图示：
HTML：
title="hello sunfishlu, How are you?."
href="http://en.wikipedia.org/wiki/James_T._Kirk">sunfishlu</a>
(2233 - 2293/2371), played by William Shatner, is the leading character in the
original Star Trek TV series and the films based on it. Captain Kirk commanded
the starship <span class="ship">Enterprise</span>
(<a class="federation"
title="Read more about the USS Enterprise (NCC-1701) at Wikipedia, the free encyclopedia."
href="http://en.wikipedia.org/wiki/USS_Enterprise_%28NCC-1701%29">NCC-1701</a>
and later
<a class="federation"
title="Read more about the USS Enterprise (NCC-1701-A) at Wikipedia, the free encyclopedia."
href="http://en.wikipedia.org/wiki/USS_Enterprise_%28NCC-1701-A%29">NCC-1701-A</a>).</p>
每个<a></a>都含有title属性，当鼠标处于<a>上时，我们就会触发事件，产生tooltips。
JavaScript：