function Shape(iSides) {
this.sides = iSides;
}
Shape.prototype.getArea = function (ss) {
return 0;
};
function Triangle(iBase, iHeight) {
Shape.call(this, 3);
this.base = iBase;
this.height = iHeight;
}
Triangle.prototype = new Shape();
Triangle.prototype.getArea = function () {
return 0.5 * this.base * this.height;
};
function Rectangle(iLength, iWidth) {
Shape.call(this, 4);
this.length = iLength;
this.width = iWidth;
}
Rectangle.prototype = new Shape();
Rectangle.prototype.getArea = function () {
return this.length * this.width;
};
var triangle = new Triangle(12, 4);
var rectangle = new Rectangle(22, 10);
alert(triangle.sides); //outputs "3"
alert(triangle.getArea()); //outputs "24"
alert(rectangle.sides); //outputs "4"
alert(rectangle.getArea()); //outputs "220"