browser.ver = RegExp["$1"]; engine.khtml = browser.konq = parseFloat(engine.ver); } else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)) { engine.ver = RegExp["$1"]; engine.gecko = parseFloat(engine.ver); //Firefox if (/Firefox\/(\S+)/.test(ua)) { browser.ver = RegExp["$1"]; browser.firefox = parseFloat(browser.ver); } } else if (/MSIE ([^;]+)/.test(ua)) { engine.ver = browser.ver = RegExp["$1"]; engine.ie = browser.ie = parseFloat(engine.ver); } //检测浏览器 browser.ie = engine.ie; browser.opera = engine.opera; //detect platform var p = navigator.platform; system.win = p.indexOf("Win") == 0; system.mac = p.indexOf("Mac") == 0; system.x11 = (p == "X11") || (p.indexOf("Linux") == 0); //侦测操作系统 if (system.win) { if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) { if (RegExp["$1"] == "NT") { switch (RegExp["$2"]) { case "5.0": system.win = "2000"; break; case "5.1": system.win = "XP"; break; case "6.0": system.win = "Vista"; break; case "6.1": system.win = "7"; break; default: system.win = "NT"; break; } } else if (RegExp["$1"] == "9x") { system.win = "ME"; } else { system.win = RegExp["$1"]; } } } //移动设备 system.iphone = ua.indexOf("iPhone") > -1; system.ipod = ua.indexOf("iPod") > -1; system.ipad = ua.indexOf("iPad") > -1; system.nokiaN = ua.indexOf("NokiaN") > -1; //winphohe if (system.win == "CE") { system.winMobile = system.win; } else if (system.win == "Ph") { if (/Windows Phone OS (\d+.\d+)/.test(ua)) {; system.win = "Phone"; system.winMobile = parseFloat(RegExp["$1"]); } } //苹果系列 if (system.mac && ua.indexOf("Mobile") > -1) { if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)) { system.ios = parseFloat(RegExp.$1.replace("_", ".")); } else { system.ios = 2; //can't really detect - so guess } } //andriod设备 if (/Android (\d+\.\d+)/.test(ua)) { system.android = parseFloat(RegExp.$1); } //游戏机 system.wii = ua.indexOf("Wii") > -1; system.ps = /playstation/i.test(ua); //返回对象 return { engine: engine, browser: browser, system: system }; }();
如何调用：
<!DOCTYPE html> <html> <head> <title>User-agent Detection Example</title> <script type="text/javascript" src="client.js"></script> </head> <body> <h2>Rendering Engines</h2> <ul> <li>client.engine.ie = <script>document.write(client.engine.ie);</script></li> <li>client.engine.webkit = <script>document.write(client.engine.webkit);</script></li> <li>client.engine.gecko = <script>document.write(client.engine.gecko);</script></li> <li>client.engine.khtml = <script>document.write(client.engine.khtml);</script></li> <li>client.engine.opera = <script>document.write(client.engine.opera);</script></li> <li>client.engine.ver = <script>document.write(client.engine.ver);</script></li> </ul> <h2>Browsers</h2> <ul> <li>client.browser.ie = <script>document.write(client.browser.ie);</script></li> <li>client.browser.safari = <script>document.write(client.browser.safari);</script></li> <li>client.browser.firefox = <script>document.write(client.browser.firefox);</script></li> <li>client.browser.konq = <script>document.write(client.browser.konq);</script></li> <li>client.browser.opera = <script>document.write(client.browser.opera);</script></li> <li>client.browser.chrome = <script>document.write(client.browser.chrome);</script></li> <li>client.browser.ver = <script>document.write(client.browser.ver);</script></li> </ul> <h2>System</h2> <ul> <li>client.system.win = <script>document.write(client.system.win);</script></li> <li>client.system.mac = <script>document.write(client.system.mac);</script></li> <li>client.system.x11 = <script>document.write(client.system.x11);</script></li> <li>client.system.iphone = <script>document.write(client.system.iphone);</script></li> <li>client.system.ipod = <script>document.write(client.system.ipod);</script></li> <li>client.system.ipad = <script>document.write(client.system.ipad);</script></li> <li>client.system.ios = <script>document.write(client.system.ios);</script></li> <li>client.system.android = <script>document.write(client.system.android);</script></li> <li>client.system.nokiaN = <script>document.write(client.system.nokiaN);</script></li> <li>client.system.winMobile = <script>document.write(client.system.winMobile);</script></li> <li>client.system.wii = <script>document.write(client.system.wii);</script></li> <li>client.system.ps = <script>document.write(client.system.ps);</script></li> </ul> </body> </html>
客户端显示如下：
