dataTables.bootstrap 如何显示中文

$('#table_cust').DataTable({
    "oLanguage": {
        "sUrl": "/assets/vendors/page_zh_CN.json"
 },

page_zh_CN.json 内容如下：

{
  "sProcessing":   "处理中...",
  "sLengthMenu": "_MENU_ 记录/页",
 "sZeroRecords": "没有匹配的记录",
 "sInfo": "显示第 _START_ 至 _END_ 项记录，共 _TOTAL_ 项",
 "sInfoEmpty": "显示第 0 至 0 项记录，共 0 项",
 "sInfoFiltered": "(由 _MAX_ 项记录过滤)",
 "sInfoPostFix": "",
 "sSearch": "过滤:",
 "sUrl": "",
 "oPaginate": {
 "sFirst": "首页",
 "sPrevious": "上页",
 "sNext": "下页",
 "sLast": "末页"
 }
}