js 判断滚动条

function hasVerticalScrollbar(element) {
    return element.scrollHeight > element.clientHeight;
}

// 使用示例
const element = document.getElementById('myElement');
if (hasVerticalScrollbar(element)) {
    console.log('存在垂直滚动条');
} else {
    console.log('不存在垂直滚动条');
}

// 获取
const scrollTop = element.scrollTop;

// 设置
element.scrollTop = 100; // 将滚动条设置为距离顶部100px的位置

element.addEventListener('scroll', function() {
    console.log('当前滚动位置:', this.scrollTop);
});

function throttle(func, wait) {
    let timeout = null;
    return function() {
        if (!timeout) {
            timeout = setTimeout(() => {
                func.apply(this, arguments);
                timeout = null;
            }, wait);
        }
    };
}

element.addEventListener('scroll', throttle(function() {
    console.log('当前滚动位置:', this.scrollTop);
}, 100)); // 每100毫秒最多执行一次

function hasHorizontalScrollbar(element) {
    return element.scrollWidth > element.clientWidth;
}