oop - Javascript methods use -

I am trying to create a square in JavaScript that will be inherited and overridden in some ways.

I am using the following structure:

  function myClass () {this.myvar = null; This.someotherVar = {someFunction: function (A, B) {function1 (A, B); }}} // Some functions MyClass.prototype.functionA = function {}} MyClass.prototype.functionB = function () {functionC ();} // Some functions that will be overrided by MyClass.prototype.function1 = function ( ) {...} MyClass.prototype.functionC = function () {...}   
 Now I have 2 problems:  
 
 
 functionC  in  functionB  because it is defined later?   
 
 How do I  function 1  inside  some functions  correctly?     
 
 
 
 1 in  functionC  Can there be a problem using  functionB  because it is defined later?   
 No you have to call it properly:  
  function () {this.functionC (); } // ^^^^^   
 otherwise the function will not be found.  
 Of course you also need to make sure that  functionB  is defined only once  functionC .  
 
 2. How can I relate to  function1  inside  some functions  correctly?   
 A small problem is that there is no method of  someFunction  example, but for some other object To call still the correct  function1 , you can store a reference in a variant for example:  
  function myClass () {var self = this ; This.myvar = null; This.someotherVar = {someFunction: function (A, B) {self.function1 (a, b); }}; }