ajax.js

//=========================================
//  数据交互模块
//==========================================
//var reg = /^[^\u4E00-\u9FA5]*$/;
define("ajax", ["mass", "$interact"], function($) {
    var global = this,
    DOC = global.document,
    r20 = /%20/g,
    rCRLF = /\r?\n/g,
    encode = encodeURIComponent,
    decode = decodeURIComponent,
    rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg,
    // IE的换行符不包含 \r
    rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
    rnoContent = /^(?:GET|HEAD)$/,
    rquery = /\?/,
    rurl = /^([\w.+-]+:)(?:\/\/([^\/?#:]*)(?::(\d+)|)|)/,
    //在IE下如果重置了document.domain，直接访问window.location会抛错，但用document.URL就ok了
    //http://www.cnblogs.com/WuQiang/archive/2012/09/21/2697474.html
    curl = DOC.URL,
    segments = rurl.exec(curl.toLowerCase()) || [],
    //http://www.cnblogs.com/rubylouvre/archive/2010/04/20/1716486.html
    s = ["XMLHttpRequest", "ActiveXObject('Msxml2.XMLHTTP.6.0')", "ActiveXObject('Msxml2.XMLHTTP.3.0')", "ActiveXObject('Msxml2.XMLHTTP')", "ActiveXObject('Microsoft.XMLHTTP')"];
    if(!+"\v1") {
        var v = DOC.documentMode;
        s[0] = v == 8 ? "XDomainRequest" : location.protocol === "file:" ? "!" : s[0]
    }
    for(var i = 0, axo; axo = s[i++];) {
        try {
            if(eval("new " + axo)) {
                $.xhr = new Function("return new " + axo);
                break;
            }
        } catch(e) {}
    }

    var accepts = {
        xml: "application/xml, text/xml",
        html: "text/html",
        text: "text/plain",
        json: "application/json, text/javascript",
        script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript",
        "*": ["*/"] + ["*"] //避免被压缩掉
    },
    defaults = {
        type: "GET",
        contentType: "application/x-www-form-urlencoded; charset=UTF-8",
        async: true,
        jsonp: "callback"
    };
    //将data转换为字符串，type转换为大写，添加hasContent，crossDomain属性，如果是GET，将参数绑在URL后面


    function setOptions(opts) {
        opts = $.Object.merge({}, defaults, opts);
        if(opts.crossDomain == null) { //判定是否跨域
            var parts = rurl.exec(opts.url.toLowerCase());
            opts.crossDomain = !! (parts && (parts[1] !== segments[1] || parts[2] !== segments[2] || (parts[3] || (parts[1] === "http:" ? 80 : 443)) != (segments[3] || (segments[1] === "http:" ? 80 : 443))));
        }
        if(opts.data && opts.data !== "string") {
            opts.data = $.param(opts.data);
        }
        opts.url = opts.url.replace(/#.*$/, "").replace(/^\/\//, segments[1] + "//");
        opts.type = opts.type.toUpperCase();
        opts.hasContent = !rnoContent.test(opts.type); //是否为post请求
        if(!opts.hasContent) {
            if(opts.data) { //如果为GET请求,则参数依附于url上
                opts.url += (rquery.test(opts.url) ? "&" : "?") + opts.data;
            }
            if(opts.cache === false) { //添加时间截
                opts.url += (rquery.test(opts.url) ? "&" : "?") + "_time=" + Date.now();
            }
        }
        return opts;
    }

    "get,post".replace($.rword, function(method) {
        $[method] = function(url, data, callback, type) {
            if($.isFunction(data)) {
                type = type || callback;
                callback = data;
                data = undefined;
            }
            return $.ajax({
                type: method,
                url: url,
                data: data,
                success: callback,
                dataType: type
            });
        };

    });

    function isValidParamValue(val) {
        var t = typeof val; // If the type of val is null, undefined, number, string, boolean, return true.
        return val == null || (t !== 'object' && t !== 'function');
    }
    $.mix($, {
        getScript: function(url, callback) {
            return $.get(url, null, callback, "script");
        },

        getJSON: function(url, data, callback) {
            return $.get(url, data, callback, "jsonp");
        },

        /**无刷新上传
         * @param {String} url 提交地址
         * @param {HTMLElement} 元素
         * @param {Object} data 普通对象（用于添加额外参数）
         * @param {Function} 成功回调，它的参数依次是
         * 1. data returned from this request with type specified by dataType<br/>
         * 2. status of this request with type String<br/>
         * 3. XhrObject of this request , for details {@link IO.XhrObject}
         * @param {String} [dataType] 注明要返回何种数据类型("xml" or "json" or "text")
         * @returns {IO.XhrObject}
         */
        upload: function(url, form, data, callback, dataType) {
            if($.isFunction(data)) {
                dataType = callback;
                callback = data;
                data = undefined;
            }
            return $.ajax({
                url: url,
                type: 'post',
                dataType: dataType,
                form: form,
                data: data,
                success: callback
            });
        },
        //将一个对象转换为字符串
        param: function(json, bracket) {
            if(!$.isPlainObject(json)) {
                return "";
            }
            bracket = typeof serializeArray == "boolean" ? bracket : !0;
            var buf = [],
            key, val;
            for(key in json) {
                if(json.hasOwnProperty(key)) {
                    val = json[key];
                    key = encode(key);
                    if(isValidParamValue(val)) { //只处理基本数据类型,忽略空数组,函数,正则,日期,节点等
                        buf.push(key, "=", encode(val + ""), "&");
                    } else if(Array.isArray(val) && val.length) { //不能为空数组
                        for(var i = 0, n = val.length; i < n; i++) {
                            if(isValidParamValue(val[i])) {
                                buf.push(key, (bracket ? encode("[]") : ""), "=", encode(val[i] + ""), "&");
                            }
                        }
                    }
                }
            }
            buf.pop();
            return buf.join("").replace(r20, "+");
        },
        //将一个字符串转换为对象
        //$.deparam = jq_deparam = function( params, coerce ) {
        //https://github.com/cowboy/jquery-bbq/blob/master/jquery.ba-bbq.js
        unparam: function(url, query) {
            var json = {};
            if(!url || !$.type(url, "String")) {
                return json
            }
            url = url.replace(/^[^?=]*\?/ig, '').split('#')[0]; //去除网址与hash信息
            //考虑到key中可能有特殊符号如“[].”等，而[]却有是否被编码的可能，所以，牺牲效率以求严谨，就算传了key参数，也是全部解析url。
            var pairs = url.split("&"),
            pair, key, val, i = 0,
            len = pairs.length;
            for(; i < len; ++i) {
                pair = pairs[i].split("=");
                key = decode(pair[0]);
                try {
                    val = decode(pair[1] || "");
                } catch(e) {
                    $.log(e + "decodeURIComponent error : " + pair[1], 3);
                    val = pair[1] || "";
                }
                key = key.replace(/\[\]$/, "") //如果参数名以[]结尾，则当作数组
                var item = json[key];
                if(item === void 0) {
                    json[key] = val; //第一次
                } else if(Array.isArray(item)) {
                    item.push(val); //第三次或三次以上
                } else {
                    json[key] = [item, val]; //第二次,将它转换为数组
                }
            }
            return query ? json[query] : json;
        },
        serialize: function(form) { //表单元素变字符串
            var json = {};
            // 不直接转换form.elements，防止以下情况：   <form > <input name="elements"/><input name="test"/></form>
            $.filter(form || [], function(el) {
                return el.name && !el.disabled && (el.checked === true || /radio|checkbox/.test(el.type))
            }).forEach(function(el) {
                var val = $(el).val(),
                vs;
                val = Array.isArray(val) ? val : [val];
                val = val.map(function(v) {
                    return v.replace(rCRLF, "\r\n");
                });
                // 全部搞成数组，防止同名
                vs = json[el.name] || (json[el.name] = []);
                vs.push.apply(vs, val);
            });
            return $.param(json, false); // 名值键值对序列化,数组元素名字前不加 []
        }
    });
    /*=============================================================================================
    从这里开始是数据交互模块的核心,包含一个ajax方法,ajaxflow对象,传送器集合,转换器集合
    =============================================================================================*/
    var ajaxflow = new $.Flow
    var transports = {} //传送器，我们可以通过XMLHttpRequest, Script, Iframe与后端
    var converters = { //转换器，返回用户想要做的数据（从原始返回值中提取加工）
        text: function(xhr, text, xml) {
            return text != undefined ? text : ("xml" in xml ? xml.xml : new XMLSerializer().serializeToString(xml));
        },
        xml: function(xhr, text, xml) {
            return xml != undefined ? xml : $.parseXML(text);
        },
        html: function(xhr, text, xml) {
            return $.parseHTML(text);
        },
        json: function(xhr, text, xml) {
            return $.parseJSON(text);
        },
        script: function(xhr, text, xml) {
            $.parseJS(text);
        }
    }
    var ajax = $.ajax = function(opts) {
        if(!opts || !opts.url) {
            $.error("参数必须为Object并且拥有url属性" );
        }
        opts = setOptions(opts); //规整化参数对象
        //创建一个伪XMLHttpRequest,能处理complete,success,error等多投事件
        var dummyXHR = new $.XHR(opts),
        dataType = opts.dataType;
        if(opts.form && opts.form.nodeType === 1) {
            dataType = "iframe";
        } else if(dataType == "jsonp") {
            if(opts.crossDomain) { // opts.crossDomain &&
                $.log("使用script发出JSONP请求")
                ajaxflow.fire("start", dummyXHR, opts.url, opts.jsonp, opts.jsonpCallback); //用于jsonp请求
                dataType = "script"
            } else {
                dataType = dummyXHR.options.dataType = "json";
            }
        }
        var transportContructor = transports[dataType] || transports._default,
        transport = new transportContructor();
        transport.dummyXHR = dummyXHR;
        dummyXHR.transport = transport;
        if(opts.contentType) {
            dummyXHR.setRequestHeader("Content-Type", opts.contentType);
        }
        //添加dataType所需要的Accept首部
        dummyXHR.setRequestHeader("Accept", accepts[dataType] ? accepts[dataType] + ", */*; q=0.01" : accepts["*"]);
        for(var i in opts.headers) {
            dummyXHR.setRequestHeader(i, opts.headers[i]);
        }
        "complete success error".replace($.rword, function(name) {
            if(typeof opts[name] === "function") {
                dummyXHR.addEventListener(name, opts[name])
                delete opts[name];
            }
        });
        dummyXHR.readyState = 1;
        // 处理超时
        if(opts.async && opts.timeout > 0) {
            dummyXHR.timeoutID = setTimeout(function() {
                dummyXHR.abort("timeout");
            }, opts.timeout);
        }
        try {
            dummyXHR.state = 1; //已发送
            transport.request();
        } catch(e) {
            if(dummyXHR.status < 2) {
                dummyXHR.dispatch(-1, e);
            } else {
                $.log(e);
            }
        }
        return dummyXHR;
    }

    ajax.isLocal = rlocalProtocol.test(segments[1]);
    /**
     * XHR类,用于模拟原生XMLHttpRequest的所有行为
     * var ajax = new(self.XMLHttpRequest||ActiveXObject)("Microsoft.XMLHTTP")
     * ajax.onreadystatechange = function(){
     *   if (ajax.readyState==4 && ajax.status==200){
     *        alert(ajax.responseText)
     *   }
     * }
     * ajax.open("POST", url, true);
     * ajax.send("key=val&key1=val2");
     */
    $.XHR = $.factory({
        inherit: $.Flow,
        init: function(opts) {
            $.mix(this, {
                responseData: null,
                timeoutID: null,
                responseText: null,
                responseXML: null,
                statusText: null,
                transport: null,
                responseHeadersString: "",
                responseHeaders: {},
                requestHeaders: {},
                readyState: 0,
                //internal state
                state: 0,
                status: 0
            });
            this.setOptions("options", opts); //创建一个options保存原始参数
        },
        setRequestHeader: function(name, value) {
            this.requestHeaders[name] = value;
            return this;
        },
        getAllResponseHeaders: function() {
            return this.state === 2 ? this.responseHeadersString : null;
        },
        getResponseHeader: function(name, match) {
            if(this.state === 2) {
                while((match = rheaders.exec(this.responseHeadersString))) {
                    this.responseHeaders[match[1]] = match[2];
                }
                match = this.responseHeaders[name];
            }
            return match === undefined ? null : match;
        },
        overrideMimeType: function(type) {
            // 只有在没有发出请求前才能重写 content-type 首部
            if(!this.state) {
                this.mimeType = type;
            }
            return this;
        },
        toString: function() {
            return "[object XMLHttpRequest]"
        },
        // 中止请求
        abort: function(statusText) {
            statusText = statusText || "abort";
            if(this.transport) {
                this.transport.respond(0, 1);
            }
            this.dispatch(0, statusText);
            return this;
        },
        /**
         * 用于派发success,error,complete等回调
         * http://www.cnblogs.com/rubylouvre/archive/2011/05/18/2049989.html
         * @param {Number} status 状态码
         * @param {String} statusText 对应的扼要描述
         */
        dispatch: function(status, statusText) {
            // 只能执行一次，防止重复执行
            if(this.state == 2) { //2:已执行回调
                return;
            }
            this.state = 2;
            this.readyState = 4;
            var eventType = "error";
            if(status >= 200 && status < 300 || status == 304) {
                if(status == 304) {
                    statusText = "notmodified";
                    eventType = "success";
                } else {
                    try {
                        var dataType = this.options.dataType || this.options.mimeType || this.nativeXHR && this.nativeXHR.responseType;
                        if(!dataType) { //如果没有指定dataType，则根据mimeType或Content-Type进行揣测
                            dataType = this.getResponseHeader("Content-Type") || "";
                            dataType = dataType.match(/json|xml|script|html/) || ["text"];
                            dataType = dataType[0]
                        }
                        this.responseData = converters[dataType](this, this.responseText, this.responseXML);
                        eventType = statusText = "success";
                        $.log("dummyXHR.dispatch success");
                    } catch(e) {
                        $.log("dummyXHR.dispatch parsererror")
                        statusText = "parsererror : " + e;
                    }
                }
            } else if(status < 0) {
                status = 0;
            }
            this.status = status;
            this.statusText = statusText;
            if(this.timeoutID) {
                clearTimeout(this.timeoutID);
                delete this.timeoutID;
            }
            // 到这要么成功，调用success, 要么失败，调用 error, 最终都会调用 complete
            this.fire(eventType, this.responseData, statusText);
            ajaxflow.fire(eventType);
            this.fire("complete", this.responseData, statusText);
            ajaxflow.fire("complete");
            delete this.transport;
        }
    });


    if($.xhr) {
        var nativeXHR = new $.xhr,
        allowCrossDomain = false;
        if("withCredentials" in nativeXHR) {
            allowCrossDomain = true;
        }
        //【XMLHttpRequest】传送器
        transports._default = $.factory({
            //发送请求
            request: function() {
                var dummyXHR = this.dummyXHR,
                options = dummyXHR.options,
                i;
                $.log("XhrTransport.sending.....");
                if(options.crossDomain && !allowCrossDomain) {
                    $.error("本浏览器不支持crossdomain xhr")
                }
                var nativeXHR = this.nativeXHR = new $.xhr,
                self = this;
                if(options.username) {
                    nativeXHR.open(options.type, options.url, options.async, options.username, options.password);
                } else {
                    nativeXHR.open(options.type, options.url, options.async);
                }
                // 如果支持overrideMimeTypeAPI
                if(dummyXHR.mimeType && nativeXHR.overrideMimeType) {
                    nativeXHR.overrideMimeType(dummyXHR.mimeType);
                }
                if(!options.crossDomain && !dummyXHR.requestHeaders["X-Requested-With"]) {
                    dummyXHR.requestHeaders["X-Requested-With"] = "XMLHttpRequest";
                }
                try {
                    for(i in dummyXHR.requestHeaders) {
                        nativeXHR.setRequestHeader(i, dummyXHR.requestHeaders[i]);
                    }
                } catch(e) {
                    $.log(" nativeXHR setRequestHeader occur error ");
                }

                nativeXHR.send(options.hasContent && options.data || null);
                //在同步模式中,IE6,7可能会直接从缓存中读取数据而不会发出请求,因此我们需要手动发出请求
                if(!options.async || nativeXHR.readyState == 4) {
                    this.respond();
                } else {
                    if(nativeXHR.onerror === null) { //如果支持onerror, onload新API
                        nativeXHR.onload = nativeXHR.onerror = function(e) {
                            this.readyState = 4; //IE9
                            this.status = e.type === "load" ? 200 : 500;
                            self.respond();
                        };
                    } else {
                        nativeXHR.onreadystatechange = function() {
                            self.respond();
                        }
                    }
                }
            },
            //用于获取原始的responseXMLresponseText 修正status statusText
            //第二个参数为1时中止清求
            respond: function(event, abort) {
                // 如果网络问题时访问XHR的属性，在FF会抛异常
                // http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
                var nativeXHR = this.nativeXHR,
                dummyXHR = this.dummyXHR,
                detachEvent = false;
                try {
                    if(abort || nativeXHR.readyState == 4) {
                        detachEvent = true;
                        if(abort) {
                            if(nativeXHR.readyState !== 4) { // 完成以后 abort 不要调用
                                //IE的XMLHttpRequest.abort实现于 MSXML 3.0+
                                //http://blogs.msdn.com/b/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
                                nativeXHR.abort();
                            }
                        } else {
                            var status = nativeXHR.status,
                            xml = nativeXHR.responseXML;
                            dummyXHR.responseHeadersString = nativeXHR.getAllResponseHeaders();
                            // Construct response list
                            if(xml && xml.documentElement /* #4958 */ ) {
                                dummyXHR.responseXML = xml;
                            }
                            dummyXHR.responseText = nativeXHR.responseText;
                            //火狐在跨城请求时访问statusText值会抛出异常
                            try {
                                var statusText = nativeXHR.statusText;
                            } catch(e) {
                                $.log("xhr statustext error : " + e, 3);
                                statusText = "";
                            }
                            //用于处理特殊情况,如果是一个本地请求,只要我们能获取数据就假当它是成功的
                            if(!status && ajax.isLocal && !dummyXHR.options.crossDomain) {
                                status = dummyXHR.responseText ? 200 : 404;
                            //IE有时会把204当作为1223
                            //returning a 204 from a PUT request - IE seems to be handling the 204 from a DELETE request okay.
                            } else if(status === 1223) {
                                status = 204;
                            }
                            dummyXHR.dispatch(status, statusText);
                        }
                    }
                } catch(firefoxAccessException) {
                    detachEvent = true;
                    $.log(firefoxAccessException);
                    if(!abort) {
                        dummyXHR.dispatch(-1, firefoxAccessException + "");
                    }
                } finally {
                    if(detachEvent) {
                        nativeXHR.onerror = nativeXHR.onload = nativeXHR.onreadystatechange = $.noop;
                    }
                }
            }
        });
    }
    //【script节点】传送器，只用于跨域的情况
    transports.script = $.factory({
        request: function() {
            var self = this,
            dummyXHR = self.dummyXHR,
            options = dummyXHR.options,
            head = $.head,
            script = self.script = DOC.createElement("script");
            $.log("ScriptTransport.sending.....");
            if(options.charset) {
                script.charset = options.charset;
            }
            //当script的资源非JS文件时,发生的错误不可捕获
            script.onerror = script[script.uniqueID ? "onreadystatechange" : "onload"] = function(e) {
                e = e || event;
                self.respond((e.type || "error").toLowerCase()); // firefox onerror 没有 type ?!
            };
            script.src = options.url
            head.insertBefore(script, head.firstChild);
        },

        respond: function(event, isAbort) {
            var node = this.script,
            dummyXHR = this.dummyXHR;
            // 防止重复调用,成功后 abort
            if(!node) {
                return;
            }
            if(isAbort || /loaded|complete|undefined/i.test(node.readyState) || event == "error") {
                node.onerror = node.onload = node.onreadystatechange = null;
                var parent = node.parentNode;
                if(parent && parent.nodeType === 1) {
                    parent.removeChild(node);
                    delete this.script;
                }
                //如果没有中止请求并没有报错
                if(!isAbort && event != "error") {
                    dummyXHR.dispatch(200, "success");
                }
                // 非 ie<9 可以判断出来
                else if(event == "error") {
                    dummyXHR.dispatch(500, "scripterror");
                }
            }
        }
    });

    //http://www.decimage.com/web/javascript-cross-domain-solution-with-jsonp.html
    //JSONP请求，借用【script节点】传送器
    converters["jsonp"] = function(xhr) {
        var json = $[xhr.jsonp];
        delete $[xhr.jsonp];
        return json;
    }
    ajaxflow.bind("start", function(e, dummyXHR, url, jsonp, jsonpCallback) {
        $.log("jsonp start...");
        var namespace = DOC.URL.replace(/(#.+|\W)/g, '');
        jsonpCallback = dummyXHR.jsonp = jsonpCallback || "jsonp" + dummyXHR.uuid().replace(/-/g, "");
        dummyXHR.options.url = url + (rquery.test(url) ? "&" : "?") + jsonp + "=" + namespace + "." + jsonpCallback;
        dummyXHR.options.dataType = "jsonp";
        //将后台返回的json保存在惰性函数中
        global[namespace][jsonpCallback] = function(json) {
            $[jsonpCallback] = json;
        };
    });

    function createIframe(dummyXHR, transport) {
        var id = "iframe-upload-" + dummyXHR.uniqueID;
        var iframe = $.parseHTML("<iframe " + " id='" + id + "'" + " name='" + id + "'" + " style='position:absolute;left:-9999px;top:-9999px;/>").firstChild;
        iframe.transport = transport;
        return(DOC.body || DOC.documentElement).insertBefore(iframe, null);
    }

    function addDataToForm(data, form, serializeArray) {
        data = $.unparam(data);
        var ret = [],
        d, isArray, vs, i, e;
        for(d in data) {
            isArray = Array.isArray(data[d]);
            vs = isArray ? data[d] : [data[d]]
            // 数组和原生一样对待，创建多个同名输入域
            for(i = 0; i < vs.length; i++) {
                e = DOC.createElement("input");
                e.type = 'hidden';
                e.name = d + (isArray && serializeArray ? "[]" : "");
                e.value = vs[i];
                form.appendChild(e)
                ret.push(e);
            }
        }
        return ret;
    }
    //【iframe】传送器，专门用于上传
    //http://www.profilepicture.co.uk/tutorials/ajax-file-upload-xmlhttprequest-level-2/ 上传
    transports.iframe = $.factory({
        request: function() {
            var dummyXHR = this.dummyXHR,
            options = dummyXHR.options,
            form = options.form
            //form.enctype的值
            //1:application/x-www-form-urlencoded   在发送前编码所有字符（默认）
            //2:multipart/form-data 不对字符编码。在使用包含文件上传控件的表单时，必须使用该值。
            //3:text/plain  空格转换为 "+" 加号，但不对特殊字符编码。
            this.backups = {
                target: form.target || "",
                action: form.action || "",
                enctype: form.enctype,
                method: form.method
            };
            var iframe = createIframe(dummyXHR, this);
            //必须指定method与enctype，要不在FF报错
            //“表单包含了一个文件输入元素，但是其中缺少 method=POST 以及 enctype=multipart/form-data，所以文件将不会被发送。”
            // 设置target到隐藏iframe，避免整页刷新
            form.target = "iframe-upload-" + dummyXHR.uniqueID;
            form.action = options.url;
            form.method = "POST";
            form.enctype = "multipart/form-data";
            this.fields = options.data ? addDataToForm(options.data, form) : [];
            this.form = form; //一个表单元素
            $.log("iframe transport...");
            setTimeout(function() {
                $(iframe).bind("load error", this.respond);
                form.submit();
            });
        },

        respond: function(event) {
            var iframe = this,
            transport = iframe.transport;
            // 防止重复调用 , 成功后 abort
            if(!transport) {
                return;
            }
            $.log("transports.iframe respond")
            var form = transport.form,
            eventType = event.type,
            dummyXHR = transport.dummyXHR;
            iframe.transport = undefined;
            if(eventType == "load") {
                var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document;
                var iframeDoc = iframe.contentWindow.document;
                if(doc.XMLDocument) {
                    dummyXHR.responseXML = doc.XMLDocument;
                } else if(doc.body) {
                    // response is html document or plain text
                    dummyXHR.responseText = doc.body.innerHTML;
                    dummyXHR.responseXML = iframeDoc;
                    //当，MIME为"text/plain",浏览器会把文本放到一个PRE标签中
                    if(doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == 'PRE') {
                        dummyXHR.responseText = doc.body.firstChild.firstChild.nodeValue;
                    }
                } else {
                    // response is a xml document
                    dummyXHR.responseXML = doc;
                }
                dummyXHR.dispatch(200, "success");
            } else if(eventType == 'error') {
                dummyXHR.dispatch(500, "error");
            }
            for(var i in transport.backups) {
                form[i] = transport.backups[i];
            }
            //还原form的属性
            transport.fields.forEach(function(elem) {
                elem.parentNode.removeChild(elem);
            });
            $(iframe).unbind("load", transport.respond).unbind("error", transport.respond);
            iframe.clearAttributes && iframe.clearAttributes();
            setTimeout(function() {
                // Fix busy state in FF3
                iframe.parentNode.removeChild(iframe);
                $.log("iframe.parentNode.removeChild(iframe)")
            });
        }
    });
    return $;
});
/**
2011.8.31
将会传送器的abort方法上传到$.XHR.abort去处理
修复serializeArray的bug
对XMLHttpRequest.abort进行try...catch
2012.3.31 v2 大重构,支持XMLHttpRequest Level2
 */