现有一段
<div calss="m_list">
<ul>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
</ul>
</div>
<ul>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
<li>sdlkfj</.li>
</ul>
我希望能找出<div calss="m_list">下的所有<li>元素。谁能帮帮我啊,在此感谢