Google maps with javascript in Ionic 2
$ npm install -g ionic
$ npm install -g cordova
$ git clone https://github.com/mayrarodriguez1709/ionic2-google-maps-js
$ cd ionic2-google-maps-js
$ npm install
$ ionic state restore
you can get one in https://developers.google.com/maps/web/?hl=es
$ ionic serve
and ¡Voilá!