Use js+css+html to achieve fixed table column headers that do not move

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1. CSS

<style type="text/css">
  #scroll_head {
    position: absolute;
    display: none;
  }
</style>

2. Javascript

<script type="text/javascript">
  //该函数在上面一个table数据加载完成后调用
  //把表头的宽度设置到会滚动的页头去
  var copyWidth = function () {
    var b = $(&#39;#data_tbody&#39;).prev().find(&#39;tr:last&#39;).find(&#39;th&#39;);
    var c = $(&#39;#scroll_head&#39;).find(&#39;tr:last&#39;).find(&#39;th&#39;);
    for (var i = 0; i < b.length; i++) {
      var newWith = b.eq(i).width();
      if ($.browser.msie) {
        newWith += 1;
      }
      c.eq(i).width(newWith);
    }
  }
  $(function () {
    $(window).scroll(function () {
      if ($(&#39;#data_tbody&#39;).length > 0) {
        var thead = $(&#39;#data_tbody&#39;).prev();
        var thOffset = thead.offset();
        var scTop = $(window).scrollTop(); //滚动条相对top的位置
        if (scTop > thOffset.top) {  //滚动条滚到thead及以下的位置，用临时的thead代替显示
          $(&#39;#scroll_head&#39;).css(&#39;display&#39;, &#39;block&#39;);
          $(&#39;#scroll_head&#39;).offset({ top: scTop, left: thOffset.left });
        }
        else { //滚动条滚到thead上的位置，用table的原始thead显示
          $(&#39;#scroll_head&#39;).css(&#39;display&#39;, &#39;none&#39;);
        }
      }
    });
  });
</script>

3. Html content

<div id="data_div">
  <table>
    @*thead内容及样式同scroll_head中的thead*@
    @*thead使用深背景色，避免滚动时和tbody内容重叠显示*@
    <thead>
      <tr>
        @*一级标题*@
        <th class="tt1" colspan="2">一级1</th>
        <th class="tt2" colspan="5">一级2</th>
        <th class="tt3" colspan="6">一级3</th>
      </tr>
      <tr>
        @*二级标题*@
        <th style="width: 23px;">二级11</th>
        <th style="width: 36px;">二级12</th>
        <th class="tt" style="width: 40px;">二级21</th>
        <th class="tt" style="width: 30px;">二级22</th>
        <th class="tt" style="width: 30px;">二级23</th>
        <th class="tt" style="width: 30px;">二级23</th>
        <th class="tt" style="width: 30px;">二级24</th>
        <th class="tt" style="width: 30px;">二级25</th>
        <th class="tt" style="width: 30px;">二级31</th>
        <th class="tt" style="width: 30px;">二级32</th>
        <th class="tt" style="width: 30px;">二级33</th>
        <th class="tt" style="width: 30px;">二级33</th>
        <th class="tt" style="width: 30px;">二级34</th>
        <th class="tt" style="width: 30px;">二级35</th>
        <th class="tt" style="width: 30px;">二级36</th>
      </tr>
    </thead>
    <tbody id="data_tbody">
      数据内容，在数据加载完成后调用copyWidth()函数解决兼容性
    </tbody>
  </table>
</div>
<div id="scroll_head" style="display:block; top: 168px; left: 0px; position: relative;">
  <table width="100%">
    <thead> @*thead使用深背景色，避免滚动时和tbody内容重叠显示*@
      <tr>
        @*一级标题*@
        <th class="tt1" colspan="2">一级1</th>
        <th class="tt2" colspan="5">一级2</th>
        <th class="tt3" colspan="6">一级3</th>
      </tr>
      <tr>
        @*二级标题*@
        <th style="width: 23px;">二级11</th>
        <th style="width: 36px;">二级12</th>
        <th class="tt" style="width: 40px;">二级21</th>
        <th class="tt" style="width: 30px;">二级22</th>
        <th class="tt" style="width: 30px;">二级23</th>
        <th class="tt" style="width: 30px;">二级23</th>
        <th class="tt" style="width: 30px;">二级24</th>
        <th class="tt" style="width: 30px;">二级25</th>
        <th class="tt" style="width: 30px;">二级31</th>
        <th class="tt" style="width: 30px;">二级32</th>
        <th class="tt" style="width: 30px;">二级33</th>
        <th class="tt" style="width: 30px;">二级33</th>
        <th class="tt" style="width: 30px;">二级34</th>
        <th class="tt" style="width: 30px;">二级35</th>
        <th class="tt" style="width: 30px;">二级36</th>
      </tr>
    </thead>
  </table>
</div>

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