JS判断浏览器类型

/*
判断浏览器类型
返回值 object
  name：浏览器名
  version：浏览器版本
  ie:是否IE,
  firefox:是否firefox,
  opera:是否opera,
  chrome:是否chrome,
  safari:是否safari
*/
function getBrowser() {
	var na = navigator.userAgent.toLowerCase();
	var bo = {name:"unknown", version:"unknown", ie:false, firefox:false, opera:false, chrome:false, safari:false};
	if (na.match(/msie/)) {
		bo.name = "msie";
		bo.version = na.match(/msie ([\d.]+)/)[1];
		bo.ie = true;
	} else {
		if (na.match(/firefox/)) {
			bo.name = "firefox";
			bo.version = na.match(/firefox\/([\d.]+)/)[1];
			bo.firefox = true;
		} else {
			if (na.match(/opera/)) {
				bo.name = "opera";
				bo.version = na.match(/opera.([\d.]+)/)[1];
				bo.opera = true;
			} else {
				if (na.match(/chrome/)) {
					bo.name = "chrome";
					bo.version = na.match(/chrome\/([\d.]+)/)[1];
					bo.chrome = true;
				} else {
					if (na.match(/mobile safari/)) {
						bo.name = "mobileSafari";
						bo.version = na.match(/version\/([\d.]+)/) ? na.match(/version\/([\d.]+)/)[1] : "unknown";
						bo.safari = true;
					} else {
						if (na.match(/safari/)) {
							bo.name = "safari";
							bo.version = na.match(/version\/([\d.]+)/)[1];
							bo.safari = true;
						}
					}
				}
			}
		}
	}
	return (bo);
}