1# eTS Common Event 2 3 4 5### Introduction 6 7This sample shows how to use **CommonEvent** APIs in Extended TypeScript (eTS) to create subscribers and subscribe to, publish, and unsubscribe from common events. 8 9### Usage 10 111. On the home screen of the sample app, touch **Create subscriber** and **Subscribe**. The execution result is displayed in the lower text box. Touch **Publish common event** and **Publish specified common event**. The common event information received after the common event is successfully published is displayed in the lower text box. Touch **Unsubscribe** to unsubscribe from the common event. 12 13 14 15### Constraints 16 17This sample can only be run on standard-system devices. 18