JavaScript 浏览器类型及版本号

function getBrowserInfo(userAgent) {

            var browserName, browserVersion;

            if (userAgent.indexOf("MSIE") > -1) {
                var types = userAgent.substring(userAgent.indexOf("MSIE"));
                var Info = (types.split(";")[0]).split(" ");
                browserName = Info[0];
                browserVersion = Info[1];
            } else if (userAgent.indexOf("Firefox") > -1) {
                var types = userAgent.substring(userAgent.indexOf("Firefox"));
                var Info = (types.split(" ")[0]).split("/");
                browserName = Info[0];
                browserVersion = Info[1];
            } else if (userAgent.indexOf("Chrome") > -1) {
                var types = userAgent.substring(userAgent.indexOf("Chrome"));
                var Info = (types.split(" ")[0]).split("/");
                browserName = Info[0];
                browserVersion = Info[1];
            } else if (userAgent.indexOf("Opera") > -1) {
                var types = userAgent.substring(userAgent.indexOf("Opera"));
                var Info = (types.split(" ")[0]).split("/");
                browserName = Info[0];
                browserVersion = Info[1];
            } else if (userAgent.indexOf("Safari") > -1) {
                var types = userAgent.substring(userAgent.indexOf("Safari"));
                var Info = (types.split(" ")[0]).split("/");
                browserName = Info[0];
                browserVersion = Info[1];
            } else if (userAgent.indexOf("rv") > -1) { // for IE11
                var substring = userAgent.substring(userAgent.indexOf("rv"), userAgent.indexOf(")"));
                browserName = "MSIE";
                browserVersion = substring.split(":")[1];
            }
            if (browserVersion.indexOf(‘.‘) != -1) {
                browserVersion = browserVersion.substring(0, browserVersion.indexOf(‘.‘));
            }
            return browserName + "-" + browserVersion;
        }

getBrowserInfo(navigator.userAgent);