tabel thead »¬¶¯¹Ì¶¨¶¥²¿

• ÊÔÁ˼¸ÖÖ·½·¨£¬»¹ÊÇ translateY ±È½Ï¿¿Æ×
• ·ÅÆú ie

// ¹Ì¶¨Í·²¿
var thead_top = $('thead').offset().top;
$(window).scroll(function() {
  var sctop = $(this).scrollTop();
  if(sctop > 60){
    var ty = sctop - thead_top;
    thead.css({'transform':'translateY('+ ty +'px)'});
  } else{
    thead.css({'transform':'translateY(0px)'});
  }
})