Is it possible to use Extjs scripts in external html?

Question

I downloaded hand-written scripts in Extjs using: Ext.Loader.LoadScript

Ext.Loader.loadScript({ url : './a-path/testController.js', onLoad : onLoad('loaded'), onError : onError }); 

I also added an external html file using the panel:

 var myTestPanel = Ext.create('Ext.panel.Panel', { title : 'Example 1', width : 250, height : 250, frame : true, loader: { url: './test.html', renderer: 'html', autoLoad: true, scripts: true } }) 

Question: "How can I use downloaded scripts in my external html file?"