UNITY Destroy()和DestroyImadiate()都不会立即释放对象内存

如题，destroyimadiate是立即将物体从场景hierachy中移除，并标记为 "null"，注意 是带引号的null。这是UNITY内部的一个处理技巧。关于这个技巧有很争议。

destroy要等到帧末才会将物体从场景层级中移除并标记为"null"。

1 using System.Collections;
 2 using System.Collections.Generic;
 3 using System.Diagnostics;
 4 using UnityEngine;
 5 using UnityEngine.UI;
 6 
 7 public class MyGo : MonoBehaviour
 8 {
 9     byte[] data = new byte[83000];
10 }
11 public class testad : MonoBehaviour {
12 
13     Transform objs;
14     Text txt;
15 
16     Process proc;
17     // Use this for initialization
18     void Start () {
19         var btnadd = transform.Find("btnAdd").GetComponent<Button>();
20         btnadd.onClick.AddListener(OnClckAdd);
21         var btndel = transform.Find("btnDel").GetComponent<Button>();
22         btndel.onClick.AddListener(OnClckDel);
23 
24         objs = transform.Find("objs");
25 
26         txt = transform.Find("Text").GetComponent<Text>();
27         proc = Process.GetCurrentProcess();
28     }
29 
30     void OnClckAdd()
31     {
32         for (int i = 0; i < 20; ++i)
33         {
34             var go = new GameObject();
35             go.AddComponent<MyGo>();
36             go.transform.SetParent(objs);
37         }
38     }
39 
40     void OnClckDel()
41     {
42         for (int i = objs.childCount - 1; i >= 0; i--)
43         {
44             GameObject.DestroyImmediate(objs.GetChild(i).gameObject);
45         }
46 
47         System.GC.Collect();
48     }
49     // Update is called once per frame
50 
51     float timer = 0;
52     void Update () {
53         if (timer > 0.5f)
54         {
55             timer = 0;
56             txt.text = ((int)(proc.WorkingSet64 / 1024)).ToString();
57         }
58         timer += Time.deltaTime;
59     }
60 }