Javascript后台运行代码

Question

Is there some sort of window.onThis(); function that I can set so that my code runs in a loop in the background?

window.onload = function() {while(true) {console.log("Blah")}}

This makes the page unresponsive. What is the recommended method of doing this?

I feel something's going over my head. Perhaps I'm looking at it the wrong way.

Answer 1

Javascript can only run one thread at a time, so when it is running console.log ("Blah") forever as fast as possible, it is unable to do anything else.

A better way would be to use setInterval , eg

var a  = setInterval(function () { console.log("blah"); }, 1000);
// Set the function to be called every 1000 milliseconds

//(optional) some time later
clearInterval(a);
// Stop the function from being called every second.

In general, a busy infinite loop ( while (true) { ... } ) is never a good idea.

See https://developer.mozilla.org/en-US/docs/Web/API/window.setInterval

Answer 2

It makes the page unresponsive because you've created an infinite loop. The while loop condition will always be true therefore the loop will never stop running.

I think you are looking for setInterval(), see here https://developer.mozilla.org/en-US/docs/Web/API/window.setInterval