there have a freelance project where a one-page site makes sense,

The Markup

there with an unordered list for the navigation and a bunch of sections:

<ul id="nav">
  <li class="current"><a href="#section-1">Section 1</a></li>
  <li><a href="#section-2">Section 2</a></li>
  <li"><a href="#section-3">Section 3</a></li>
</ul>

<div id="section-1">
  <strong>Section 1</strong>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor
  incididunt ut labore et dolore magna aliqua.</p>
</div>
<div id="section-2">
  <strong>Section 2</strong>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor 
  incididunt ut labore et dolore magna aliqua.</p>
</div>
<div id="section-3">
  <strong>Section 3</strong>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor 
  incididunt ut labore et dolore magna aliqua.</p>
</div>

The JavaScript

Then,add jQuery, the ScrollTo plugin, and my plugin to the page:

<script src="jquery.js"></script>
<script src="jquery.scrollTo.js"></script>
<script src="jquery.nav.min.js"></script>

Finally,  just need to call  plugin on the navigation:

$(document).ready(function() {$('#nav').onePageNav();});

The article source:http://trevordavis.net/blog/jquery-one-page-navigation-plugin/