How to deal with Vue.js animation?

Question

Vue.js

Wrote a small transition https://jsfiddle.net/q5eud1yx/11/ , tell me how to make it so that when you click on any button, for example, a transition was applied to the text "Slide 2" ?

Answer 1

Working variant: https://jsfiddle.net/wostex/mxgfc5yu/1/
Slides must be inside a `transition` block and each element must have a unique `key`