【Unity】UGUI如何判断鼠标或者手指是否点击到UI上

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
public class UiClickTest : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

		if (Input.GetMouseButtonDown(0)) {
			if (EventSystem.current.IsPointerOverGameObject()) {
				Debug.Log("点击到UGUI的UI界面，会返回true");
			} else {
				Debug.Log("如果没点击到UGUI上的任何东西，就会返回false");
			}
		}
	}
}