Vue官网todoMVC示例代码

//操作input元素使enter一下之后清空输入框内容

data() {//一些初始化数据
 return {
  todolists: [],
  dataStatus: ["All", "Active", "Completed"],
  dataStatusIndex: 0,
  whichShow: true,
  defaultShow: true
 }
},
addTodo(e) { //添加todo
 var val = e.value
 if (val === "") {return} //如果输入内容为空则立即返回
 this.todoLists = this.todoLists.concat({//使用concat这个api添加todo
  value: val, //输入内容
  isEditing: false, //是否在编辑状态
  isActive: false, //删除X图标是否激活
  isChecked: false //是否已完成
 })
 this.$refs.currentInput.value = "" //按下enter添加todo之后把输入框value清零
 window.localStorage.setItem("content",JSON.stringify(this.todoLists))//使用localStorage以JSON格式存储数据
},

 
 //绑定删除单条todo事件
 

deleteTodo(index) { //删除单条todo
  this.todoLists.splice(index, 1)//使用splice的api
  window.localStorage.setItem("content",JSON.stringify(todoLists)) //以JSON格式存储数据//localStorage存储数据
},

//双向绑定isChecked

 //动态绑定class该表已完成todo样式
{{list.value}}


 //绑定blur失去焦点事件

methods: {
 toEdit(obj) { //使添加的todothing可编辑
  obj.isEditing = true
 },
 
 unEdit(obj) { //使添加的todothing不可编辑
  obj.isEditing = false
 },
}

directives: { //自定义focus指令,需要一个binding参数做判断
 "todo-focus": function (el, binding) {
  if (binding.value) {
   el.focus()
  }
 }
}

 //全部已完成事件

selectAllTodos() { //设置所有todo为已完成,使用map的api通过todo的isChecked属性操作
 this.todoLists.map(todo => todo.isChecked = todo.isChecked &＃63; false : true)
}

 //times为0显示item，大于0显示items，细节注定成败
 {{times}}  item left


{{times}}  items left

computed: {
 times() { //使用计算属性计算待办todos的次数 
  let todoArr = this.todoLists
  let times = 0
  for (let i = 0; i 

 //如果待办事件次数小于总todoLists长度就显示“clear completed”
 clear completed


 //如果待办事件次数等于总todoLists长度就显示“clear completed”
 

clearTodos() { //清空已完成的todoLists，使用filter的api进行筛选
 this.todoLists = this.todoLists.filter(todo => todo.isChecked === false)
 window.localStorage.setItem("content",JSON.stringify(this.todoLists)) //以json格式存储数据
},

 
  {{item}}
 

switchStatus(index) { //通过if条件判断操作
 this.dataStatusIndex = index
 if (this.dataStatus[index] === "Active") {
  this.defaultShow = false
  this.whichShow = false
 } else if (this.dataStatus[index] === "Completed") {
  this.defaultShow = false
  this.whichShow = true
 } else if (this.dataStatus[index] === "All") {
  this.defaultShow = true
 }
},

 

  todos
  

   
   
   
   

    

     
     

      {{list.value}}
     
     
     
    
   
   

    

     {{times}} item left
    
    

     {{times}} items left
    
    

     
      {{item}}
     
    
    

     clear completed