使用vant的地域控件追加全部选项

在项目中使用了vant的Area插件，需要进行全部匹配，vant本身没有实现，需要改造代码，方法如下：

<div class="site">
 <span class>起点</span>
 <van-cell v-model="start" @click="areaSelect(0)"></van-cell>
</div>
<div class="site">
 <span>终点</span>
 <van-cell v-model="end" @click="areaSelect(1)"></van-cell>
</div>
<van-popup v-model="show" position="bottom">
 <van-area :area-list="areaList" @cancel="onCancel" @confirm="onConfirm" @change="change" ref="area" />
</van-popup>

vue的methos中添加下面两个方法：

change(picker, value, index){
  if(value[0].code != 100000){

  if(index == 0){
   let addr = this.areaList;
   let areaListCode = value[0].code;
   let code1 = Object.assign({},addr.city_list,{[areaListCode]:"全部"});
   let code2 = Object.assign({},addr.county_list,{[areaListCode]:"全部"});
   this.areaList.city_list = code1;
   this.areaList.county_list = code2;
  }
  if (index == 1) {
   let addr = this.areaList;
   let areaListCode = value[1].code;
   let code = Object.assign({},addr.county_list,{[areaListCode]: "全部"});
   this.areaList.county_list = code;
  }
  }
 },
 areaSelect(type) {
  let addr = this.areaList;
  this.PickerType = type;
  this.show = true;  
  if(this.PickerType == 1 && this.endAddrInfo == "请选择"){
   this.$refs.area.reset();
  };
  let province_list = Object.assign({},addr.province_list,{100000:"全部"});
  let city_list = Object.assign({},addr.city_list,{100100:"全部"});
  let county_list = Object.assign({},addr.county_list ,{100101:"全部"});
  this.areaList={
  province_list,city_list,county_list
  };
 },

补充知识：使用vant中的Area 省市区选择和Area控件如果没有选中第三级的话就选不到当前值

今天要使用Area选择器在网上查了很多方法一直都无法让他隐藏再弹出来今天我就写下我的心得

效果图如下: