jQuery:找到以前的div

Question

<div class="a" style="display:none">Content 1</div>
<div class="a" style="display:none">Content 2</div>

some other HTML...

<span id="b">foobar</span>

如何匹配span id ="b"上方的第一个div class ="a"来显示()它？id ="b"是我之前唯一知道的事情.

Answer 1

像这样:

$('#b').prevAll('.a:first').show();