Get post count and TotalPages in wp rest API v2

今天在处理文章数据加载时候出现无法判断最大页码，于是google到的一些答案。

The WP Rest API sends the total count(found_posts) property from WP_Query. in a header called.

FOR POSTS:you can make a call to posts endpoint of the REST API

The value for posts count is returned in the header as. Below is a sample response from the hosted demo

这里具体使用实例：

参考文档：

wordpress官方文档（英语能力不行，当时没看懂~~）： https://developer.wordpress.org/rest-api/using-the-rest-api/pagination/

stackoverflow： https://stackoverflow.com/questions/48503413/wordpress-rest-api-get-total-post-count