Get a set of elements containing the unique parents of the matched set of elements.
取得一个包含着所有匹配元素的唯一父元素的元素集合。
Get a set of elements containing the unique next siblings of each of the matched set of elements.
取得一个包含着所有匹配元素的唯一父元素的元素集合。
Use an optional expression to filter the matched set. Only the immediately previous sibling is returned, not all previous siblings.
可以用一个可选的表达式进行筛选。只有紧邻的同辈元素会被匹配到,而不是前面所有的同辈元素。
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