deep-clone 深层克隆
If a deep clone is not returned, the run-time behavior is undefined.
如果未返回深层克隆,则运行时行为将不可确定。
This method returns a copy that is a deep clone of your binding context.
此方法返回作为绑定上下文的深层克隆的副本。
This creates a complete copy of the current binding element object tree, also called a deep clone.
这将创建当前绑定元素对象树的完整副本,也称为深层克隆。
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