使用jquery或vanilla Javascript滚动事件捕获

Question

How can i catch scroll event? For example 1024px scroll down to top notify appears. I'm stuck at this code;

(function () {
    var previousScroll = 0;

    $(window).scroll(function(){
    var currentScroll = $(this).scrollTop();
        if (currentScroll > previousScroll){
            notify appears
        } else {
            notify appears
        }
     previousScroll = currentScroll;
      });
}());

Answer 1

try this

$(window).scroll(function() {
  var scrollTop = $(window).scrollTop();
  if ( scrollTop > 1024 ) { 
    //your code block
  }
});

the scrollTop() method sets or returns the vertical scrollbar position for the selected elements.