js关闭浏览器窗体

function closeWebPage() {
		if (navigator.userAgent.indexOf("MSIE") > 0) {
			if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {
				window.opener = null;
				window.close();
			} else {
				window.open('', '_top');
				window.top.close();
			}
		} else if (navigator.userAgent.indexOf("Firefox") > 0) {
			window.location.href = 'about:blank ';
		} else {
			window.opener = null;
			window.open('', '_self', '').close();
			window.close(); 
		}
	}