SOURCE

new Vue({
  el: "#app",
  data: {
    todos: [{
      text: "Learn JavaScript",
      done: false
    },
    {
      text: "Learn Vue",
      done: false
    },
    {
      text: "Play around in JSFiddle",
      done: true
    },
    {
      text: "Build something awesome",
      done: true
    }]
  },
  methods: {
    toggle: function(todo) {
      todo.done = !todo.done
    }
  }
})

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js">
</script>
<div id="app">
  <h2>
    Todos:
  </h2>
  <ol>
    <li v-for="todo in todos">
      <label>
        <input type="checkbox" v-on:change="toggle(todo)" v-bind:checked="todo.done">
        <del v-if="todo.done">
          {{ todo.text }}
        </del>
        <span v-else>
          {{ todo.text }}
        </span>
      </label>
    </li>
  </ol>
</div>

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);
}