best strong ext logs pan code b- query
<ul id="aaa"> <li>aaa</li> <li>aaa <ul> <li>bbb</li> <li>bbb</li> </ul> </li> <li>aaa</li></ul>
$('#aaa > li')就只会取到第一层的li,内层的li就不会取到
jquery 获取第一层 li
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