键盘js

document.addEventListener('keydown', function(event) {
    console.log('Key pressed: ' + event.key);
});

document.addEventListener('keyup', function(event) {
    console.log('Key released: ' + event.key);
});

let isKeyPressed = false;

document.addEventListener('keydown', function(event) {
    if (!isKeyPressed) {
        isKeyPressed = true;
        console.log('Key pressed: ' + event.key);
        setTimeout(() => {
            isKeyPressed = false;
        }, 200); // 延迟200毫秒重置状态
    }
});

function addKeyboardListener(element, callback) {
    if (element.addEventListener) {
        element.addEventListener('keydown', callback, false);
    } else if (element.attachEvent) { // IE 8及以下
        element.attachEvent('onkeydown', callback);
    }
}

document.addEventListener('keydown', function(event) {
    if (event.ctrlKey && event.key === 's') {
        event.preventDefault(); // 阻止默认行为，如保存网页
        console.log('Ctrl + S pressed');
    }
});