你可以使用以下代码：

var calcDataTableHeight = function() {
  return $(window).height() * 55 / 100;
};

var oTable = $('#reqAllRequestsTable').dataTable({
  "sScrollY": calcDataTableHeight();
});

$(window).resize(function() {
  var oSettings = oTable.fnSettings();
  oSettings.oScroll.sY = calcDataTableHeight(); 
  oTable.fnDraw();
});