Promise.all

checkItemsBatch.vue

<script>
...
methods: {
...
    validateRowForm(form, error, rules) {
      return new Promise((resolve, reject) => {
        new schema(rules).validate(form, (errors, fields) => {
          if (fields) {
            for (let k in fields) {
              error[k] = {
                isError: true,
                message: fields[k][0].message
              };
            }
          }
          let valid = fields ? false : true;
          resolve(valid);
        });
      });
    },

    validateAllRowForm() {
      return new Promise((resolve, reject) => {
        let promises = this.data.map(row => this.validateRowForm(row.__form__, row.__error__, this.rules))
        Promise.all(promises).then(values => {
          resolve(values.every(valid => valid))
        })
      })
    },
  }
</script>