http://www.xbiao.com/static/omega2016/
test
data-100="left:1000px; opacity: 0; filter:alpha(opacity=0);" data-500="left:782px;opacity: 1; filter:alpha(opacity=100);"
data-100距离文档顶部100px，动画开始
data-100距离文档顶部500px，动画结束
https://github.com/Prinzhorn/skrollr