用unity写一个射击游戏鼠标左键点按准星放大，连按准星放大缩小，松开回到原来大小的代码

我可以为你提供一段示例代码：using UnityEngine;public class ShootingGame : MonoBehaviour {// Use this for initializationvoid Start () {// Update is called once per framevoid Update () {if (Input.GetMouseButtonDown (0)) {transform.localScale *= 2;if (Input.GetMouseButton (0)) {transform.localScale *= 0.5f;if (Input.GetMouseButtonUp (0)) {transform.localScale = Vector3.one;}}}}