小编use*_*600的帖子

<ul>
   <li>Index 0</li>
   <li>Index 1</li>
   <li>Index 2</li>
</ul>
<div>
     <a>Index 0</a>
     <a>Index 1 (If i click this this this i want to addClass to it to LI with the same index of this )</a>
     <a>Index 2</a>
</div>

<ul>
  <li>Short</li>
   <li>Short</li>
   <li>Short
    <ul>
       <li>Short</li>
       <li>Longer</li>
       <li>This is the longest (how do i get this longest width as width of all LI siblings with in this UL only)</li>
   <ul>
   </li>
</ul>