string(303) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%86%E5%8C%96%E7%9A%84%E4%BD%9C%E7%94%A8%E5%8F%AF%E5%BD%92%E7%BA%B3%E4%B8%BA%E5%93%AA%E4%B8%89%E7%82%B9 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
数据可视化的作用可归纳为哪三点
