Seite 7: Listing 7 - 11

Inhaltsverzeichnis

Listing 7: Überschreiben mit Merker-Variable

// Definition von "Person" wie in Listing 6
function Employee(firstName, lastName, department) {
  Person.call(this, firstName, lastName)
  var superGetName = this.getName;
  this.getName = function() {
    return superGetName.call(this) + " (" + department + ")";
  };
}
var Temp = function() {};
Temp.prototype = Person.prototype;
Employee.prototype = new Temp();

Listing 8: Private Methoden und die self-Variable

function Person(firstName, lastName) {
  var self = this;
  self.getName = function() {
    return firstName + " " + lastName;
  };
  var alertName = function() {
    alert(self.getName());
  };
  self.showDebugInfo = function() {
    alertName();
  };
}

Listing 9: Protected

function Person(firstName, lastName) {
  var prot = {};
  var self = this;
  prot.aProtectedMethod = function() {
    alert("Protected method");
  };
  if (self._protCounter > 0) {
    return prot;
  }
}
function Employee(firstName, lastName, department) {
  var self = this;
  self._protCounter = (self._protCounter ? self._protCounter + 1 : 1);
  var prot = Person.call(this, firstName, lastName);
  self._protCounter--;
  self.getName = function() {
    prot.aProtectedMethod();
    return firstName + " " + lastName;
  };
  if (self._protCounter > 0) {
    return prot;
  }
}
var Temp = function() {};
Temp.prototype = Person.prototype;
Employee.prototype = new Temp();

Listing 10: Namensräume/Pakete

if (!window.de) window.de = {};
if (!de.heise) de.heise = {};
if (!de.heise.ix) de.heise.ix = {};
if (!de.heise.ix.test) de.heise.ix.test = {};
de.heise.ix.test.Person = function(firstName, lastName) {
  // Implementierung siehe vorheriges Listing
}
de.heise.ix.test.Employee = function (firstName, lastName, department) {
  // Implementierung siehe vorheriges Listing
}
var Temp = function() {};
Temp.prototype = de.heise.ix.test.Person.prototype;
de.heise.ix.test.Employee.prototype = new Temp();
var max  = new de.heise.ix.test.Employee("Max", "Muster", "Sales");

Listing 11: Dokumentations-Kommentar

/**
 * Constructor for a Person object.
 * @param {String} firstName the person's first name.
 * @param {String} lastName the persons's last name.
 */
de.heise.ix.test.Person = function(firstName, lastName) {
  // ...
}