下面的三个样本之间有什么区别，哪一个更好（如果有的话）？
$("#x span").hide();
$("#x").find("span").hide();
$("span", "#x").hide();
他们都会匹配相同的东西；最好的是基于上下文的。我会使用第一个例子，除非我有一个指向现有集合的变量。然后我显然会在上面使用find（）方法。
旧的$（选择器，上下文）（您的第三个例子）现在不多见了，可能是因为它翻译成了$[上下文]。无论如何，在幕后查找（选择器）
这些都做出了相同的选择，但第一个比最后两个表现更差，后者表现大致相同，请参见：
http://jsperf.com/jquery-selector-perf-right-to-left/48
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