在窗口滚动上移动元素

我找到了这个

https://codepen.io/JTParrett/pen/BkDie

$.fn.moveIt = function(){
var $window = $(window);
var instances = [];

$(this).each(function(){
instances.push(new moveItItem($(this)));
});

window.addEventListener('scroll', function(){
var scrollTop = $window.scrollTop();
instances.forEach(function(inst){
  inst.update(scrollTop);
});
}, {passive: true});
}

var moveItItem = function(el){
this.el = $(el);
this.speed = parseInt(this.el.attr('data-scroll-speed'));
};

moveItItem.prototype.update = function(scrollTop){
  this.el.css('transform', 'translateY(' + -(scrollTop / this.speed) + 
'px)');
};

// Initialization
$(function(){
  $('[data-scroll-speed]').moveIt();
});