cnzz統計検査ブラウザの原理(ブラウザにまたがって実用的なソースを開発する)

(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('        → '+Client.engine.type+':'+Client.engine.version);

var browser = { se360: '360     ', se: '       ', maxthon: '  ', qq: 'QQ   ', tt: '  TT', theworld: '    ', cometbrowser: '     ', greenbrowser: 'GreenBrowser', ie: '  IE', chrome: '  Chrome', netscape: '  ', firefox: '  ', opera: 'Opera', safari: '  Safari', konq: 'Konqueror' };

document.writeln('      → '+browser[Client.browser.type]+':'+Client.browser.version);

if(Client.engine.ie) { alert('     IE     ！'); };

if(Client.engine.ie && Client.engine.ie < 8 ) { alert('     IE     ，      IE8！'); };