a:hover {
text-decoration:underline;
}
<div>
<ul>
<li>
<a>
<span class="title1">
title1
</span>
title2 is hover underline
</a>
</li>
</ul>
</div>
如何刪除hover樣式只TITLE1。
title1沒有下劃線,標題加下劃線;
https://jsfiddle.net/17d80ym3/12/ – SMS