<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script>
function EventObject() {
var eventRepository = {};
this.attach = function (eventName, handler) {
eventRepository[eventName] = eventRepository[eventName] || [];
eventRepository[eventName].push(handler);
}
this.fire = function (eventName) {
var handlers = eventRepository[eventName];
if (handlers) {
for (var i = 0; i < handlers.length; i++) {
handlers[i]();
}
}
}
}
function PersonClass(name, age) {
EventObject.call(this);
this.name = name;
this.age = age;
this.getName = function () {
return this.name;
}
}
PersonClass.prototype.introduce = function () {
console.info("I'm " + this.name + ", " + this.age + " years old");
}
function EmployeeClass(name, age, emNO, title) {
PersonClass.call(this, name, age);
this.emNo = emNO;
this.title = title;
}
EmployeeClass.prototype = new PersonClass();
EmployeeClass.prototype.finishAJob = function () {
console.log("I am promoted, I will be given a more important job or rank in the organization that I work for");
this.fire("promote");
}
var emp1 = new EmployeeClass("wj", 18, "2705", "senior");
var emp2 = new EmployeeClass("wsc", 28, "9705", "senior");
emp1.introduce();
emp2.introduce();
emp2.attach("promote", function () {
alert("treat my friends!");
});
emp2.finishAJob();
</script>
</head>
<body>
</body>
</html>
