customs event

// First create the event var myEvent = new CustomEvent("userLogin", {

	detail: {

		username: "davidwalsh"

	}

});

//Listener event 

myElement.addEventListener("userLogin", function(e) {

 console.info("Event is: ", e); console.info("Custom data is: ", e.detail); })

// Trigger it! myElement.dispatchEvent(myEvent);
详细请到此URL:https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent