Yah, my fault. Indeed I didn't have my prototype.js. And after I make
sure I have my prototype.js, and run it again, I still didn't see
anything and got 1 error in Mozila, saying:
sound is not defined
How do I go about it now? Below are the whole code:
<script>
var Animal = Class.create();
Animal.prototype = {
initialize: function(name, sound) {
this.name = name;
this.sound = sound;
},
speak: function() {
alert(name + " says: " + sound + "!");
}
};
var snake = new Animal("Ringneck", "hissssssssss");
snake.speak();
// -> alerts "Ringneck says: hissssssssss!"
var Dog = Class.create();
Dog.prototype = Object.extend(new Animal(), {
initialize: function(name) {
this.name = name;
this.sound = "woof";
}
});
var fido = new Dog("Fido");
fido.speak();
// -> alerts "Fido says: woof!"
</script>
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