判断浏览器以及有关版本

判断浏览器以及相关版本
做web开发，少不了要兼容多个浏览器，所以自己参照别人的代码自己写了个，这里留下做备用!

jsManager={};
//判断浏览器类型
jsManager.browser = new function() {
	this.isIE = false;
	this.isFF = false;
	this.isChrome = false;
	this.isOpera = false;
	this.isSafari = false;
	this.isUnknown = true;

	this.version = null;
	this.type = null;

	this.getBrowserInfo = function() {
		var ua = navigator.userAgent.toLowerCase();
		if (window.ActiveXObject) {
			this.isIE = true;
			this.isUnknown = false;
			this.type = "IE";
			this.version = ua.match(/msie ([\d.]+)/)[1];
		} else if (document.getBoxObjectFor) {
			this.isFF = true;
			this.isUnknown = false;
			this.type = "FireFox";
			this.version = ua.match(/firefox\/([\d.]+)/)[1];
		} else if (window.MessageEvent && !document.getBoxObjectFor) {
			this.isChrome = true;
			this.isUnknown = false;
			this.type = "CHROME";
			this.version = ua.match(/chrome\/([\d.]+)/)[1];
		} else if (window.opera) {
			this.isOpera = true;
			this.isUnknown = false;
			this.type = "OPERA";
			this.version = ua.match(/opera.([\d.]+)/)[1];
		} else if (window.openDatabase) {
			this.isSafari = true;
			this.isUnknown = false;
			this.type = "SAFARI";
			this.version = ua.match(/version\/([\d.]+)/)[1];
		}
	}
	this.toString = function() {
		if (this.isUnknown) {
			return "Other Browser";
		} else {
			return this.type + " " + this.version;
		}
	};
}

jsManager.browser.getBrowserInfo();

上面其实很简单，很好理解！
只要用alert(jsManager.browser)就可以得到相关信息