Unity3D 编写游戏运行时间 格式为00:00:00

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;public class GameTime : MonoBehaviour {// Use this for initialization        private Text text;    private float timer = 0f;    private int h = 0;    private int m = 0;    private int s = 0;    private string timeStr = string.Empty;    void Start()    {        text = GetComponent<Text>();    }      // Update is called once per frame    void Update()    {        timer += Time.deltaTime;        if (timer >= 1f)        {            s++;            timer = 0;        }        if (s >= 60)        {            m++;            s = 0;        }        if (m >= 60)        {            h++;            m = 0;        }        if (h >= 99)        {            h = 0;        }                timeStr = string.Format("{0:D2}:{1:D2}:{2:D2}", h, m, s);        text.text = "" + timeStr;    }}