Each region you want to be swappable must be marked as such with a class parameter.
必须通过class参数这样标记每个想要切换的区域。
As mentioned earlier, this only requires that the tag surrounding this section have a class parameter.
正如之前提到的，这只要求包围这个部分的标记具有class参数。
What if someone inadvertently passes in a null value for the Class parameter?
如果有人不经意地为Class参数传入一个null值会怎么样呢？
What if someone inadvertently passes in a null value for the Class parameter?
如果有人不经意地为Class参数传入一个null值会怎么样呢？
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