angular没有自带ng-scroll【本文首发于唐霜的博客】【作者：唐霜】，只能自己写个directive来代替：

module.exports = ['$parse', ($parse) => {
  'ngInject'

  return {
    restrict: 'A',
    link: (scope, element, attrs) => {
      element.on('scroll', () => {
        let scripts = attrs.ngScroll
        let parse = $parse(scripts)
        parse(scope)
        scope.$apply()
      })
    }
  }
}]