gistfile1.js

        <script type="text/javascript">
            dojo.require("dojo.data.ItemFileWriteStore");
            
            var fillStore = function(){
             dojo.xhrGet({
                 url: "some/url",
                 handleAs: "json",
                 load: function(data, ioArgs){
                     // handle your data here
                 }
             });
            }
            
            dojo.addOnLoad(fillStore);
        </script>