JavaScript中的private和public字词到底有多保留？

(function(window,undefined){
  var LibName = function(){
    var privateAPI = {
      method: function(){}
    };
    var publicAPI = {
      publicMethod: function(){}
    };
    return publicAPI;
  }
  window.LibName = LibName;
})();

(function(window,undefined){
  var LibName = function(){
    var private = {
      method: function(){}
    };
    var public = {
      publicMethod: function(){}
    };
    return public;
  }
  window.LibName = LibName;
})();

public

this[\"private\"] = {
  method: function() {}
}

namespace.decorator = function (pub, priv) {
  pub = pub || {};
  priv = priv || {};
  //namespace.decoratorToExtend(pub, priv);
  pub.method = function() {alert(pub.prop)};
  return pub;
}
var instance = namespace.decorator({prop:\'hello world\'});
instance.method();