查了查原因发现是Nginx开启了防盗链的缘故,然后把防盗链关闭即可正常访问图片了

# 注释以下nginx配置
location ~ .*\.(wma|wmv|asf|mp3|mmf|zip|rar|jpg|gif|png|swf|flv|mp4)$ {
    valid_referers none blocked *.hoehub.com wxapp.hoehub.com;
    if ($invalid_referer) {
        return 403;
    }
}