<template>
 <div class="hello">
  <h1>{{ msg }}</h1>
  <button v-on:click="reverse">点击</button>
  <input v-model="newtodo" v-on:keyup.enter="add">
  <ul>
   <li v-for="(todo,index) in todos">
    <span>{{todo.text}}</span>
    <button v-on:click="remove(index)">删除</button>
   </li>
  </ul>
 </div>
</template>
<script>
export default {
 name: 'HelloWorld',
 data () {
  return {
   msg: 'Welcome to Your Vue.js App',
   todos: [
    {text:'我是一开始就有的哦!'}
   ],
   newtodo: ''
  }
 },
 methods: {
  reverse: function(){
   this.msg = this.msg.split('').reverse().join('')
  },
  add: function(){
   var text = this.newtodo.trim();
   if(text){
    this.todos.push({text:text});
    this.newtodo = ''
   }
  },
  remove: function(index){
   this.todos.splice(index,1)
  }
 }
}
</script>