jquery滚动加载数据

$(window).scroll(function() {
  var totalheight = parseFloat($(window).height()) + parseFloat($(window).scrollTop());
  var docHeight = $(document).height();
  var diff = docHeight - totalheight;
  
  // var log = "";
  // log += "docHeight: " + docHeight;
  // log += " totalheight: " + totalheight;
  // log += " diff: " + diff;
  // console.log(log);
  
  if(diff <= 10){
    console.log('loadData...');
    loadData();
  }
  
 });