string(261) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=nfc%E6%98%AF%E4%BB%80%E4%B9%88%E5%8A%9F%E8%83%BD%E5%9C%A8%E6%89%8B%E6%9C%BA%E5%93%AA%E9%87%8C => Failed to connect to 125.88.227.171 port 38062: Connection refused"
nfc是什么功能在手机哪里
