title: backbone.js how to use variables as selectors in events
body: <p>In Backbone.js I am trying to use a variable as a selector to bind to an event like this:</p>
  
  <pre><code>events: function() {
      var _events = {};
      _events["click " + "#plus-" + this.options.count] = "add";
      return _events;
  }
  </code></pre>
  
  <p>Some (or more than one) thing must be wrong because Backbone seems to ignore it.</p>
  
  <p>Most examples I've seen here use class and not id selectors. Is there a reason for that?</p>
  
  <p>Thanks in advance </p>