First, let's introduce json. JSON means JavaScript Object Notation is a lightweight data exchange format. Easy to read and write. It is also easy to machine parse and generate. It is based on JavaScript Programming Language, Standard ECMA-262 3rd Edition - Decemb...

RT， An API, which is not bad, mainly means that you don't want to get the geographical location information of the visitor's location through JavaScript. You have referred to several online APIs, accidentally saw this API, and made a record API address: https://ip-api.com/ Support data format: xml, json，csv，newline Include data: Request to show

Problem recurrence One of the configured repositories failed (Unknown), and yum doesn’t have enough cached data to continue. At this point the only safe thing yum can do is ...

Recently, I was very impressed by Q, and I had a little trouble with Google Cloud, ubuntu16. When I used it, I suddenly found that I could not install software with yum, but apt get did not install it????? What the hell? Forget it. Solve the yum package On the centos system, an error is reported when using the yum command to install the software package:   rpmdb: Thread/process 653...