     icon: 'layui-icon-tips'
            }],
            cols: [[
                {type: 'checkbox', fixed: 'left'}
                , {field: 'id', width: 100, title: 'ID', sort: true, fixed: 'left'},
                {field: 'avatar_url', width: 100, title: '头像', align: 'center', templet: '#imagePreview'},
                {field: 'username', width: 200, title: '用户名', sort: true, align: 'center'},
                {field: 'type', width: 80, title: '方式', sort: true, align: 'center'},
    