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function Rectangle(w,h)
{
  this.width=w;
  this.height=h;
}
//¶¨ÒåÒ»¸ö·½·¨
function compute_area()
{
  return this.width*this.height;

}

var page=New Rectangle(8.5,11);
page.area=compute_area;

//µ÷ÓÃз½·¨
var a=page.area();


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