Rails 3 - 建立一个表，想要每行交替颜色

Desired Output:

期望的输出：

<ul>
 <li class="odd">stuff</li>
 <li class="even">stuff</li>
 <li class="odd">stuff</li>
 <li class="even">stuff</li>
 <li class="odd">stuff</li>
 <li class="even">stuff</li>
 <li class="odd">stuff</li>
 <li class="even">stuff</li>
</ul>
<ul>
 <li class="odd