【Unity】UGUI如何判断鼠标或者手指是否点击到UI上

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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");
}
}
}
}