(function (win) {
    var isSupportPlaceholder = function () {
        var input = document.createElement('input');
        return 'placeholder' in input;
    };
    //判断是否是IE浏览器，包括Edge浏览器
    var IEVersion = function() {
        //取得浏览器的userAgent字符串
        var userAgent = navigator.userAgent;
        //判断是否IE浏览器
        var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1;
        if (isIE) {
            var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
            reIE.test(userAgent);
            var fIEVersion = parseFloat(RegExp["$1"]);
            if (fIEVersion < 10 || !isSupportPlaceholder()) {
                return true;
            }
        }
        return false;
    };
    var Ajax = {
        get: function(url, fn) {
            // XMLHttpRequest对象用于在后台与服务器交换数据
            var xhr = new XMLHttpRequest();
            xhr.open('GET', url, true);
            xhr.onreadystatechange = function() {
                // readyState == 4说明请求已完成
                if (xhr.readyState == 4 && xhr.status == 200 || xhr.status == 304) {
                    // 从服务器获得数据
                    fn.call(this, xhr.responseText);
                }
            };
            xhr.send();
        }
    };
    var Brand = {
        init: function (config , url , html) {
            try {
                var iframe = document.createElement('<iframe name="brandFrame" id="brandFrame"></iframe>');
            } catch (e) {
                var iframe = document.createElement('iframe');
                iframe.name = 'brandFrame';
                iframe.id = 'brandFrame';
            }
            iframe.frameborder = "0";
            iframe.scrolling = "no";
            if(url != '') {
                iframe.src = url;
            }
            var style = {
                position: "fixed", "border": "0px", "z-index": "2247483647", "height": "440px", "width": "252px"
            };
            var dotop = config.num;
            style["top"] = this.getTop();
            switch (config.pos) {
                case 1 :
                    style["left"] = "0px";
                    break;
                case 2 :
                    style["right"] = "0px";
                    break;
            }
            style["marginTop"] = dotop + "px";
            this.style(iframe, style);
            document.body.appendChild(iframe);
            if(url == '') {
                var iframedocument = document.all ? iframe.contentWindow.document : iframe.contentDocument;
                iframedocument.open();
                iframedocument.write(html);
                iframedocument.close();
            }
        },
        style: function (obj, style) {
            for (var i in style) {
                obj.style[i] = style[i];
            }
        },
        getTop : function () {
            var myHeight = 0;
            if (typeof(window.innerHeight) == 'number') {
                //Non-IE
                myHeight = window.innerHeight;
            } else if (document.documentElement && (document.documentElement.clientHeight)) {
                //IE 6+ in 'standards compliant mode'
                myHeight = document.documentElement.clientHeight;
            } else if (document.body && (document.body.clientHeight)) {
                //IE 4 compatible
                myHeight = document.body.clientHeight;
            }
            var height = 440;
            return parseFloat((myHeight - height) / myHeight / 2).toFixed(2) * 100 + "%";
        }
    };
    //执行创建
    var runBrand = function () {
        if(IEVersion()) {
            Brand.init({"pos":1, "num":0} , 'https://www.bsan.org.cn/popshow.html?sn=CY2022D8D5QG5KD95&pos=1' , '');
        } else {
            Ajax.get('https://www.bsan.org.cn/popshow.html?sn=CY2022D8D5QG5KD95&pos=1', function (html) {
                Brand.init({"pos":1, "num":0} , '' , html);
            });
        }
    };
    runBrand();
    //安全性检测，假如发现对象不见了或者body为空了，则重新画
    var checkBrandSafe = function () {
        var needRun = false;
        var hasIframe = false;
        var iframmeCheck = document.getElementById("brandFrame");
        if(!iframmeCheck || iframmeCheck === undefined || iframmeCheck === null) {
            needRun = true;
        } else {
            hasIframe = true;
            var iframeBody = window.frames["brandFrame"].document.getElementsByTagName("body");
            if(!iframeBody || iframeBody === undefined || iframeBody === null || iframeBody.length < 1) {
                needRun = true;
            } else {
                var html = iframeBody[0].innerHTML;
                if(!html || html.indexOf("认证编号") === -1) {
                    needRun = true;
                }
            }
        }
        if(needRun) {
            if(hasIframe) {
                iframmeCheck.parentNode.removeChild(iframmeCheck);
            }
            runBrand();
        }
        setTimeout(checkBrandSafe , 3000);
    };
    setTimeout(checkBrandSafe , 1000);
})(window);