<div id="app">
    <my-cmp></my-cmp>
    <hr>
    <my-cmp></my-cmp>
</div>

Vue.component ('my-cmp', {
  data: function() {
    return {
      status: 'Critical'
    };
  },
  template: '<p>Status: {{ status }} (<button @click="changeStatus">Change</button>)</p>',
    methods: {
        changeStatus: function() {
            this.status: 'other';
        };
    }
});

new Vue ({
  el: '#app'
});