keyframe Not perform

[zhangjiadexiaohai]

function initSkrollr() { mySkrollr = skrollr.init({
smoothScrolling:false, mobileDeceleration: 0.002, keyframe:function(element, name, direction){
var nameDir = name + "." + direction;
if (element == $page2[0]) { if (nameDir == "dataBottomTop.down" || nameDir == "dataTopBottom.up") { $pageBGs.eq(0).addClass('active'); } else if (nameDir == "dataBottomTop.up" || nameDir == "dataTopBottom.down") { $pageBGs.eq(0).removeClass('active'); } } else if (element == $page4[0]) { if (nameDir == "dataBottomTop.down" || nameDir == "dataTopBottom.up") { $pageBGs.eq(1).addClass('active'); } else if (nameDir == "dataBottomTop.up" || nameDir == "dataTopBottom.down") { $pageBGs.eq(1).removeClass('active'); } } else if (element == $page6[0]) { if (nameDir == "dataBottomTop.down" || nameDir == "dataTopBottom.up") { $pageBGs.eq(2).addClass('active'); } else if (nameDir == "dataBottomTop.up" || nameDir == "dataTopBottom.down") { $pageBGs.eq(2).removeClass('active'); } } }
}); }