倒计时 功能

using UnityEngine;
using System.Collections;

public class daojishi : MonoBehaviour
{
    float CoolTimes = 10000;
    GUIText time;

    void Start()
    {
        time = GameObject.Find("Time").GetComponent<GUIText>

();
    }

    void OnGUI()
    {
        if (CoolTimes >= 3600)
        {
            time.text = (Mathf.Floor(CoolTimes / 3600) + ":" + 

Mathf.Floor((CoolTimes - 3600 * Mathf.Floor(CoolTimes / 3600)) 

/ 60) + ":" + CoolTimes % 60).ToString();
        }
        else
        {
            time.text = (Mathf.Floor(CoolTimes / 60) + ":" + 

CoolTimes % 60).ToString();
        }

        if (GUILayout.Button("Start"))
        {
            StartCoroutine(Wait());
        }

    }

    IEnumerator Wait()
    {
        while (CoolTimes > 0)
        {
            yield return new WaitForSeconds(1f);
            CoolTimes--;
        }

    }
}