Vue.js实现一个todo-list的上移下移删除功能

<div><input v-model="newItem" v-on:keyup.enter="addNew"></div> 
<div class="box-center"> 
 <ul class="box-list"> 
  <li v-for="item ,index in items" v-bind:class="{finished:item.isfinished}"  

  v-on:mouseover="moveBtn(item)" v-on:mouseout="leaveBtn(item)"> 
  <span v-on:click="toggleFinished(item)" v-bind:class="{bgYellow:item.isBgyellow}">{{item.label}}</span> 
  <span class="list-btn" v-show="item.isShow"> 
   <button v-on:click="moveUp(index,item)">上移</button> 
   <button v-on:click="moveDown(index,item)">下移</button> 
   <button v-on:click="deleteBtn(index)">删除</button> 
  </span> 
 </li> 
</ul>  
t;/div> 

const STORAGE_KEY = 'todos-vuejs' 
export default { 
 fetch () { 
  return JSON.parse(window.localStorage.getItem( 
   STORAGE_KEY) || '[]') 
 }, 
 save (items) { 
  window.localStorage.setItem(STORAGE_KEY,JSON.stringify( 
   items)) 
 } 
} 
----App.vue---- 
<span style="font-size:14px;"><script> 
import Store from './store' 
export default { 
 data: function() { 
  return { 
   title: 'A simple todo-list', 
   items: Store.fetch(), 
   newItem: '', 
   msg:'点击按钮',  
   isShow: false, 
   isBlock: true, 
   isBgyellow: false, 
   leftPx:0, 
   Px:0 
  } 
 }, 
 watch: { 
  items: { 
   handler: function(items) { 
    Store.save(items) 
   }, 
   deep: true 
  } 
 }, 
 methods: { 
  toggleFinished: function(item) { 
   item.isfinished = !item.isfinished 
  }, 
  show:function ($event) { 
   $event.cancelBubble=true; 
   this.isBlock = false; 
   this.Px = ($event.clientY); 
   this.leftPx = ($event.clientX); 
  }, 
  s:function(event){ 
    this.isBlock = true; 
  }, 
  moveBtn:function(item) { 
   // console.log(item.label) 
   item.isShow = true; 
  }, 
  leaveBtn:function(item) { 
   item.isShow = false; 
  }, 
  addNew: function() { 
   //非空才可以添加 
   if(this.newItem!=''){ 
    this.items.push({ 
     label: this.newItem, 
     isfinished: false 
    })     
   } 
   this.newItem = ''; 
  }, 
  moveUp:function(index,item) { 
   //在上一项插入该项 
   this.items.splice(index-1,0,(this.items[index])); 
   //删除后一项 
   this.items.splice(index+1,1); 
   item.isShow = false; 
   if(index == 0) { 
    alert("到顶啦！"); 
   } 
  }, 
  moveDown:function(index,item) { 
   //在下一项插入该项 
   this.items.splice(index+2,0,(this.items[index])); 
   // 删除前一项 
   this.items.splice(index,1); 
   item.isShow = false; 
   if(index == this.items.length-1) { 
    alert("已经是一项啦！"); 
   } 
  }, 
  deleteBtn:function(index) { 
   this.items.splice(index,1); 
  } 
 }, 
} 
</script></span><span style="font-size: 18px;"> 
</span>