User data, which was set when authoring from Web Author, can be sent in key: value format to an object from the state event.

User data can also be obtained by using USERDATA in getProperty. Refer to the following for details. ▶ $wp.content

  <html>
  <head>
    <script src="wplayer-api.1.0.0.js"></script>        
    <script>
    const contentPropertyType = $wp.content.getPropertyType();
    $wp.setDefaultCallback(function(object) {
      switch (object.type) {
        case 'state':
          switch (object.sub) {
            case 'ready':
            $wp.content.getPage(object.pageId).getElement('Text1').setProperty(contentPropertyType.TEXT, `${JSON.stringify(object.data)} from User Data`);
            break;
            default:
            break;
          }
          break;
        default:
          break;
      }
    });
    </script>
  </head>    
  </html>