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1>zInherit£º
      ËüÊÇÒ»¸ö×é¼þ£¬ÓÃÀ´¼Ì³Ð»ùÀàµÄËùÓÐÊôÐԺͷ½·¨¡£¸úÒÔǰ˵µ½µÄÔ­ÐÍÁ´Ä£Ê½·Ç³£ÀàËÆ£¬Ö»²»¹ý±ÈÔ­Ð͸ü°²È«£¬Ò²ÎÞÐ뿼ÂDzÎÊýÎÊÌâ¡£ÏÂÃæ¿´¿´zInheritµÄÓ÷¨£º
      ¸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
    Note:ÔÚÖ´ÐÐǰ±ØÐë¼ÓÔØzInherit.js
2>xbObjects.js
    ËüÊÇÒ»¸ö¹¦ÄܸüÇ¿´óµÄ¼Ì³Ð»úÖÆ£¬³ýÁË¿ÉÒԼ̳лùÀàµÄÊôÐԺͷ½·¨Í⣬»¹¿ÉÒÔµ÷Óø¸ÀàµÄ·½·¨£¬ÔÚÖ´ÐÐǰҳ±ØÐëÔö¼Ó×é¼þxbObject.js.
 ¾ßÌåµÄ²½ÖèÈçÏ£º
   µÚÒ»²½£º×¢²áÀࣨ_classes.registerClass("sub_class","base_class") _classes.register("sub_class")£©
   µÚ¶þ²½£º¹¹Ô캯Êý£¬²¢ÔÚº¯ÊýÖж¨ÒåÀà(_classes.defineClass("class_name",prototypeFunction))
   µÚÈý²½£ºÖ´ÐÐinit£¨£©·½·¨£¬¸Ã·½·¨µÄ²ÎÊý±ØÐë¸ú¹¹Ô캯ÊýµÄ²ÎÊýÆ¥Åä
   µÚËIJ½£º¿ÉÒÔͨ¹ýparentMehtod("method_name",arguments)
   <mce:script type="text/javascript"><!--
//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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