learnin-some-vue/lessons/app.js

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

var component2 = {
  template: '<span>butts</span>',
};



var app1 = new Vue({
  el: '#app1',
  components: {
    'ts-cmp': component
  }

});

var app2 = new Vue({
  el: '#app2',
  components: {
    'ts-cmp': component2
  }

});