js滚轮滚动翻页原理

function debounce(func, wait) {
    let timeout;
    return function(...args) {
        clearTimeout(timeout);
        timeout = setTimeout(() => func.apply(this, args), wait);
    };
}

window.addEventListener('wheel', debounce(function(event) {
    if (event.deltaY > 0) {
        nextPage();
    } else if (event.deltaY < 0) {
        prevPage();
    }
}, 200));

function handleWheel(event) {
    event = event || window.event;
    var delta = event.deltaY || -event.wheelDelta;
    if (delta > 0) {
        nextPage();
    } else if (delta < 0) {
        prevPage();
    }
}

if (window.addEventListener) {
    window.addEventListener('wheel', handleWheel, false);
} else if (window.attachEvent) {
    window.attachEvent('onmousewheel', handleWheel);
}