Vue官网todoMVC示例代码(2)

<input type="checkbox" class="checkBox" 
v-model="list.isChecked">//双向绑定isChecked

<div class="content_todoList_main" 
@dblclick="toEdit(list)" //双击事件
v-show="!list.isEditing" //切换元素
:class="{deleted:list.isChecked}"> //动态绑定class该表已完成todo样式
{{list.value}}
</div>

<input type="text" class="content_todoList_main main_input" 
v-model="list.value" //双向绑定可输入value
v-show="list.isEditing" //切换元素
v-todo-focus="list.value" //自定义指令，双击之后自动focus对焦
@blur="unEdit(list)"> //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()
  }
 }
}

<span 
class="icon-down el-icon-arrow-down" //使用element库做向下箭头icon
v-show="todoLists.length>0" //通过todoLists控制是否显示向下箭头icon
@click="selectAllTodos"></span> //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 ? false : true)
}

<div class="data_times" v-show="times === 0"> //times为0显示item，大于0显示items，细节注定成败
 <span>{{times}}</span>  item left
</div>
<div class="data_times" v-show="times > 0">
<span>{{times}}</span>  items left</div>

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 < todoArr.length; i++) {
   if (todoArr[i].isChecked === false) {
    times++
   }
  }
  return times
 }
},

<div class="data_clearTodos" 
@click="clearTodos" 
v-show="times < todoLists.length"> //如果待办事件次数小于总todoLists长度就显示“clear completed”
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >clear completed</a>
</div>

<div class="data_clearTodos" 
@click="clearTodos" 
v-show="times === todoLists.length"> //如果待办事件次数等于总todoLists长度就显示“clear completed”
 <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></a>
</div>