var $class = (function(){       

        var guid = 0,

        classMap  = {},

        caller    = null,

        callStack = [];

       

        return {

                create : createClass

        }

       

        //------------------------[辅助函数部分]------------------------

   

    /**

    * 创建新类.

    * @param  {constructor}superClass   超类构造器，该类必须由$class.create创建

    * @param  {Json}proto               类原型

    * @return {constructor}

    */

        function createClass(superClass, proto){

        var isSuperValid =  superClass instanceof Function

                         && superClass.prototype

                         && superClass.prototype.init instanceof Function;            

        

        superClass = isSuperValid ? superClass : null;

                  

                var superProto = superClass ? superClass.prototype : null;

                        

                //定义类构造函数

                var klass = function() {

                        var args = [].slice.call(arguments);

                       

                        //执行父类构造函数.

                        if(superClass){                             &nb