Vue

HTML

<div id="app">
  <h2>Todos:</h2>
  <ol>
    <li v-for="todo in todos">
      <label>
        <input type="checkbox"
          disabled
          v-on:change="toggle(todo)"
          v-bind:checked="todo.done">

        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
          {{ todo.half }}
          {{ todo.timeout }}
        </span>
      </label>
    </li>
  </ol>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: "Learn JavaScript", half: false, done: false, timeout: Math.random()*5000 },
      { text: "Learn Vue", half: false, done: false, timeout: Math.random()*5000 },
      { text: "Play around in JSFiddle", half: false, done: false, timeout: Math.random()*5000 },
      { text: "Build something awesome", half: false, done: false, timeout: Math.random()*5000 }
    ]
  },
  methods: {
    delayedHalf(todo) {
    	return new Promise((resolve) => {
      	setTimeout(()=>{
          todo.half = true; 
          resolve();
        }, todo.timeout);
      })
    },
    delayedDone(todo) {
    	return new Promise((resolve) => {
      	setTimeout(()=>{
          todo.done = true; 
          resolve();
        }, todo.timeout);
      })
    }
  },
  async mounted() {
  	await Promise.all(this.todos.map(async todo => {
      await this.delayedHalf(todo, false);
      return this.delayedDone(todo, true);
      }));
    alert('all done');
  }
})