Function inspect

2.0.3/Ajax.js:108–130

(dataType)

        seekingTransport = (structure === transports);

    function inspect(dataType) {
        var selected;
        inspected[dataType] = true;
        jQuery.each(structure[dataType] || [], function(_, prefilterOrFactory) {
            var dataTypeOrTransport = prefilterOrFactory(options, originalOptions, jqXHR);
            /**
             * 针对jonsp处理
             */
            if (typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[dataTypeOrTransport]) {
                //增加cache设置标记
                //不需要缓存
                //dataTypes: Array[2]
                // 0: "script"
                // 1: "json"
                options.dataTypes.unshift(dataTypeOrTransport);
                inspect(dataTypeOrTransport);
                return false;
            } else if (seekingTransport) {
                return !(selected = dataTypeOrTransport);
            }
        });
        return selected;
    }

    return inspect(options.dataTypes[0]) || !inspected["*"] && inspect("*");
}