滚动方向

scroll-direction.js

var scrollFunc = function (e) {
  var direct = 0
  e = e || window.event
  if (e.wheelDelta) {  //判断浏览器IE，谷歌滑轮事件             
    if (e.wheelDelta > 0) { //当滑轮向上滚动时
      console.log("滑轮向上滚动")
    }
    if (e.wheelDelta < 0) { //当滑轮向下滚动时
      console.log("滑轮向下滚动")
    }
  } else if (e.detail) {  //Firefox滑轮事件
    if (e.detail> 0) { //当滑轮向上滚动时
      console.log("滑轮向上滚动")
    }
    if (e.detail< 0) { //当滑轮向下滚动时
      console.log("滑轮向下滚动")
    }
  }
}
//给页面绑定滑轮滚动事件
if (document.addEventListener) {
  document.addEventListener('DOMMouseScroll', scrollFunc, false)
}
//滚动滑轮触发scrollFunc方法
window.onmousewheel = document.onmousewheel = scrollFunc