sitemap和sitemapindex

介绍：
https://support.google.com/webmasters/answer/75712?hl=zh-Hans

实例：
http://www.thepaper.cn/sitemap.xml

http://www.thepaper.cn/sitemap-1.xml
2017-10-13


http://www.thepaper.cn/asktopic.xml
2017-10-13


http://www.thepaper.cn/newsDetail-7.xml
2017-10-13


http://www.thepaper.cn/newsDetail-6.xml
2017-10-13


http://www.thepaper.cn/newsDetail-5.xml
2017-10-13


http://www.thepaper.cn/newsDetail-4.xml
2017-10-13


http://www.thepaper.cn/newsDetail-3.xml
2017-10-13


http://www.thepaper.cn/newsDetail-2.xml
2017-10-13


http://www.thepaper.cn/newsDetail-1.xml
2017-10-13