'Button' does not contain a definition for 'onClick' and no accessible extension method 'onClick' accepting a first argument of type 'Button' could be found (are you missing a using directive or an assembly reference?)
一个非常奇葩的问题;突然!!!!!
using UnityEngine.UI;引用不了,灰色提示!
然后 Button类不管怎么都不能从UnityEngine.UI中引用,气炸!!!
人家的Button类都是继承自UnityEngine.UI