gistfile1.js

AUI().use('aui-node', 'aui-io-request', function(A) {
  
  A.one('#myButton').on('click', function() {
    loadAnotherContent();
  });
  
  function loadAnotherContent() {
    
    A.io.request('http://alloyui.com/io/data/content.html', {
  
      on: {
        success: function() {
          var data = this.get('responseData');
          A.one('#ajaxContainer').html(data); // This will evaluate data HTML, script, CSS, ...
        }
      }
      
    }

  });

});