secondlevel
单击顶层链接后,如何使用 jQuery 隐藏/显示(切换)所有带有类的元素?
<ul>
<li><a class="toplevel" href="#">Hardware</a>
<ul>
<li><a class="secondlevel" href="#">Bottling</a></li>
<li><a class="secondlevel" href="#">Brewing</a></li>
<li><a class="secondlevel" href="#">Cleaning</a></li>
<li><a class="secondlevel" href="#">Fermenting</a></li>
<li><a class="secondlevel" href="#">Kegging</a></li>
<li><a class="secondlevel" href="#">Measuring</a></li>
<li><a class="secondlevel" href="#">Testing</a></li>
</ul>
</li>