直接上代码
/**
* @param string $code
* @param string $msg
* @param array $data
* 返回json
*/
protected function return_json($code='',$msg='',$data=array()){
$arr = array(
'code' => $code,
'msg' =>$msg
);
$arr['data'] = $data;
json($arr,200, ['Access-Control-Allow-Origin'=> '*','Access-Control-Allow-Headers'=>'content-type,token,x-requested-with','Access-Control-Expose-Headers'=>'*','Access-Control-Allow-Methods'=>"GET,POST,PUT,DELETE,PATCH,OPTIONS"])->send();
exit;
}