After sending the cordova ajax post method it is working fine on browser but when u tested it on mobile then issue occured and you are unable to post or get request from server
The solution of this issue is you have to install cordova whitelist plugin and the command of this plugin is below.
cordova plugin add cordova-plugin-whitelist cordova prepare
run the above two command and after that run the below command.
cordova run android
now u can test on mobile, it will working fine.now you are good to go.