vue-拼接字符串

      <!-- 弹层 -->
      <van-popup round
            v-model="filterShow"
            position="bottom"
            :style="{height: nahe,   '100%' }"
        >
         <shaixuan  :filterData="filterData" :parent="this" @comfirmParam="getFilterData" 
           :screenShow="screenShow" :selctedFilterData="listgetData"></shaixuan>
        </van-popup>


      this.nahe="calc(100% - "+Number(document.getElementById('ajaxListSort').offsetTop+50)+"px)"