coffee.coffee

class @A
   my_function: => alert 'my function!'

   A_Function_Alias: @::my_function

   usage_of_alias: =>
      @A_Function_Alias()
      # some other code...

js.js

var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

this.A = (function() {

  function A() {
    this.usage_of_alias = __bind(this.usage_of_alias, this);
    this.my_function = __bind(this.my_function, this);
  }

  A.prototype.my_function = function() {
    return alert('my function!');
  };

  A.prototype.A_Function_Alias = A.prototype.my_function;

  A.prototype.usage_of_alias = function() {
    return this.A_Function_Alias();
  };

  return A;

})();