Model.php
public function event($event)
    {
        if (!isset($this->_events[$event])) {
            throw new Exception("不支持事件：" . $event);
        }
        $this->_events[$event] = true;
        return $this;
    }
public function event($event)
    {
        if (!isset($this->_events[$event])) {
            throw new Exception("不支持事件：" . $event);
        }
        $this->_events[$event] = true;
        return $this;
    }
唤起事件