js ajax跨域被阻止 CORS 头缺少 'Access-Control-Allow-Origin'

1.问题一直走error

解决问题

问

先打印请求 要是textStatus 是undefined把dataType: ‘json’,换成dataType: ‘text’,还是undefined那就看是不是cors阻止跨域问题
在php添加header头

<?php
/*
	小程序接口
*/
require 'common.inc.php';
require DT_ROOT.'/include/module.func.php';
require DT_ROOT.'/include/post.func.php';
require DT_ROOT.'/include/jjapp/member/registe.class.php';
require DT_ROOT.'/include/jjapp/information/information.class.php';
require DT_ROOT.'/include/jjapp/follow/follow.class.php';
// 解决cors

header('content-type:application:json;charset=utf8');
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Methods:POST');
header('Access-Control-Allow-Headers:x-requested-with,content-type');
?>