js怎么支持多浏览器关闭窗口

 	function closeme() {
		var browserName = navigator.appName;
		if (browserName == "Netscape") {
			window.open('', '_parent', '');
			window.close();
		} else if (browserName == "Microsoft Internet Explorer") {
			window.opener = "whocares";
			window.close();
		}
	}