ClassLib

classlib.js

var Class = function(parent) {
  var klass = function() {
    this.init.apply(this, arguments);
  }
  if (parent) {
    var subclass = function() {};
    subclass.prototype = parent.prototype;
    klass.prototype = new subclass;
  }
  klass.prototype.init = function(){}
  klass.addInstanceFunc = function(name, func) {
    eval("this.prototype." + name + " = " + func);
  }
  klass.addClassFunc = function(name, func) {
    eval("this." + name + " = " + func);
  }
  klass.addSubclass = function(su) {
    eval("this." + su + " = " + su)
  }
  return klass;
}

Use

>>> User = new Class();
>>> User.addInstanceFunc("isUser", function(){console.log("Yeppers!")})
>>> userOne = new User();
>>> userOne.isUser();
Yeppers!
>>> User.addClassFunc("allUsers", function(){console.log("Just that guy...")})
>>> User.allUsers();
Just that guy...
>>> Parent = new Class();
>>> Parent.addInstanceFunc("noActualUse",function(){console.log("This has no use!")});
>>> Child = new Class(Parent);
>>> joey = new Child();
>>> joey.noActualUse();
This has no use!