<div >
  <p @click="clickSize (item, index)">{{item.name}}</p> 
  <transition name="opacityLeave">
   <div class="condition-list" v-show="isShowSize && index == i">
    <div class="size-wrap" v-if="item.RingSize">
     <p class="size" :class="{'active':item1.active}" :key="index1" v-for="(item1, index1) in item.RingSize" @click="getSize (item, item1) ">{{item1.AttrValueName}}</p>
    </div>
   </div>
  </transition>
</div>

data() {
 return {
  isShowSize: false,
  i: -1
 };
 },
//實現點擊哪個下拉框顯示
  clickSize (item, index) {
  this.i = index;
  this.isShowSize = !this.isShowSize;
 },
//實現選取下拉值
 getSize (item, item1) {
  this.item.name = item1.AttrValueName;
  this.isShowSize = !this.isShowSize;
 },

<Select <span style="color: rgb(255, 0, 0);">v-bind:disabled="isAble" </span>clearable v-model="dataAgentEntity.ID" style="width:240px"> 
  <Option v-for="item in dataAgent" :value="item.ID" :key="item.ID">{{ item.name }}</Option> 
 </Select> 

export default { 
 data(){ 
  return{ 
   isAble: false,//select下拉框是否可用 
  } 
 } 

 methods:{ 
   Test(){ 
   var vm = this; 
    if (vm.alertType == '郵件') { 
    vm.isAble = true; //不可用 
   } 
    
   } 
}