layui 请求返回401token 过期 重新登陆

table.render({
          elem: '#admin'
  ,height: 'full-50'
          ,url: requestUrl+'admin/page'
          ,toolbar: '#toolbarDemo'
  ,method:'post'
  ,contentType:"application/json"
  ,async: true
  ,headers: {
    token : localStorage.token
  }
  ,request: {
        pageName: 'pageNum' //页码的参数名称，默认：page
        ,limitName: 'pageSize', //每页数据量的参数名，默认：limit
           }
          ,defaultToolbar: ['filter', 'exports', 'print', {
              title: '提示',
              layEvent: 'LAYTABLE_TIPS',
              icon: 'layui-icon-tips'
          }],
          cols: [[
             {field:'admId', width:100, title: 'ID', sort: true}
              ,{field:'admUser', width:100, title: '账号'}
              ,{field:'admPsw', width:100, title: '密码'}
              ,{field:'admName', width:100, title: '用户名'}
              ,{field:'admSex', width:100, title: '性别', align: "center"}
              ,{title: '操作', minWidth: 150, toolbar: '#currentTableBar', align: "center"}
          ]],
          limits: [5,10, 15, 20],
          limit: 10,
          page: true,
          skin: 'line'
      });

$.ajax({
       type:"post",
       url: requestUrl+"/app",
       dataType:"json",
       ,headers: {
    token : localStorage.token
  }
       contentType:"application/json",
       data: JSON.stringify(data),
       success: function(data) {
    console.log(data)
       },
     });