Backbone.js::Routes:: Passing arguments to routes

HTML

<script src="http://underscorejs.org/underscore.js"></script>
<script src="http://backbonejs.org/backbone.js"></script>
<!-- B A C K B O N E . J S
passing argumments to routes
 -->

<a href="#/a/abc">action = abc</a>
<a href="#/a/bcd">action = bcd</a>

JavaScript

var Router = Backbone.Router.extend({
    "routes": {
        'a/:a':'helloworld'
    },
    helloworld:function( action ){
       alert(action);   
        
    }
});

var router = new Router();
 Backbone.history.start();