如果你在画布区域对节点进行变形的操作，那么在当前时间点会自动创建一个关键帧。
Keyframes are automatically added at the current time if you transform a node in the canvas area, given that the transformed property already has one or more keyframes in the timeline.
在当前节点的子节点列表的开始处创建一个新的子节点。
Creates a new child node at the beginning of the list of child nodes of the current node.
使用指定的XML数据字符串在当前节点的子节点列表的末尾创建一个新的子节点。
Creates a new child node at the end of the list of child nodes of the current node using the XML data string specified.
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