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var dataTypeOrTransport = prefilterOrFactory(options, originalOptions, jqXHR);            /**             * 針對jonsp處理             */            if (typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[dataTypeOrTransport]) {                //增加cache設(shè)置標(biāo)記                //不需要緩存                //dataTypes: Array[2]                // 0: "script"                // 1: "json"                options.dataTypes.unshift(dataTypeOrTransport);                inspect(dataTypeOrTransport);                return false;            } else if (seekingTransport) {                return !(selected = dataTypeOrTransport);            }

// Detect, normalize options and install callbacks for jsonp requests// 向前置過濾器對象中添加特定類型的過濾器// 添加的過濾器將格式化參數(shù)，并且為jsonp請求增加callbacksjQuery.ajaxPrefilter("json jsonp", function(s, originalSettings, jqXHR) {    var callbackName,        overwritten,        responseContainer,        // 如果是表單提交，則需要檢查數(shù)據(jù)        jsonProp = s.jsonp !== false && (rjsonp.test(s.url) ?            "url" :            typeof s.data === "string"             && !(s.contentType || "").indexOf("application/x-www-form-urlencoded")             && rjsonp.test(s.data) && "data"        );    // Handle iff the expected data type is "jsonp" or we have a parameter to set    // 這個方法只處理jsonp，如果json的url或data有jsonp的特征，會被當(dāng)成jsonp處理    if (jsonProp || s.dataTypes[0] === "jsonp") {        // Get callback name, remembering preexisting value associated with it        // s.jsonpCallback時函數(shù)，則執(zhí)行函數(shù)用返回值做為回調(diào)函數(shù)名        callbackName = s.jsonpCallback = jQuery.isFunction(s.jsonpCallback) ?            s.jsonpCallback() :            s.jsonpCallback;        // Insert callback into url or form data        // 插入回調(diào)url或表單數(shù)據(jù)        // "test.php?symbol=IBM&callback=jQuery20309245402452070266_1402451299022"        if (jsonProp) {            s[jsonProp] = s[jsonProp].replace(rjsonp, "$1" + callbackName);        } else if (s.jsonp !== false) {            s.url += (ajax_rquery.test(s.url) ? "&" : "?") + s.jsonp + "=" + callbackName;        }        // Use data converter to retrieve json after script execution        s.converters["script json"] = function() {            if (!responseContainer) {                jQuery.error(callbackName + " was not called");            }            return responseContainer[0];        };        // force json dataType        // 強制跟換類型        s.dataTypes[0] = "json";        // Install callback        // 增加一個全局的臨時函數(shù)        overwritten = window[callbackName];        window[callbackName] = function() {            responseContainer = arguments;        };        // Clean-up function (fires after converters)        // 在代碼執(zhí)行完畢后清理這個全部函數(shù)        jqXHR.always(function() {            // Restore preexisting value            window[callbackName] = overwritten;            // Save back as free            if (s[callbackName]) {                // make sure that re-using the options doesn't screw things around                s.jsonpCallback = originalSettings.jsonpCallback;                // save the callback name for future use                oldCallbacks.push(callbackName);            }            // Call if it was a function and we have a response            if (responseContainer && jQuery.isFunction(overwritten)) {                overwritten(responseContainer[0]);            }            responseContainer = overwritten = undefined;        });        // Delegate to script        return "script";    }});

transport = inspectPrefiltersOrTransports(transports, s, options, jqXHR);

jQuery.ajaxTransport("script", function(s) {    // This transport only deals with cross domain requests    if (s.crossDomain) {        var script, callback;        return {            send: function(_, complete) {                script = jQuery("