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U3D游戏中，可能会用到点击对象，完成某项操作，
方法一：可以通过接收Input对象的输入，进行利用
方法二：给对象绑定一个collier 组件，然后就能后使用内置方法
void OnMouseDown() { print("鼠标按下了"); }
只要给精灵绑定这个组件，那么鼠标的一系列的操作就都可以完成
OnMouseDown OnMouseDown is called when the user has pressed the mouse button while over the GUIElement or Collider. OnMouseDrag OnMouseDrag is called when the user has clicked on a GUIElement or Collider and is still holding down the mouse. OnMouseEnter Called when the mouse enters the GUIElement or Collider. OnMouseExit Called when the mouse is not any longer over the GUIElement or Collider. OnMouseOver Called every frame while the mouse is over the GUIElement or Collider. OnMouseUp OnMouseUp is called when the user has released the mouse button. OnMouseUpAsButton
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原文地址：http://www.cnblogs.com/sunxun/p/5080498.html
