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<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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