i want to less and full button to post

i want javascript code to do like this
when you notice inside blog post is button (orange) when you click on it is the post becomes large
how to do this ? can you help me ?

A lot of the development these day is with the internet solution. This has rapid development to applications that can use towards desk. The use of a framework such as javascript code client enables to create page that are responsive as desktop much to deploy. No to install separate client on machine. this with javascript code techniques your application work to a mobile phone.
Hope it helps,
Mark Stanton