<el-select
                v-model="tableData.searchData.billCode"
                placeholder="请选择"
                clearable
                filterable
                @blur="selectMethod"
              >
                <el-option value="BALANCE" label="全平衡整机"></el-option>
                <el-option value="UN_BALANCE" label="非全平衡整机"></el-option>
                <el-option value="ASSEMBLY" label="总成件"></el-option>
              </el-select>

function selectMethod(e) {
  if (e.target.value !== '') {
    tableData.searchData.billCode = e.target.value; 
  }
}