小写的object是泛类, 引用的是System.Object.
大写的Object引用的是UnityEngine.Object.
UnityEngine.Object继承System.Object.
需要注意的是重载的运算符.
System.Object a = new System.Object();
UnityEngine.Object b = new UnityEngine.Object();
Debug.Log (a); //System.Object
Debug.Log (b); //null
unity中 Object 与 object的区别.,布布扣,bubuko.com
原文：http://www.cnblogs.com/reuyui/p/3919929.html