User Agent

使用 User Agent 输出浏览器信息

Browser = (function(ua){
				var b = {
					msie: /msie/.test(ua) && !/opera/.test(ua),
					opera: /opera/.test(ua),
					safari: /webkit/.test(ua) && !/chrome/.test(ua),
					firefox: /firefox/.test(ua),
					chrome: /chrome/.test(ua)
				};
				var vMark = "";
				for (var i in b) {
					if (b[i]) { vMark = "safari" == i ? "version" : i; break; }
				}
				b.version = vMark && RegExp("(?:" + vMark + ")[\\/: ]([\\d.]+)").test(ua) ? RegExp.$1 : "0";
				
				b.ie = b.msie;
				b.ie6 = b.msie && parseInt(b.version, 10) == 6;
				b.ie7 = b.msie && parseInt(b.version, 10) == 7;
				b.ie8 = b.msie && parseInt(b.version, 10) == 8;
				
				return b;
			})(window.navigator.userAgent.toLowerCase());