/**
  * api入口
  */
 public function api()
 {
     $this->userInfo = D('User')->getUserFromOpenId(ImWx::getRequestUserId());
     switch (ImWx::getRequestType()) {
         case 'text':
             $this->_handleTextMessage();
             break;
         case 'event':
             $this->_handleEventMessage();
             break;
         case 'image':
         case 'link':
         case 'location':
         case 'voice':
             ImWx::fetchTextResult('……');
             break;
     }
     $this->responseError(new CommonException('200202'));
 }