dataTables添加扩展excel后无法显示按钮啊，有大神们知道吗

Question

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<link href="../../../css/css.css" rel="stylesheet" type="text/css" />

<link href="../../../css/demo_table.css" rel="stylesheet" type="text/css"/>

<link href="../../../css/jquery.dataTables.min.css" rel="stylesheet" type="text/css" />

<link href="../../../css/buttons.dataTables.min.css" rel="stylesheet" type="text/css"/>

<script language="JavaScript" src="../../../js/jquery-1.8.3.js"></script>

<script language="JavaScript" src="../../../js/parameter.js"></script>

<script language="JavaScript" src="../../../js/jquery.json-2.4.js"></script>

<!-- <script language="JavaScript" src="../../../js/jquery.dataTables.js"></script> -->

<script language="JavaScript" src="../../../js/datatables.js"></script>

<script language="JavaScript" src="../../../js/jquery-init.js"></script> 

<script language="JavaScript" src="../../../js/dataTables.buttons.js"></script> 

<script language="JavaScript" src="../../../js/buttons.html5.min.js"></script> 

<script language="JavaScript" src="../../../js/jquery.dataTables.min.js"></script>

<!-- <script language="JavaScript" src="../../../js/dataTables.bootstrap.min.js"></script> -->

<script language="JavaScript" src="../../../js/jszip.min.js"></script>

<script language="JavaScript" src="../../../js/dataTables.buttons.min.js"></script> 

<!-- <script language="JavaScript" src="../../../js/dataTables.buttons.js"></script> -->

<!-- <script language="JavaScript" src="../../../js/jquery-3.2.1.js"></script>

<script language="JavaScript" src="../../../js/jquery-3.2.1.min.js"></script> -->

<script language="JavaScript" src="../../../js/jquery.table2excel.js"></script>

<script language="JavaScript" src="../../../js/fnPagingInfo.js"></script>

<script type="text/javascript">

Answer 1

"oLanguage" : {//汉化 "sLengthMenu" : "每页显示 _MENU_ 条记录", "sZeroRecords" : "  ", "sInfo" : "当前记录为从第 _START_ 到第 _END_ 条；总共有 _TOTAL_ 条记录", "sInfoEmtpy" : "没有数据", "sProcessing" : "正在加载数据...", "oPaginate" : { "sFirst" : "首页", "sPrevious" : "上一页", "sNext" : "下一页", "sLast" : "尾页" } },      "dom": 'Bfrtip',      /* "buttons": [ 'excel','csv'   ], */                 "buttons": [ { 'extend': 'excel', 'text': '导出',//定义导出excel按钮的文字 'className': 'btn btn-primary', //按钮的class样式 } ],  }