How to convert li texts to links in javascript, randomly?

I need to convert a list of li texts to links using javascript, 3 links randomly.

FROM THIS:
<ul>
<li> list 1</li>
<li> list 2</li>
<li> list 3</li>
<li> list 4</li>
<li> list ..</li>
<li> list 80 </li>
<li> list 82 </li>
<li> list 100</li>
</li>

TO THIS:
<div class="mytd">
<ul>
<li> list 1</li>
<li> <a href="/folder/"> list 2 </a> list 2</a></li>
<li> list 3</li>
<li> list 4</li>
<li> list ..</li>
<li> <a href="/folder/"> list 80 </a> list 80</a></li>
<li> <a href="/folder/"> list 82 </a>...

How to convert li texts to links in javascript, randomly?

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