cnzz统计 检测浏览器原理（跨浏览器开发实用源码）
CNZZ根据用户代理字符串识别浏览器类型
JavaScript实现代码如下
(function() { var Client = function() {var engine = { ie: 0, webkit: 0, gecko: 0, opera: 0, khtml: 0 },browser = { se360: 0, se: 0, maxthon: 0, qq: 0, tt: 0, theworld: 0, cometbrowser: 0, greenbrowser: 0, ie: 0, chrome: 0, netscape: 0, firefox: 0, opera: 0, safari: 0, konq: 0 },ua = navigator.userAgent.toLowerCase();for (var type in engine) {if (typeof type === 'string') {var regexp = 'gecko' === type ? /rv:([\w.]+)/ : RegExp(type + '[ \\/]([\\w.]+)');if (regexp.test(ua)) {engine.version = window.opera ? window.opera.version() : RegExp.$1;engine[type] = parseFloat(engine.version);engine.type = type;break;}}}for (var type in browser) {if (typeof type === 'string') {var regexp = null;switch(type) {case "se360": regexp = /360se(?:[ \/]([\w.]+))?/; break;case "se": regexp = /se ([\w.]+)/; break;case "qq": regexp = /qqbrowser\/([\w.]+)/; break;case "tt": regexp = /tencenttraveler ([\w.]+)/; break;case "safari": regexp = /version\/([\w.]+)/; break;case "konq": regexp = /konqueror\/([\w.]+)/; break;case "netscape": regexp = /navigator\/([\w.]+)/; break;default: regexp = RegExp(type + '(?:[ \\/]([\\w.]+))?');}if (regexp.test(ua)) {browser.version = window.opera ? window.opera.version() : RegExp.$1 ? RegExp.$1 : 'unknown';browser[type] = parseFloat(browser.version);browser.type = type;break;}}}return { engine: engine, browser: browser };}();window.Client = Client;})();document.writeln('您的浏览器内核 → '+Client.engine.type+':'+Client.engine.version);var browser = { se360: '360安全浏览器', se: '搜狗高速浏览器', maxthon: '遨游', qq: 'QQ浏览器', tt: '腾讯TT', theworld: '世界之窗', cometbrowser: '彗星浏览器', greenbrowser: 'GreenBrowser', ie: '微软IE', chrome: '谷歌Chrome', netscape: '网景', firefox: '火狐', opera: 'Opera', safari: '苹果Safari', konq: 'Konqueror' };document.writeln('您的浏览器 → '+browser[Client.browser.type]+':'+Client.browser.version);if(Client.engine.ie) { alert('您使用的是IE内核浏览器！'); };if(Client.engine.ie && Client.engine.ie < 8 ) { alert('您使用的是IE内核浏览器，但是版本低于IE8！'); };