How to make a button actually do something

@NApiVersion

I challenged one of my developers to do his next project in SS2.0.

He wants to put a button on a page (in this case Work Orders) and trigger a simple JavaScript action when somebody clicks on it.

He's using a User Event Script to place the button, like so:

 /**                                                                                 * @NApiVersion 2.x                                                                 * @NScriptType UserEventScript                                                     */                                                                                 define(['N/log'],                                                                         function(log) {                                                                                                                                     function beforeLoad(context) {                                                         var button = context.form.addButton({                                                id: "custpage_nb_test_button",                                                     label: "Test Button",                                                              functionName: "testFunctionOne"                                                  });                                                                                                                                                                   log.debug("button info", button);                                              }                                                                                  return {                                                                                beforeLoad: beforeLoad                                                              };                                                                                  });          

What we are confused by is that we don't know how to put a function called "testFunctionOne" into the Global namespace on the Work Order form.