waiting TTFB时间过长怎么办
waiting TTFB时间过长的解决办法：首先使用谷歌浏览器开发者工具调到Network；然后在sublime编辑器中die掉所有PHP代码；最后将“host=localhost”更改为“host=127.0.0.1”即可。
waiting（TTFB）时间过长怎么办？
本人在学习ajax无刷新分页的过程中，发现换页响应时间很长，要1秒以上
现将解决问题的步骤记录如下，希望能帮到遇到同样问题的小伙伴
1、使用谷歌chrome浏览器开发者工具（按F12打开），调到Network
2、可以看到是waiting（TTFB）时间过长要1秒左右，直接转到PHP页面测试，还是同样问题
3、sublime编辑器die掉所有PHP代码，发现waiting（TTFB）只要12毫秒，可以判定时PHP代码的问题
4、反复测试发现是pdo连接数据库造成waiting（TTFB）时间长
5、将pdo连接中host=localhost；更改为host=127.0.0.1；解决问题。
6、loclahost和127.0.0.1的区别
127.0.0.1无需解析，localhost还要本地DNS解析，所有127.0.0.1会更快
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