Vue

HTML

<div id="app">
  <h2>Todos:</h2>
  <ol>
    <li v-for="(todo,index) in todos.data" :key="index">
    {{todo.text}}
    </li>
    <button @click="del">删除</button>
  </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: 
    {
    	data:[
      { text: "Learn JavaScript", done: false },
      { text: "Learn Vue", done: false },
    ]
    }
    
  },
  methods: {
    del(){
    this.todos.data.splice(1,1)
    /* this.$set(this.todos, 'questionDetails', this.todos.splice(1,1)) */
    	 /* this.$forceUpdate() */
    }
  }
})