vault backup: 2022-06-14 15:53:24

Affected files:
.obsidian/workspace
02. PARA/03. Resources（資源）/Design Pattern.md
attachments/20220614154819_Observer_Pattern.png

.obsidian/workspace

@@ -9,7 +9,7 @@
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@@ -116,6 +116,7 @@
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@@ -124,7 +125,6 @@
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02. PARA/03. Resources（資源）/Design Pattern.md

@@ -131,3 +131,10 @@ class duckWood : public duck {
         ![[Pasted image 20220526183019.png]]
 
 這樣做的另一個好處是fly的初始化是動態的，只要再多一個`set()` function就可以動態的切換實作，也就是說你可以從設定檔來決定你的鴨子要長什麼樣子。
+
+
+## 觀察者模式（Observer Pattern ）
+有一個會產生變動的主角（subject），與一堆需要觀察變動的「觀察者」。觀察者向主角註冊，當主角發生變化的時候，發後通知給觀察者。
+![[20220614154819_Observer_Pattern.png]]
+
+其中