Fetch WordPress Media Files (Attachments) Via Backbone Model

fetch-attachment.js

var attachment_id = 1234;
var attachment = new wp.media.model.Attachment.get(attachment_id);
attachment.fetch({success:function(att){
	if (_.contains(['png','jpg','gif','jpeg'],att.get('subtype'))) {
		console.log(att.attributes);
    		$("<img/>").attr("src",att.attributes.sizes.thumbnail.url).appendTo($("body"));
	}
}});