learnin-some-vue/lessons/app.js

Vue.component('ts-cmp', {
  data() {
    return {status: 'Critical'};
  },
  template: '<p> Server status {{ status }}  <button @click="changeStatus">XXX</button></p>',
  methods: {
    changeStatus(){
      this.status = 'Normal';
    }
  }
});

var app = new Vue({
  el: '#app',

});