               '<button lay-event="del" class="layui-btn layui-btn-sm layui-btn-danger icon-btn"><i class="layui-icon">&#xe640;</i>删除</button>&nbsp;',
                '<button lay-event="import" class="layui-btn layui-btn-sm layui-btn-warm icon-btn"><i class="layui-icon">&#xe681;</i>导入</button>',
                '</p>'].join(''),
            cellMinWidth: 100,
            cols: [[
                {type: 'checkbox'},
                {type: 'numbers'},
                {field: 'username', title: