function getExplorerInfo() {
            var explorer = window.navigator.userAgent.toLowerCase();
            //ie
            if (explorer.indexOf("msie") >= 0) {
                var ver = explorer.match(/msie ([\d.]+)/)[1];
                return { type: "IE", version: ver };
            }
            //firefox
            else if (explorer.indexOf("firefox") >= 0) {
                var ver = explorer.match(/firefox\/([\d.]+)/)[1];
                return { type: "Firefox", version: ver };
            }
            //Chrome
            else if (explorer.indexOf("chrome") >= 0) {
                var ver = explorer.match(/chrome\/([\d.]+)/)[1];
                return { type: "Chrome", version: ver };
            }
            //Opera
            else if (explorer.indexOf("opera") >= 0) {
                var ver = explorer.match(/opera.([\d.]+)/)[1];
                return { type: "Opera", version: ver };
            }
            //Safari
            else if (explorer.indexOf("Safari") >= 0) {
                var ver = explorer.match(/version\/([\d.]+)/)[1];
                return { type: "Safari", version: ver };
            }
        }

    alert("浏览器:" + getExplorerInfo().type + "\n 版本:" + getExplorerInfo().version);