How to extend existing constructor function in javascript? -

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Let's say I have the following object function: 
  function A (option) {html> 
 
 
 ..}   
 Then I want to create a new function (B) which is the owner of the prototype of A. These are the conditions I am looking for:  
     
  •  The prototype of B, if modified, do not call the A  
  •  as a constructor B function Should be A Constructor of A   
     B should look like this:  
     
     Function B (aOptions, bOptions) {...}   
      var b = new B ({}, {})    
     
     
     just  a  constructor to  this   
      function b (an option, bioption) {a.call (this, AOptions) Call up area. ; // do bops stuff here ...}   
     Now to set the prototype  
      B.prototype = Object.create (aprototype, { Manufacturer: {value: b}}); Now B will have prototype methods from A.  
     There will be some other changes in  
     
     prototype of A in any new way to be added to the prototype of B, which is your life Can also make it easy.  
      function A (option) {// make` new` optional if (! For example A)) {return new A (option); } // do stuff with options here ...}   
     and do this for b  
      function b (aOptions, bOptions) {// Make` new` optional if (! (B of this example)) Return (new B (option, bipation); } // Call parent constructor a. Cole (this, an option); // do stuff here with bOptions ...}   
     Now you can call  A  or  New A (Option) < / Code> to get the same results.  
     With B,  B (aOptions, bOptions)  or  New B (aOptions, bOptions)  will get the same result.

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