[рони]

animatio,

function Rectangle(a,b){
 this.wideness=a;
 this.tallness=b;
 }

 Rectangle.prototype.perimetr=function(){
 return 2*(this.wideness+this.tallness);
 }
 var smallRectangle= new Rectangle(20,30);
 var val=smallRectangle.perimetr()
 alert(val);