<html>
  <head>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
      Vue.config.devtools = true;
    </script>
  </head>
  <body>
    <div id="app">
      <p>current Id {{id}}</p>
      <p>
        <button @click="id--">prev</button>
        <button @click="id++">next</button>
      </p>
      <p v-if="loading">
        loading...
      </p>
      <div v-else>
        <p>Status: {{status}}</p>
        {{ json }}
      </div>
    </div>

    <script src="https://cdn.jsd