JS多重継承実現

    Class = function(){
	    var classPrototype = arguments[arguments.length - 1] || "";
		for(var i = 0; i < arguments.length - 1 ; i++){
			var superClass = arguments[i];
			if(typeof superClass === "function"){
				superClass = superClass.prototype;
			}
			if(!classPrototype.superClass){
				classPrototype.superClass = {};
			}
			for(var m in superClass){
				if(superClass.hasOwnProperty(m)){
					classPrototype.superClass[m] = superClass[m];
				}else{
					classPrototype[m] = superClass[m];
				}
			}
		}
		var currentClass = function(){
			if(this.initialize){
				this.initialize.call(this , arguments);
			}
		};
		currentClass.prototype = classPrototype;
        return currentClass;
	};

    var A = Class({
		width : "A width",
		getWidth : function(){
			return "A getWidth";
		}
	});
	var B = Class(A,{
		height : "B height",
		getHeight : function(){
			return "B getWidth";
		},
		width : 'B width'
	});

	var C = Class(A, B , {
		width: 'C width',
		size : 'C size',
		getHeight : function(){
			return "C getHeight";
		}
	});

	var b = new B();


	//alert(b.width);
	//alert(b.height);
	//alert(b.superClass.getWidth());

	var c = new C();
	alert(c.superClass.width);
	alert(c.size);
	alert(c.superClass.getHeight());