1.计秒器：
void Start(){StartCoroutine(MyCoroutine());}IEnumerator MyCoroutine(){int time = 0;while(true){print(time + "秒");time++;yield return new WaitForSeconds(1);}}结果：
2.生成多个cude （不卡顿）：
void Start(){StartCoroutine(MyCoroutine(100000));}IEnumerator MyCoroutine(int num){ for(int i = 0; i < num; i++){GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Cube);obj.transform.position = new Vector3(Random.Range(-100, 100), Random.Range(-100, 100), Random.Range(-100, 100));if(i % 100 == 0 && i != 0){yield return null;}}}
结果：
