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> […]

See original post by invalid@example.com (ipunkbali)