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JScript code:
//
function Rectangle(w,h){
this.width = w;
this.height = h;
}
//
Rectangle.prototype.area = function(){
return this.width*this.height;
}
//
function PositionedRectangle(x,y,w,h){
//
Rectangle.call(this,w,h);
this.x = x;
this.y = y;
}
//
PositionedRectangle.prototype = new Rectangle();
//
delete PositionedRectangle.prototype.width;
delete PositionedRectangle.prototype.height;
//
PositionedRectangle.prototype.constructor = PositionedRectangle;
//
PositionedRectangle.prototype.contains = function(x,y){
return (x > this.x && x < this.x + this.width && y > this.y && y < this.y + this.height);
}
//²âÊÔ
var r = new PositionedRectangle(2,2,2,2);
alert(r.area());


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