判断鼠标是否在GUI上面

using UnityEngine;
using System.Collections;

public class NotOnGUI : MonoBehaviour
{
    public bool BeNotOnGUI;
    // Use this for initialization
    void Start ()
    {

    }

    // Update is called once per frame
    void Update ()
    {

    }

    void OnGUI()
    {
        if (Event.current.type == EventType.MouseDown)
        {
            BeNotOnGUI=true;
        }
        else if (Event.current.type == EventType.MouseUp)
        {
            BeNotOnGUI=false;
        }
    }
}