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// 滚动条滑动到底部，开始加载
$(window).on('scroll', function(){
  var docHeight = Drupal.verycdn_tools.getDocHeight();
  var scrollTop = $(this).scrollTop();
  var winHeight = $(this).height();
  if(scrollTop >= docHeight - winHeight) {
    //TODO
  }
});

Drupal.verycdn_tools.getDocHeight = function () {
  var doc = document;
  return Math.max(
    Math.max(doc.body.scrollHeight, doc.documentElement.scrollHeight),
    Math.max(doc.body.offsetHeight, doc.documentElement.offsetHeight),
    Math.max(doc.body.clientHeight, doc.documentElement.clientHeight)
  );
}