using System.Collections;
using System.Collections.Generic;
using System.Timers;
using UnityEngine;
using System.Diagnostics;
public class testdestroy : MonoBehaviour {GameObject cubeGo;Transform rootTrans;// Use this for initialization
Stopwatch timer;void Start () {cubeGo = GameObject.Find("Cube");rootTrans = GameObject.Find("root").transform;timer = new Stopwatch();}// Update is called once per framevoid Update () {if (Input.GetKey(KeyCode.LeftControl)){var go = Instantiate(cubeGo);go.transform.SetParent(rootTrans);}else if (Input.GetKey(KeyCode.A)){//11111111111for (int i = 0; i < rootTrans.GetChildCount(); ++i){timer.Reset();timer.Start();Destroy(rootTrans.GetChild(i).gameObject);timer.Stop();UnityEngine.Debug.Log("1:time elipsed===:" + timer.Elapsed);}rootTrans.DetachChildren();}else if (Input.GetKey(KeyCode.D)){//2222222222while (true){var cc = rootTrans.childCount;//UnityEngine.Debug.Log("cc============================" + cc);if (cc == 0)break;timer.Reset();timer.Start();DestroyImmediate(rootTrans.GetChild(0).gameObject);timer.Stop();UnityEngine.Debug.Log("2:time elipsed===:" + timer.Elapsed);}}else if (Input.GetKey(KeyCode.F)){DestroyImmediate(cubeGo.transform);}}
}

    void Start () {var root = gameObject.transform;for (var i = 0; i < root.childCount; ++i){//方式一，正确删除所有子结点var c = root.GetChild(i).gameObject;GameObject.Destroy(c);}for (var i = 0; i < root.childCount; ++i){//方式二，删不干净，会有一些剩余节点var c = root.GetChild(0).gameObject;GameObject.DestroyImmediate(c);}for (var i = 0; i < root.childCount; ++i){//方式三，删不干净，会有一些剩余节点,只删除了偶数节点0,2,4,6，剩余奇数节点1,3,5,7var c = root.GetChild(i).gameObject;GameObject.DestroyImmediate(c);}while (root.childCount > 0){//方式四，正确删除所有子结点var c = root.GetChild(0).gameObject;GameObject.DestroyImmediate(c);}

　　　　　　for (int i = go.childCount - 1; i >= 0; i--) {//方式五，正确删除所有子结点
　　　　　　　　GameObject.DestroyImmediate(go.GetChild (i).gameObject);
　　　　　 }

}