判断是不是ie浏览器 加上ie11

var b_version = navigator.appVersion;
                    var version = b_version.split(";");
                    var trim_Version = version[1].replace(/[ ]/g, "");//ie8 - 10【1】才是msie
                    if (trim_Version.substring(0, 4) == "MSIE") {
                        trim_Version = version[4].replace(/[ ]/g, "");//ie8 - 10
                    } else {
                        trim_Version = version[2].replace(/[ ]/g, "");//ie11 只有ie11才是[2]
                    }
                    if (trim_Version.substring(0, 7) == "Trident") {
                        if (event.currentTarget.attributes[0].ownerDocument.activeElement.menuCode == 'sjdp') {//只有ie8这样才能找到menuCOde
                            alert('您用的是ie浏览器，建议用chrome浏览器打开');
                        } else if (event.currentTarget.attributes[0].ownerDocument.activeElement.attributes[3].nodeValue == 'sjdp') {
                            //ie8以上这样才能找到menuCOde
                            alert('您用的是ie浏览器，建议用chrome浏览器打开');
                        }

                    }

 但是苹果系统就有报错 最后就只判断内核就完事了

    var b_version = navigator.appVersion;
                    if (b_version.indexOf('Trident') > -1) {
                        alert('您用的是ie浏览器，建议用chrome浏览器打开');
                    }

indexOf ie8判断字符串是可以的 数组的话需要兼容一下

if (!Array.prototype.indexOf){
                    Array.prototype.indexOf = function(elt /*, from*/){
                        var len = this.length >>> 0;
                        var from = Number(arguments[1]) || 0;
                        from = (from < 0)
                            ? Math.ceil(from)
                            : Math.floor(from);
                        if (from < 0)
                        from += len;

                        for (; from < len; from++)
                        {
                        if (from in this &&
                            this[from] === elt)
                            return from;
                        }
                        return -1;
                    };
                }