js控制滚动速度

let isScrolling = false;

window.addEventListener('wheel', function(event) {
    if (isScrolling) return;
    isScrolling = true;

    let delta = event.deltaY; // 获取滚动的距离
    let scrollStep = delta * 0.5; // 调整滚动速度，数值越小滚动越慢
    let currentScroll = window.scrollY;
    let targetScroll = currentScroll + scrollStep;

    smoothScrollTo(targetScroll);

    function smoothScrollTo(targetPosition) {
        const startPosition = window.scrollY;
        const distance = targetPosition - startPosition;
        const duration = 200; // 滚动持续时间，单位毫秒
        let startTime = null;

        function animation(currentTime) {
            if (startTime === null) startTime = currentTime;
            const timeElapsed = currentTime - startTime;
            const run = ease(timeElapsed, startPosition, distance, duration);
            window.scrollTo(0, run);
            if (timeElapsed < duration) requestAnimationFrame(animation);
            else isScrolling = false;
        }

        function ease(t, b, c, d) {
            t /= d / 2;
            if (t < 1) return c / 2 * t * t + b;
            t--;
            return -c / 2 * (t * (t - 2) - 1) + b;
        }

        requestAnimationFrame(animation);
    }
});

let scrollInterval;

window.addEventListener('wheel', function(event) {
    let delta = event.deltaY;
    let scrollStep = delta * 0.5; // 调整滚动速度
    let currentScroll = window.scrollY;
    let targetScroll = currentScroll + scrollStep;

    clearInterval(scrollInterval);
    scrollInterval = setInterval(function() {
        if ((scrollStep > 0 && window.scrollY >= targetScroll) || (scrollStep < 0 && window.scrollY <= targetScroll)) {
            window.scrollTo(0, targetScroll);
            clearInterval(scrollInterval);
        } else {
            window.scrollBy(0, scrollStep);
        }
    }, 16); // 大约每秒60帧
});