跨域

在后端接口中加上响应头Access-Control-Allow-Origin
比如我用SpringBoot写的一个接口

 @GetMapping("/queryUserList")
    public List<Member> queryMemberList(HttpServletResponse response){
        List<Member> memberList= memberMapper.queryMemberList();
        for (Member member : memberList) {
            System.out.println(member);
        }
        response.addHeader("Access-Control-Allow-Origin","*");
        return memberList;
    }
}