* 获取授权码code缓存值 | 传入参 | 说明 | | --- | --- | | u_id | [ 必填 ] 用户索引 | | 回调参 | 说明 | | --- | --- | | [code] | 授权码 | *案例 ~~~ $code = $DouYin->code($u_id); ~~~