假设我需要在一个赋值给变量foo的元素中查找所有class为.bar的元素。
在jQuery中，foo.find( .bar )解决了这个问题。
mooTools 的等效功能是什么？
<div id="container">
<span class="elems">...</span>
<span class="elems">...</span>
...
</div>
----
var elems = $( container ).getElements( .elems );
// elems is now an array containing all spans with the class elem
或者：
var elems = $$( #container.elems );
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