jquery常用选择器总结详解编程语言

除了上面的选择器，我们还要了解一点点筛选的方法：

Get the descendants(子节点) of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.

$(li.item-ii).find(li).css(background-color, red);

Reduce(减少) the set of matched elements to those that match the selector or pass the function’s test.

$(li).filter(:even).css(background-color, red);

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