<template>
 <div id="app">
 <h1 v-html = "title"></h1>
 <input v-model="newItem" v-on:keyup.enter="addNew" ></input>
 <ul>
  <li v-for="item in items" v-bind:class="{finished:item.isFinished}" v-on:click="toggleFinish(item)">{{item.label}}</li>
 </ul>
 </div>
</template>

<script>
import Store from './store'
export default {
 data:function(){
 return {
  title:"This Is A Todolist",
  items:Store.fetch(),
  newItem:""
 }
 },
 watch:{
 items:{
  handler:function(items){
  Store.save(items)
  },
  deep:true
 }
 },
 methods:{
 toggleFinish:function(item){
  item.isFinished = !item.isFinished
 },
 addNew:function(){
  this.items.push({
  label:this.newItem,
  "isFinished":false 
  })
  this.newItem=""
 }
 }
}
</script>

<style>
.finished{
 text-decoration:underline;
}
li{
 list-style:none;
 font-size:1.6em;
 margin-top:10px;
}
#app {
 font-family: 'Avenir', Helvetica, Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 text-align: center;
 color: #2c3e50;
 margin-top: 60px;
}
input{
 width:230px;
 height:40px;
 border-radius:20px;
 padding: 0.4em 0.35em;
 border:3px solid #CFCFCF;
 font-size: 1.55em;
}
</style>

const STORAGE_KEY='todos-vuejs' 
export default {
 fetch:function(){
  return JSON.parse(window.localStorage.getItem(STORAGE_KEY)||'[]');
 },
 save:function(items){
  window.localStorage.setItem(STORAGE_KEY,JSON.stringify(items))
 }
}
 

export default {
 name: 'hello',
 data () {
 return {
  msg: 'Welcome to Your Vue.js App'
 }
 }
}

//demo1.js
export const str = 'hello world'
export function f(a){ return a+1}
对应的导入方式：

//demo2.js
import { str, f } from 'demo1' //也可以分开写两次，导入的时候带花括号

//demo1.js
export default const str = 'hello world'
对应的导入方式：

//demo2.js
import str from 'demo1' //导入的时候没有花括号

<template>
 <div id="app">
 <h1 v-html = "title"></h1>
 <ul>
  <li v-for="item in items" v-bind:class="{finished:item.isFinished}">{{item.label}}</li>
 </ul>
 </div>
</template>

<script>
import Hello from './components/Hello'

export default {
 data:function(){
 return {
  title:"this is a todolist",
  items:[
  {
   label:"coding",
   "isFinished":false
  },
  {
   label:"walking",
   "isFinished":true
  }
  ]
 }
 }
}
</script>

<style>
.finished{
 text-decoration:underline;
}
#app {
 font-family: 'Avenir', Helvetica, Arial, sans-serif;
 -webkit-font-smoothing: antialiased;
 -moz-osx-font-smoothing: grayscale;
 text-align: center;
 color: #2c3e50;
 margin-top: 60px;
}
</style>

 methods:{
 toggleFinish:function(item){
  item.isFinished = !item.isFinished
 }
 }

<input v-model="newItem" v-on:keyup.enter="addNew" ></input>

newItem:""

//addNew:function(){
// alert(this.newItem)
// this.newItem=""   //添加后加输入框清空
//}

addNew:function(){
 this.items.push({
 label:this.newItem,
 "isFinished":false 
 })
 this.newItem=""
}

const STORAGE_KEY='todos-vuejs' 
export default {
 fetch:function(){
  return JSON.parse(window.localStorage.getItem(STORAGE_KEY)||'[]');
 },
 save:function(items){
  window.localStorage.setItem(STORAGE_KEY,JSON.stringify(items))
 }
}

import Store from './store'

 watch:{
 items:{
  handler:function(val,oldVal){
  console.log(val,oldVal)
  },
  deep:true
 }
 },

 watch:{
 items:{
  handler:function(items){
  Store.save(items)
  },
  deep:true
 }
 },

<script>
import Store from './store'
export default {
 data:function(){
 return {
  title:"<span>?</span>this is a todolist",
  items:Store.fetch(),
  newItem:""
 }
 },
 watch:{
 items:{
  handler:function(items){
  Store.save(items)
  },
  deep:true
 }
 },
 methods:{
 toggleFinish:function(item){
  item.isFinished = !item.isFinished
 },
 addNew:function(){
  this.items.push({
  label:this.newItem,
  "isFinished":false 
  })
  this.newItem=""
 }
 }
}
</script>