摘要: jQuery expressions are a combination of [wiki:Base/Expression/CSS CSS] 1-3, [wiki:Base/Expression/XPath XPath], plus some custom code to glue it together. Essentially, the best parts from both of these query languages were taken, combined, and used to create the final jQuery expression language. If you already know [wiki:Base/Expression/CSS CSS] (which most web developers do) then you're going to be fine.
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