Question

Which property is used to manage multiple event handlers?

(a) onmessage

(b) onerror

(c) both onmessage and onerror

(d) postmessage

I had been asked this question during an internship interview.

The origin of the question is Web Workers topic in section Caching, Debugging and Animation of JavaScript

Answer 1

Right answer is (c) both onmessage and onerror

The best I can explain: message event is fired when the worker’s parent receives a message from its worker which is also available via the onmessage property. You can use onmessage and onerror properties if you want to manage multiple event handlers.