这就可以在SubscriberHelper中定义选择器逻辑，允许客户端有选择性的接收通知消息。
This enables the selector logic defined in the SubscriberHelper to work and allows clients to selectively receive the notification messages.
获得集合中每个匹配元素的所有前面的兄弟元素，选择性筛选的选择器。
Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.
获得每个匹配元素集合中所有下面的同辈元素，选择性筛选的选择器。
Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.
获得匹配元素集合中每个元素的兄弟元素，选择性筛选的选择器。
Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.
获得匹配元素集合中每个元素的兄弟元素，选择性筛选的选择器。
Get all preceding siblings of each element in the set of matched elements, optionally filtered by a selector.
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