jQuery：在水平滚动上告诉哪个元素在视口中

这个问题在这里已经有了答案：

滚动38个答案后，检查元素是否可见

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假设#stickers拥有正确的CSS来进行溢出滚动（如果没有，您的滚动处理程序将永远不会触发。）

var scrollingIsThrottled = false;
var sticker = $(".sticker");
$("#stickers").scroll(function() {
  var stickers_width = $(this).width();
  if (!scrollingIsThrottled) {
    scrollingIsThrottled = true;

    var StickerMatchingExpression = sticker.filter(function() {
      var $this = $(this);
      var left_of_element = $this.offset().left;
      var right_of_element = left_of_element + $this.width();
      return 0 <= left_of_element && right_of_element <= stickers_width;
    });
    scrollingIsThrottled = false;
  }
});

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