如何在Unity中显示FPS

using UnityEngine;

using System.Collections;

public class example : MonoBehaviour

{

    public float updateInterval = 0.5F;

    private double lastInterval;

    private int frames = ;

    private float fps;

    void Start()

    {

        lastInterval = Time.realtimeSinceStartup;

        frames = ;

    }

    void OnGUI()

    {

        GUILayout.Label(" " + fps.ToString("f2"));

    }

    void Update()

    {

        ++frames;

        float timeNow = Time.realtimeSinceStartup;

        if (timeNow > lastInterval + updateInterval)

        {

            fps = (float)(frames / (timeNow - lastInterval));

            frames = ;

            lastInterval = timeNow;

        }

    }

}