// IOS设备上使一般容器的scroll区域获得弹性滑动效果
.scroll(@direction: y) {

    & when (@direction = xy) {
        overflow: auto;
    }

    & when (@direction = x) {
        overflow-x: auto;
        overflow-y: hidden;
    }

    & when (@direction = y) {
        overflow-x: hidden;
        overflow-y: auto;
    }

    -webkit-overflow-scrolling: touch;
}