Unity 时间的具体使用

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {
public float time1;
public float time6;
public float time2;
public float time3;
public float time4;
public float time5;
public bool is_true=true ;
public bool is_false;
public GameObject cube;
GameObject _Instance;
// Use this for initialization
void Start () {
time3 = 0.25f;
time4 = 1.25f;
}

// Update is called once per frame

void Update () {

if (null == _Instance) {
_Instance = (GameObject)Instantiate (cube, gameObject.transform.position, Quaternion.identity);
}
time2 = Time.time;
time5 = Time.time;
if (!is_false) {
if (time6+time4<time5) {
time6=time5;
is_false=true ;
}
if (time1+time3<time2) {
time1=time2;
is_true=!is_true;
print("is_true="+is_true+"time"+time2);
}
}

}
}