使用vant的地域控件追加全部选项

<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>

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
      };
    },