<div class="main">
 <h3 class="big-title">添加任务：</h3>
 <input 
  placeholder="在此添加任务" 
  class="task-input" 
  type="text"
  v-model="things"
  @keyup.enter="addTodo"
 />
 <ul class="task-count" v-show="list.length">
  <li>
   {{unCheckedLength}}个任务未完成</li>
  <li class="action">
   <a :class="{active: visibility == 'all'}" href="#all" rel="external nofollow" >所有任务</a>
   <a :class="{active: visibility == 'unfinished'}"href="#unfinished" rel="external nofollow" >未完成任务</a>
   <a :class="{active: visibility == 'finished'}"href="#finished" rel="external nofollow" >完成任务</a>
  </li>
 </ul>
 <div class="tasks">
  <span class="no-task-tip" v-show="!list.length">还没有添加任何任务</span>
  <ul class="todo-list">
   <li class="todo" v-for="item in filteredList" :class="{completed: item.isChecked,editing:item === editItem}" >
    <div class="view">
     <div class="word">
      <input class="toggle" type="checkbox" v-model="item.isChecked" >
      <label @dblclick="editTodo(item)">{{item.title}}</label>
     </div>
     <button class="destroy" type="text" @click="deleteTodo(item)">×</button>

    </div>
    <input 
     v-focus="editItem === item" 
     class="edit" 
     type="text" 
     v-model="item.title"
     @blur="edited"
     @keyup.enter="edited"
     @keyup.esc="cancel(item)"
    />
   </li>
  </ul>
 </div>
</div>

var vm = new Vue({
 el: ".main",
 data: {
  list:list,
  things:"",
  editItem:"",
  beforeTitle:"",
  visibility:"all",
  inputId:"",
 }, 
 watch:{
  list:{
   handler:function(){
    store.save("todolist",this.list)
   },
   deep:true
  }
 },
 computed:{
  unCheckedLength(){
   return this.list.filter(function(item){
    return item.isChecked == false
   }).length
  },
  filteredList(){   
   return filter[this.visibility] ? filter[this.visibility](this.list) : list
  }
 },
 methods: {
  addTodo(ev){
   if(this.things !== ""){
    var item = {
     title:this.things,
     isChecked:false, 
    }
    this.list.push(item)
   }    
   this.things = "";
  },
  deleteTodo(item){
   var index = this.list.indexOf(item);
   this.list.splice(index,1);
  },
  editTodo(item){ 
   this.beforeTitle = item.title;
   this.editItem = item
  },
  edited(item){
   this.editItem = ""
  },
  cancel(item){
   item.title = this.beforeTitle;
   this.editItem = "";
   this.beforeTitle = ""
  }
 },
 directives:{
  "focus":{         
   update(el,binding){
    if(binding.value){
     el.focus()
    }

   }
  }
 }
});

new Vue({
 el: ".main",
 data: {
  list:list,
  things:"",
  editItem:"",
  beforeTitle:"",
  visibility:"all",
  inputId:"",
 }
}）

methods: {
   addTodo(ev){
    if(this.things !== ""){
     var item = {
      title:this.things,
      isChecked:false, 
     }
     this.list.push(item)
    }    
    this.things = "";
   },
   deleteTodo(item){
    var index = this.list.indexOf(item);
    this.list.splice(index,1);
   },
   editTodo(item){ 
    this.beforeTitle = item.title;
    this.editItem = item
   },
   edited(item){
    this.editItem = ""
   },
   cancel(item){
    item.title = this.beforeTitle;
    this.editItem = "";
    this.beforeTitle = ""
   }
 }

computed:{
  unCheckedLength(){
   return this.list.filter(function(item){
    return item.isChecked == false
   }).length
  },
  filteredList(){   
   return filter[this.visibility] ? filter[this.visibility](this.list) : list
 }
}

watch:{
  list:{
   handler:function(){
    store.save("todolist",this.list)
   },
   deep:true
  }
}

directives:{
  "focus":{         
   update(el,binding){
    if(binding.value){
     el.focus()
    }

   }
  }
}