微任务如何使其进入微任务队列？

Question

I'm currently researching the Javascript event loop, concurrency, micro/macro task queues.

I see that when using setTimeout, the Browser's Web Api handles the timer and passes the callback on to the macrotask queue to be run by the call stack via the event loop.

However, in the case of a microtask, such as a Promise, is the Browser's Web Api also responsible for handling and passing to the microtask queue?

If not, what is handling this process?

Answer 1

The microtask queue is specified in the ES spec. The spec is implemented by JavaScript engines (most of them are browsers).

There is no such thing as "the Browser's Web Api", there are the Web Specs which defines setTimeout and such, browsers also implements that spec.