Why is the click event not working on a vue v2 component?

Question

Vue.js

setting the key attribute in v-for doesn't change anything
https://jsfiddle.net/morskaya_ulitochka/jy3pamct/

Answer 1

var vm = new Vue({
    el: "#txt",

new Vue({ el: '#txt' })

What for?
Remove the second one, place the registration of the global component before the first one.