为什么`v = bf13ba33f40c`这个额外的查询字符串在wordpress网站url中传递?

I am working on a wordpress project. I simply installed the wordpress 4.6.1 and completed my project. But there is a problem with the url. It seems to be like http://example.com/demo/?v=bf13ba33f40c, I didn't get why ?v=bf13ba33f40c part is added to url automatically. I set the permalink but it shows no effect. Anybody please help.

Thanks!

It looks like the "geolocalize users with cache support" setting in WooCommerce. If you turn that off the extra get parameter will go away