this.$EventBus.$on

this.$EventBus.$on is a method used in Vue.js to listen for custom events. It allows components to communicate with each other by sending and receiving events.

When calling this.$EventBus.$on, you need to provide the event name as the first argument and a callback function as the second argument. The callback function will be executed when the event is emitted.

For example:

// Component A
this.$EventBus.$on('customEvent', (data) => {
  console.log('Received event:', data);
});

// Component B
this.$EventBus.$emit('customEvent', 'Hello from Component B!');

In the above example, Component A is listening for the 'customEvent' and will log the received data when the event is emitted from Component B using this.$EventBus.$emit.