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¸Ã×é¼þÖÐÖ»ÓÐÁ½¸ö·½·¨£ºinheritfrom() instanceof()
function Polygon(iSides){
this.iSides = iSides;
if(typeof Polygon._initialized == "undefined"){
Polygon.prototype.getArea = function(){
return 0;
}
Polygon._initialized = true;
}
}
function Traingle(iHeight,iWidth){
Polygon.call(this,3);
this.iHeight = iHeight;
this.iWidth = iWidth;
if(typeof Traingle._initialized == "undefined"){
Traingle.inheritfrom(Polygon);
//ÉÏÐеÄЧ¹û¸úÔÀ´µÄÕâ¸ö·Ç³£ÀàËÆ
// Traingle.prototype = new Polygon();
Traingle.prototype.getArea = function(){
return 0.5*iHeight*iWidth;
}
Traingle._initialized = true;
}
}
var traingle = new Traingle(12,4);
alert(traingle.getArea());//24
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//Polygon
_classes.registerClass("Polygon"); //1
function Polygon(iSides){ //2
_classes.defineClass("Polygon",prototypeFunction);
this.init(iSides);//³õʼ»¯PolygonµÄËùÓÐÊôÐÔ//3
function prototypeFunction(){//4
Polygon.prototype.init = function(iSides){
this.parentMethod("init");
this.iSides
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