我在通过脚手架生成器创建的Rails视图中使用DOM数据时遇到了同样的问题。默认情况下，视图为最后三列(包含显示、隐藏和销毁记录的链接)省略<th>元素。我发现，如果我在<thead>内的<th>元素中为这些列添加标题，它就解决了这个问题。

I can't say if this is the same problem you're having since I can't see your html. If it is not the same problem, you can use the chrome debugger to figure out which column it is erroring out on by clicking on the error in the console (which will take you to the code it is failing on), then adding a conditional breakpoint (at col==undefined). When it stops you can check the variable i to see which column it is currently on which can help you figure out what is different about that column from the others. Hope that helps!

对我来说，这个问题与上面给出的答案略有不同。对我来说，HTML标记很好，但是javascript中的一列缺失了，并且与HTML不匹配。

i.e.

<table id="companies-index-table" class="table table-responsive-sm table-striped">

                            <thead>
                            <tr>
                                <th>Id</th>
                                <th>Name</th>
                                <th>Created at</th>
                                <th>Updated at</th>
                                <th>Count</th>
                            </tr>
                            </thead>
                            <tbody>
                            @foreach($companies as $company)
                                <tr>
                                    <td>{{ $company->id }}</td>
                                    <td>{{ $company->name }}</td>
                                    <td>{{ $company->created_at }}</td>
                                    <td>{{ $company->updated_at }}</td>
                                    <td>{{ $company->count }}</td>
                                </tr>
                            @endforeach
                            </tbody>
                        </table>

我的脚本:

<script>
        $(document).ready(function() {
            $('#companies-index-table').DataTable({
                serverSide: true,
                processing: true,
                responsive: true,
                    ajax: "{{ route('admincompanies.datatables') }}",
                columns: [
                    { name: 'id' },
                    { name: 'name' },
                    { name: 'created_at' },
                    { name: 'updated_at' },     <-- I was missing this line so my columns didn't match the thead section.
                    { name: 'count', orderable: false },
                ],
            });
        });
    </script>

供参考，数据表需要一个格式良好的表。它必须包含<thead>和<tbody>标签，否则将抛出此错误。还要检查确保包括标题行在内的所有行具有相同的列数。

以下将抛出错误(没有<thead>和<tbody>标签)

<table id="sample-table">
    <tr>
        <th>title-1</th>
        <th>title-2</th>
    </tr>
    <tr>
        <td>data-1</td>
        <td>data-2</td>
    </tr>
</table>

下面也会抛出一个错误(列数不等)

<table id="sample-table">
    <thead>
        <tr>
            <th>title-1</th>
            <th>title-2</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>data-1</td>
            <td>data-2</td>
            <td>data-3</td>
        </tr>
    </tbody>
</table>

更多信息请点击这里

In my case, and using ASP.NET GridView, UpdatePanel and with DropDownList (with Chosen plugin where I reset value to zero using a Javascript line), I got this error and tried everything with no hope for days. The problem was that the code of my dropdown in code behind was as follows and when I select a value twice to apply its action to selected grid rows I get that error. I thought for days it's a Javascript issue (again, in my case) and finally the fix was giving zero for the drowpdown value with the update process:

  private void ddlTasks_SelectedIndexChanged(object sender, System.EventArgs e)
  {
     if (ddlTasks.SelectedValue != 0) {
        ChangeStatus(ddlTasks.SelectedValue);
        ddlTasks.SelectedValue = "0"; //// **This fixed my issue**
     }

     dvItemsGrid.DataSource = CreateDatasource();
     dvItemsGrid.DataBind();
     dvItemsGrid.UseAccessibleHeader = true;
     dvItemsGrid.HeaderRow.TableSection = TableRowSection.TableHeader;

  }

这是我的错:

     $('#<%= DropDownList.ClientID%>').val('0').trigger("chosen:updated").chosen();

我遇到了同样的错误，当试图添加colspan最后th

<table>
  <thead>
    <tr>    
      <th>&nbsp;</th> <!-- column 1 -->
      <th colspan="2">&nbsp;</th> <!-- column 2&3 -->
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
  </tbody>
</table>

并通过在tr末尾添加隐藏列来解决它

<thead>
  <tr>    
    <th>&nbsp;</th> <!-- column 1 -->
    <th colspan="2">&nbsp;</th> <!-- column 2&3 -->

    <!-- hidden column 4 for proper DataTable applying -->
    <th style="display: none"></th> 
  </tr>
</thead>

<tbody>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>

    <!-- hidden column 4 for proper DataTable applying -->
    <td style="display: none"></td>
  </tr>
</tbody>

对此的解释是，由于某些原因，DataTable不能应用于colspan位于最后th的表，但可以应用于colspan位于任何中间th的表。

这个解决方案有点俗气，但比我找到的任何其他解决方案都更简单、更短。

我希望这能帮助到一些人。

发生这种情况的另一个原因是DataTable初始化中的columns参数。

列的数量必须与标题相匹配

"columns" : [ {
                "width" : "30%"
            }, {
                "width" : "15%"
            }, {
                "width" : "15%"
            }, {
                "width" : "30%"
            } ]

我有7列

<th>Full Name</th>
<th>Phone Number</th>
<th>Vehicle</th>
<th>Home Location</th>
<th>Tags</th>
<th>Current Location</th>
<th>Serving Route</th>