CSS选择器或是一组选择器去尝试。被发现的第一个选择器被返回。
The CSS selector or an array of selectors to try. The first selector that is found is returned.
然后,我们将设置第二个选择器,以执行序列号2和相应的组标识符。
We then set up a second selector that specifies a sequence number of 2 along with the group identifier.
参见事件选择器和事件组以了解更多信息。
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