Function on

on(eventName, listener, context?): EventEmitter
Add a listener for a given event.
Parameters
- eventName: string | symbol
  The event name.
- listener: Function
  The listener function.
- Optionalcontext: any
  The context to invoke the listener with.
Returns EventEmitter
this.
Function
event.on

Example
```
me.event.on("event-name", myFunction, this);
```
- Defined in src/system/event.js:565