django js 实现表格动态标序号

<table class="table table-striped">
                <thead>
                <tr class="key_words_head">
                    <th>序号th>
                    <th>类目th>
                    <th>关键词th>
                    <th>操作th>
                tr>
                thead>
                <tbody id="key_words_body">
                {% for keywords in classify_keywords_obj %}
                    <tr class="key_words_tbody">
                        <td id="td_num">td>
                        <td id="hide_id">{{ keywords.id }}td>
                        <td id="td_classify">{{ keywords.classify.classify_name }}td>
                        <td id="td_keywords">{{ keywords.keywords }}td>
                        <td><a href="javascript:void(0);" onclick="show_change_model('{{ keywords.id }}')">编辑a>
                            <a href="javascript:void(0);" style="color: red" onclick="del_settings('{{ keywords.id }}',this)">删除a>td>
                    tr>
                {% endfor %}
                tbody>
            table>