JavaScript keydown 事件未通过 setTimeout 触发

Question

I want to automatically trigger a keydown event after specific amount of time has passed. I set up a timout event for this with the code below:

setTimeout(
    function() {
        document.querySelector("body").dispatchEvent(new KeyboardEvent('keydown', {
            keyCode: 83,
            altKey: true
        }));
    },
    12000
);

However, it doesn't seem to trigger anything. Could anyone please help me in figuring out how can i send a keydown event in such cases?

Answer 1

I just tried your code and it triggers alright:

 document.querySelector("body").addEventListener('keydown', (e) => { console.log('triggered', e) }) setTimeout( function() { document.querySelector("body").dispatchEvent(new KeyboardEvent('keydown', { keyCode: 83, altKey: true })); }, 2000 );