The form verifies the variables bound to the V-model, and the solution to invalid verification

Serve directly

        <el-form-item label=" Type of ID card ：" key="certName" prop="certName2">
          <el-select
            size="small"
            v-model.trim="certName"
            placeholder=" Please select "
            clearable
            @change="certNameChange"
          >
            <el-option
              v-for="item in documentTypeOptions"
              :key="item.value"
              :label="item.name"
              :value="item.value"
            ></el-option>
          </el-select>
        </el-form-item>

data data

      documentCallBackList1: {
        fileType: "",
        certName: "",
        certEffectDate: "",
        certExpireDate: "",
        certId: "",
        certNo: