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doc/demo03_lifecycle/lifecycle.md

@@ -104,3 +104,40 @@ var subNode4 = get_tree().root.find_node("SubNode2", true, false)
 ![Image text](image/physics.png)
 ![Image text](image/physics-1.png)
 
+# 6. Parent和Owner
+
+- Parent
+    - 一个节点的Parent就是场景树上它的父级
+
+- Owner
+    - 如果不修改默认Owner的话，可以把它视为节点所在场景的顶部节点，如果该节点本身就是顶部节点那么它的Owner为null
+
+
+- 静态场景结构中默认的Owner
+
+![Image text](image/owner01.png)
+
+```
+extends Node
+
+class_name TestNode
+
+func _ready():
+	var parent_name = "NULL"
+	var owner_name = "NULL"
+	if get_parent() != null:
+		parent_name = get_parent().name
+	if owner != null:
+		owner_name = owner.name
+	print(name + "'s parent is <" + parent_name + "> and it's owner is <" + owner_name + ">" )
+	
+```
+
+```
+node_3's parent is <node_2> and it's owner is <node_0>
+node_2's parent is <node_1> and it's owner is <node_0>
+node_1's parent is <node_0> and it's owner is <node_0>
+node_0's parent is <root> and it's owner is <NULL>
+```
+
+- 动态创建的节点的Owner是null

doc/demo04_signal/signal.md

@@ -53,8 +53,28 @@ disconnect("mySignal", 1, 2)
 # 3. 异步回调yield
 
 - yield, to produce a result, answer, or piece of information，立即结束当前函数调用，无需等待
+
+```
+其本质，就是能让一个函数在执行过程中暂停（挂起），然后在接收到恢复指令以后继续执行的机制。
+```
+
 - yield(obj, signal)，函数立即返回，并且保存当前执行的位置和状态
+
+```
+GDScriptFunctionState yield( Object object=null, String signal="" )
+```
+
 - yield返回GDScriptFunctionState类型对象，类似于Java的CompleteFuture
+
+```
+GDScriptFunctionState 是记录一个协程状态的对象，实际上它就代表(引用)着该协程。
+```
+
 - resume恢复GDScriptFunctionState保存的调用函数状态
 
-![Image text](image/yield.JPG)
+![Image text](image/yield.JPG)
+
+- yield的三种用法
+1. yield()和resmue()组合，yield()来挂起，用resmue()来恢复
+2. yield(节点对象N,信号S)的形式，把这个协程（即 GDScriptFunctionState）注册为 节点N上信号S的接收者，当 节点N发出信号S以后，函数会恢复执行。
+3. yield(协程对象C,"completed")的形式，协程失效（即GDScriptFunctionState的is_valid为false）以后，它会释放一个"completed"信号，用这个信号恢复上一层协程。