jquery 当前滚动条高度

$(window).scroll(function() {
    var scrollTop = $(window).scrollTop();
    console.log("当前滚动条高度：" + scrollTop);
});

window.addEventListener('scroll', function() {
    var scrollTop = window.pageYOffset || document.documentElement.scrollTop;
    console.log("当前滚动条高度：" + scrollTop);
});

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

$(window).scroll(throttle(function() {
    var scrollTop = $(window).scrollTop();
    console.log("当前滚动条高度：" + scrollTop);
}, 200));

function debounce(func, wait) {
    var timeout;
    return function() {
        var context = this, args = arguments;
        clearTimeout(timeout);
        timeout = setTimeout(function() {
            func.apply(context, args);
        }, wait);
    };
}

$(window).scroll(debounce(function() {
    var scrollTop = $(window).scrollTop();
    console.log("当前滚动条高度：" + scrollTop);
}, 200));