在滚动文档时，如果div的结尾出现在屏幕上，则修复它-使用jquery

$(window).scroll(function() {
  // 在这里编写代码
});

$(window).scroll(function() {
  var scrollTop = $(window).scrollTop();
});

$(window).scroll(function() {
  var scrollTop = $(window).scrollTop();
  var windowHeight = $(window).height();
});

$(window).scroll(function() {
  var scrollTop = $(window).scrollTop();
  var windowHeight = $(window).height();
  var divOffsetTop = $(element).offset().top;
});

$(window).scroll(function() {
  var scrollTop = $(window).scrollTop();
  var windowHeight = $(window).height();
  var divOffsetTop = $(element).offset().top;

  if (scrollTop + windowHeight >= divOffsetTop) {
    // 修复div的位置
    $(element).css('position', 'fixed');
    $(element).css('bottom', '0');
  }
});