为什么 AND 逻辑功能在我的情况下不起作用？

Question

I'm trying to create shortcut when I press ctrl and space the inside function works, but it doesn't. I'm trying with || and it works.

document.addEventListener("keydown", function(event) {
    if ((event.keyCode == 17) && (event.keyCode == 32)) {
        alert('Hello');
    }
});

Help please. Thank you.

Answer 1

There is an event.ctrlKey flag for the event.

 document.addEventListener("keydown", function(event) { if (event.ctrlKey && event.keyCode === 32) { alert('Hello'); } });

 html, body { width: 100%; height: 100%; margin: 0; padding: 0; } body { display: flex; justify-content: center; align-items: center; font-size: 2em; } kbd { border: 3px #EEE outset; padding: 0.125em; }

 <p>Type <kbd>Ctrl</kbd> + <kbd>Space</kbd></p>

Answer 2

event.keyCode不能同时具有值​​ 17 和 32，因此您的条件没有意义。