readAttribute by classname in Prototype javascript

I am having a HTML like

<a href="yourpath/controller/views/username" class="classname">username</a>

How to read the attribute href's value by classname using the Prototype.js.

Ple开发者_开发百科ase give some suggestions.

---

$$('.classname')[0].readAttribute('href');

Note that $$ will always return an array.

---

$$('.classname').pluck('href');

This will return an array of href values in case you need more than one.

---

$$('.className')[0].readAttribute('href')