如何使用一个代码库在线和离线访问HTML5 / JS应用程序中的数据库？

I'm working on an HTML/JavaScript GUI application that will run on mobile devices (using Cordova) and also as a hosted web page that's accessible from a desktop web browser. I want to give the option to read and store data in a local offline database (SQL database most likely), as well as the option to connect to a web server and read/update data from the server as well.I'm working on an HTML/JavaScript GUI applicati