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<html xmlns="http://www.w3.org/1999/xhtml"> <head>
<meta content="text/html; charset=gb2312" http-equiv="Content-Type" />
<title>¼Ì³Ð»úÖÆµÄʵÏÖ--ʵÀý</title>
<script type="text/javascript">
function Polygon(iSides){
this.sides=iSides;
}
Polygon.prototype.getArea=function(){
return 0;
};
function Triangle(iBase,iHeight){
Polygon.call(this,3);
this.base=iBase;//ÉèÖûù±¾µÄ±ßÊý
this.height=iHeight;
}
Triangle.prototype=new Polygon();
Triangle.prototype.getArea=function(){
return 0.5*this.base*this.height;
};
function Rectangle(iWidth,iHeight){
Polygon.call(this,4);
this.width=iWidth;
this.height=iHeight;
}
Rectangle.prototype=new Polygon();
Rectangle.prototype.getArea=function(){
return this.width*this.height;
};
var triangle=new Triangle(12,4);
var rectangle=new Rectangle(22,10);
alert("Èý½ÇÐεıß
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