Unity项目中显示项目的FPS

using UnityEngine;
using System.Collections;

public class ShowFpsOnGUI : MonoBehaviour
{

    public float fpsMeasuringDelta = 2.0f;
    public int TargetFrame = ;

    private float timePassed;
    private int m_FrameCount = ;
    private float m_FPS = 0.0f;

    private void Start()
    {
        timePassed = 0.0f;
        Application.targetFrameRate = TargetFrame;
    }

    private void Update()
    {
        m_FrameCount = m_FrameCount + ;
        timePassed = timePassed + Time.deltaTime;

        if (timePassed > fpsMeasuringDelta)
        {
            m_FPS = m_FrameCount / timePassed;

            timePassed = 0.0f;
            m_FrameCount = ;
        }
    }

    private void OnGUI()
    {
        GUIStyle bb = new GUIStyle();
        bb.normal.background = null;
        bb.normal.textColor = new Color(1.0f, 0.5f, 0.0f);
        bb.fontSize = ;

        //居中显示FPS
        GUI.Label(new Rect(, , , ), "FPS: " + m_FPS, bb);
    }
}