string(241) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=nfc%E6%98%AF%E6%89%8B%E6%9C%BA%E4%B8%8A%E4%BB%80%E4%B9%88%E5%8A%9F%E8%83%BD => Failed to connect to 61.171.74.35 port 38027: Connection refused"
nfc是手机上什么功能
