objectSample8.js

var obj = {
		mon : 0,
		tue	: 1,
		wed	: 2,
		thu	: undefined,
		time : {
			morning : "5-11",
			night	: "19-22"
		}
	}

	if (typeof Object.create !== 'function') {
		Object.create = function (o) {
			var F = function() {};
			F.prototype = o;
			return new F();
		};
	}

	var another_obj = Object.create(obj);

	// プロトタイプのプロパティを見に行く
	console.log(another_obj.time.morning);	//5-11

	// 同名のプロパティを設定
	another_obj.time.morning = "6-10";
	console.log(another_obj.time.morning); //6-10

	// 設定したプロパティを削除
	delete another_obj.time.morning;  
	console.log(another_obj.time.morning); // undefined !?