YII 2.0 系统事件（默认触发点）
这里整理一下yii 2.0的默认事件
| beforeRequest | 解析路由之前 |
| beforeAction | |
| afterAction | |
| afterRequest | 路由处理完成 |
| beforeRender | |
| afterRender | |
| beforeSend | |
| afterSend | |
| afterPrepare | |
| beforeValidate | 数据验证 |
| afterValidate | |
| beginPage | 分页 |
| endPage | |
| init | 数据模型 |
| afterFind | |
| beforeInsert | |
| afterInsert | |
| beforeUpdate | |
| afterUpdate | |
| beforeDelete | |
| afterDelete | |
| afterOpen | |
| beginTransaction | |
| commitTransaction | |
| rollbackTransaction | |
| missingTranslation | |
| beforeLogin | 用户 |
| afterLogin | |
| beforeLogout | |
| afterLogout |