Método que serializa os dados do formulário e retorna em um objeto, array ou string (key : value); IE7++ (Não testado em versões anteriores), jQuery 1.2 ++ (serializeArray)

example.js

$('#teste').on('submit', function(e){
    e.preventDefault();
    var x = 0

   //to string mode
   console.log($('#teste').serializeTo({returnType: ''}));

   //default
   console.log($('#teste').serializeTo()); 

   //callback function
   $('#teste').serializeTo({returnType: []}, function(x){
   	console.log(x);
})  

serializeTo.js

/**
 * Plugin serializeTo
 * return dataserialize object, array or string
 * @author Gustavo da Silva Rodrigues
 **/
;(function ( $, window, document, undefined ) {
    var pluginName = "serializeTo",

        /**
         * default Configuration
         * @param Object defaults
         **/
            defaults = {
            /**
             * Config
             * @param Object | Array | String returnType
             **/
            returnType: {} // {}, [], ''
        };
    function Plugin ( element, options) {
        //private
        this.element = element;
        this.settings = $.extend( {}, defaults, options );
        this.dataArray = $serilizeData = $(document).find(this.element).serializeArray();
        this._defaults = this.settings || defaults;
        this._name = pluginName;
        this.result = {};
        this.init();
        return this.result;
    }

    Plugin.prototype = {
        init: function () {
            var _this = this;
            switch (Object.prototype.toString.call( this._defaults.returnType )){
                case '[object object]' 	:
                    _this.result = {};
                    for(var data in this.dataArray){
                        var name = this.dataArray[data].name.replace('[]','');
                        if( typeof _this.result[name] != 'undefined' ){
                            if(Array.isArray(_this.result[name])){
                                _this.result[name].push(this.dataArray[data].value)

                            } else {
                                var temp = _this.result[name];
                                this.result[name] = [];
                                this.result[name].push(temp);
                                this.result[name].push(this.dataArray[data].value);
                            }
                        } else {
                            _this.result[name] = this.dataArray[data].value;
                        }
                    }
                    break;
                case '[object Array]' 	:
                    _this.result = [];
                    for(var data in this.dataArray){
                        var name = this.dataArray[data].name.replace('[]','');
                        if( typeof _this.result[name] != 'undefined' ){
                            if(Array.isArray(_this.result[name])){
                                _this.result[name].push(this.dataArray[data].value)

                            } else {
                                var temp = _this.result[name];
                                this.result[name] = [];
                                this.result[name].push(temp);
                                this.result[name].push(this.dataArray[data].value);
                            }
                        } else {
                            _this.result[name] = this.dataArray[data].value;
                        }
                    }
                    break;
                case '[object String]'	:
                    _this.result = '';
                    for(var data in this.dataArray){
                        _this.result += this.dataArray[data].name +' : '+ this.dataArray[data].value +'\n';
                    }
                    break;
                default:
                    _this.result = {};
                    for(var data in this.dataArray){
                        var name = this.dataArray[data].name.replace('[]','');
                        if( typeof _this.result[name] != 'undefined' ){
                            if(Array.isArray(_this.result[name])){
                                _this.result[name].push(this.dataArray[data].value)

                            } else {
                                var temp = _this.result[name];
                                this.result[name] = [];
                                this.result[name].push(temp);
                                this.result[name].push(this.dataArray[data].value);
                            }
                        } else {
                            _this.result[name] = this.dataArray[data].value;
                        }
                    }
                    break;
            }
            return _this.result;
        }
    };
    $.fn[ pluginName ] = function ( options, callback ) {

        if (typeof callback == 'function') {
            return callback($.data( this, "plugin_" + pluginName, new Plugin( this, options )));
        } else {
            return $.data( this, "plugin_" + pluginName, new Plugin( this, options ));
        }
    };

})( jQuery, window, document );

/**Compatibility
 * Running the following code before any other code will create Array.isArray() if it's not natively available.
 * Ref.: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
 **/

serializeTo.min.js

(function(e,t,n,r){function o(t,r){this.element=t;this.settings=e.extend({},s,r);this.dataArray=$serilizeData=e(n).find(this.element).serializeArray();this._defaults=this.settings||s;this._name=i;this.result={};this.init();return this.result}var i="serializeTo",s={returnType:{}};o.prototype={init:function(){var e=this;switch(Object.prototype.toString.call(this._defaults.returnType)){case"[object object]":e.result={};for(var t in this.dataArray){var n=this.dataArray[t].name.replace("[]","");if(typeof e.result[n]!="undefined"){if(Array.isArray(e.result[n])){e.result[n].push(this.dataArray[t].value)}else{var r=e.result[n];this.result[n]=[];this.result[n].push(r);this.result[n].push(this.dataArray[t].value)}}else{e.result[n]=this.dataArray[t].value}}break;case"[object Array]":e.result=[];for(var t in this.dataArray){var n=this.dataArray[t].name.replace("[]","");if(typeof e.result[n]!="undefined"){if(Array.isArray(e.result[n])){e.result[n].push(this.dataArray[t].value)}else{var r=e.result[n];this.result[n]=[];this.result[n].push(r);this.result[n].push(this.dataArray[t].value)}}else{e.result[n]=this.dataArray[t].value}}break;case"[object String]":e.result="";for(var t in this.dataArray){e.result+=this.dataArray[t].name+" : "+this.dataArray[t].value+"\n"}break;default:e.result={};for(var t in this.dataArray){var n=this.dataArray[t].name.replace("[]","");if(typeof e.result[n]!="undefined"){if(Array.isArray(e.result[n])){e.result[n].push(this.dataArray[t].value)}else{var r=e.result[n];this.result[n]=[];this.result[n].push(r);this.result[n].push(this.dataArray[t].value)}}else{e.result[n]=this.dataArray[t].value}}break}return e.result}};e.fn[i]=function(t,n){if(typeof n=="function"){return n(e.data(this,"plugin_"+i,new o(this,t)))}else{return e.data(this,"plugin_"+i,new o(this,t))}}})(jQuery,window,document)