CustomValidator仅调用一次

const validationRules = {
  // ...其他规则
  customField: [
    { validator: customValidator, trigger: 'blur' },
    { validator: customValidator, trigger: 'change' }
  ]
};

<template>
  <form @submit.prevent="submitForm">
    <input v-model="formData.customField" />
    <button type="submit">Submit</button>
  </form>
</template>

<script>
export default {
  data() {
    return {
      formData: {
        customField: ''
      }
    };
  },
  methods: {
    customValidator(rule, value, callback) {
      // 自定义验证逻辑
      if (value.length < 5) {
        callback(new Error('至少5个字符'));
      } else {
        callback();
      }
    },
    submitForm() {
      this.$refs.form.validate(valid => {
        if (valid) {
          alert('提交成功!');
        } else {
          alert('表单验证失败!');
          return false;
        }
      });
    }
  }
};
</script>