dataTables添加扩展excel后无法显示按钮啊，有大神们知道吗

Question

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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

}

], 

}