string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%94%B6%E9%9B%86%E6%95%B0%E6%8D%AE%E7%9A%84%E6%96%B9%E6%B3%95%E6%9C%89%E5%93%AA%E4%B8%89%E7%A7%8D => Failed to connect to 101.89.117.144 port 38022: Connection refused"
收集数据的方法有哪三种
