判断浏览器及版本

        function IEVersion() {
            var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串  
            var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器  
            var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器  
            var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
            if (isIE) {
                var reIE = new RegExp("MSIE (\d+\.\d+);");
                reIE.test(userAgent);
                var fIEVersion = parseFloat(RegExp["$1"]);
                if (fIEVersion == 7) {
                    return 7;
                } else if (fIEVersion == 8) {
                    return 8;
                } else if (fIEVersion == 9) {
                    return 9;
                } else if (fIEVersion == 10) {
                    return 10;
                } else {
                    return 6;//IE版本<=7
                }
            } else if (isEdge) {
                return 'edge';//edge
            } else if (isIE11) {
                return 11; //IE11  
            } else {
                //return -1;//不是ie浏览器

                //jq 1.9版本以上判断
                var matched, browser;
                jQuery.uaMatch = function (ua) {
                    ua = ua.toLowerCase();
                    var match = /(chrome)[ /]([w.]+)/.exec(ua) ||
                      /(webkit)[ /]([w.]+)/.exec(ua) ||
                      /(opera)(?:.*version|)[ /]([w.]+)/.exec(ua) ||
                      /(msie) ([w.]+)/.exec(ua) ||
                      ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([w.]+)|)/.exec(ua) ||
                      [];
                    return {
                        browser: match[1] || "",
                        version: match[2] || "0"
                    };
                };
                matched = jQuery.uaMatch(navigator.userAgent);
                browser = {};
                if (matched.browser) {
                    browser[matched.browser] = true;
                    browser.version = matched.version;
                }
                // Chrome is Webkit, but Webkit is also Safari.
                if (browser.chrome) {
                    browser.webkit = true;
                } else if (browser.webkit) {
                    browser.safari = true;
                }
                jQuery.browser = browser;
                //下面是直接写的判断，上面jq的获取方法
                if (matched.browser == 'chrome') {
                    return chrome
                }
                //chrome 

                //$.browser.mozilla = /firefox/.test(navigator.userAgent.toLowerCase());
                //$.browser.webkit = /webkit/.test(navigator.userAgent.toLowerCase());
                //$.browser.opera = /opera/.test(navigator.userAgent.toLowerCase());
                //$.browser.msie = /msie/.test(navigator.userAgent.toLowerCase());



            }
        }