1 、在common（我是在common，你自己看，反正是用命名空间载入）里新建目录taglib

2、在taglib里新建Cc.php 继承think的Tglib，代码如下：

<?php
/**
 * Created by PhpStorm.
 * User: lichenchen
 * Date: 2018/3/25
 * Time: 下午8:34
 */
namespace app\common\taglib;
use think\template\TagLib;
use app\common\model\Article;
class Cc extends TagLib
{


    protected $tags = [
        'articles' => ['attr'=> 'field,id,limit,cid,order,returnname', 'close'=>1]
    ];
    /**
     * 文章标签
     */
    public function tagArticles($tag, $content)
    {
        $id = $tag['id']?$tag['id']:'vo';
        $order         = empty($tag['order']) ? "'id DESC'" : '"'.$tag['order'].'"';
        $returnname = 'article_data';
        $field = "''";
        if (!empty($tag['field'])) {
            if (strpos($tag['field'], '$') === 0) {
                $field = $tag['field'];
                $this->autoBuildVar($field);
            } else {
                $field = "'{$tag['field']}'";
            }
        }
        $cid = "''";
        if (!empty($tag['cid'])) {
            if (strpos($tag['cid'], '$') === 0) {
                $cid = $tag['cid'];
                $this->autoBuildVar($cid);
            } else {
                $cid = "'{$tag['cid']}'";
            }
        }
        $limit = "''";
        if (!empty($tag['limit'])) {
            if (strpos($tag['limit'], '$') === 0) {
                $limit = $tag['limit'];
                $this->autoBuildVar($limit);
            } else {
                $limit = "'{$tag['limit']}'";
            }
        }else{
            $limit = '0,5';
        }
        $parse = <<<parse
<?php
    \$$returnname = \app\common\model\Article::taglib_articles([
    'field'   => {$field},
    'cid'=>{$cid},
    'limit'=>{$limit},
    'order'=>{$order}
]);
?>
{volist name="{$returnname}" id="{$id}"}
{$content}
{/volist}
parse;
        return $parse;
    }
}

这里演示的是一个文章标签 articles

里面调用了Article模型的静态方法taglib_articles , 顺便也贴下代码吧，就是根据条件查询的

public static function taglib_articles($param)
    {
        $field = $param['field'];
        $cid = $param['cid'];
        $limit = $param['limit'];
        $order = $param['order'];
        $result = Article::where('cid', 'in',$cid)->field($field)->limit($limit)->order($order)->select();
        return $result;
    }

之后，在tp的配置文件里，加一条配置载入自定义标签文件的 

// +----------------------------------------------------------------------
    // | 模板设置
    // +----------------------------------------------------------------------
    'template'               => [
        // 模板引擎类型 支持 php think 支持扩展
        'type'         => 'Think',
        // 模板路径
        'view_path'    => '',
        // 模板后缀
        'view_suffix'  => 'html',
        // 模板文件名分隔符
        'view_depr'    => DS,
        // 模板引擎普通标签开始标记
        'tpl_begin'    => '{',
        // 模板引擎普通标签结束标记
        'tpl_end'      => '}',
        // 标签库标签开始标记
        'taglib_begin' => '{',
        // 标签库标签结束标记
        'taglib_end'   => '}',
        'taglib_pre_load'     =>    'app\common\taglib\Cc', 
    ],

就是：'taglib_pre_load'     =>    'app\common\taglib\Cc', 这条 。

之后就可以在模版里使用了

{cc:articles cid="1" field='id,title' limit="2" order="id asc" id="vo"}
<li><a href="#">{$vo.title}</a></li>
{/cc:articles}