Append content to the inside of every matched element.
向每个匹配的元素内部追加内容。
In the XPath example, the last function returns the index of the last matched element, which you use in square brackets.
在XPath例子中，last函数返回最后匹配元素的索引(用在方括号中)。
Both XPath and jQuery support straightforward traversal semantics for matching element nodes in relation to the currently matched element.
对于匹配与当前匹配的元素相关的元素节点，XPath和jQuery都支持直观的遍历语义。
应用推荐