unity3d鼠标滚轮实现摄像头拉近后退

using UnityEngine;using System.Collections;public class CubeStatic : MonoBehaviour{    public float minFov = 15f;    public float maxFov = 90f;    public float sensitivity = 10f;    void Update()    {      float fov = Camera.main.fieldOfView;      fov += Input.GetAxis("Mouse ScrollWheel") * sensitivity;      fov = Mathf.Clamp(fov, minFov, maxFov);      Camera.main.fieldOfView = fov;    }}