point_mall_card/application/api/controller/Api.php

<?php
namespace app\api\controller;
use think\Controller;

/**
* 接口父类
*/
class Api extends Controller{

  protected function _initialize(){
    $this->header();
    $this->init();
  }

  protected function header(){
    header('Access-Control-Allow-Origin:*');
    header('Content-type: application/json;chartset=uft-8');
    if( $_SERVER['REQUEST_METHOD'] == 'OPTIONS'){
      exit;
    }
  }

  protected function init(){
    
  }

  public function output($code,$msg,$data = [],$count = 0){
      try {
        // 返回JSON数据格式到客户端 包含状态信息
        $count = $count == 0?count($data):$count;
        $data = json_encode(['code'=>$code,'msg'=>$msg,'data'=>$data,'count'=>$count], JSON_UNESCAPED_UNICODE);
        if ($data === false) {
          throw new \InvalidArgumentException(json_last_error_msg());
        }

        header('Content-type: application/json');
        echo $data;exit();
      } catch (\Exception $e) {
        if ($e->getPrevious()) {
          throw $e->getPrevious();
        }
        throw $e;
      }
    } 
}