Does SetInterval run things on a seperate thread? How does the method work?

问题

I've looked around trying to understand how SetInterval but only found how to use it. I already know it's functionality, I'm just curious about how it's able to run something on a separate thread when JS doesn't support threading(at least that's what I read).

I hope I formulated the question properly.

Thanks.

回答1:

setInterval does not run anything on a different thread. It schedules something to run at certain times provided the JS runtime is idle at that time.

You can try out this behavior with something like this:

setInterval(function(){ alert("Hello"); }, 1000);
while (true) { }

The infinite loop will prevent the function from running, because the JS runtime is stuck in the loop.

来源：https://stackoverflow.com/questions/29973224/does-setinterval-run-things-on-a-seperate-thread-how-does-the-method-work