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Pros:

• You don't have to learn any new languages if you're already a decent web developer

• It's very quick to prototype

• It's really cool and fun

• If you so wanted to, you can bypass the app store by hosting the files on a server, and utilize app cache to make things speedy. Changing your app is just changing a web page and its cache manifest file or service workers.

• Managing images for multiple devices is a lot easier with CSS and media queries than it is for an iOS xcode project and an Android project with its ldpi, hdpi, xdpi, and whatever dpi.

• Easier to create vector graphics to design spec

• Cross-platform compatibility.

• You can write mobile SPA and use it like mobile application.

Cons:

• There are a lot of mobile devices out there with varying hardware, screen sizes, and network speed

• Can be not so fast and responsive than native apps

• There are less facilities in javascript for modularization of large-scale applications than Objective-C or Java

http://ionicframework.com/docs/v2/components/#overview