老师为什么背影导航动画实现不出来，代码也没错啊。
.st-scrool{
left:0;
top:0;
-webkit-transform:translate3d(0,0,0);
-moz-transform:translate3d(0,0,0);
-o-transform:translate3d(0,0,0);
-ms-transform:translate3d(0,0,0);
transform:translate3d(0,0,0);
-webkit-backface-visibility:hidden;
-webkit-transition:all 0.6s ease-in-out;
-moz-transition:all 0.6s ease-in-out;
-o-transition:all 0.6s ease-in-out;
-ms-transition:all 0.6s ease-in-out;
transition:all 0.6s ease-in-out;
}
