Vue中v-form标签里的:rules作用及定义方法

<template>
  <el-form :model="formData" :rules="rules" ref="formRef">
    <el-form-item label="用户名" prop="username">
      <el-input v-model="formData.username"></el-input>
    </el-form-item>
    <el-form-item label="密码" prop="password">
      <el-input v-model="formData.password" type="password"></el-input>
    </el-form-item>
    <el-form-item>
      <el-button @click="submitForm">提交</el-button>
    </el-form-item>
  </el-form>
</template>
<script setup>
import { ref } from 'vue';
// 定义表单数据
const formData = ref({
  username: '',
  password: ''
});
// 定义表单验证规则
const rules = ref({
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 3, max: 10, message: '用户名长度在 3 到 10 个字符之间', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    { min: 6, max: 20, message: '密码长度在 6 到 20 个字符之间', trigger: 'blur' }
  ]
});
// 定义表单引用
const formRef = ref(null);
// 提交表单方法
const submitForm = () => {
  formRef.value.validate((valid) => {
    if (valid) {
      console.log('表单验证通过，提交数据:', formData.value);
    } else {
      console.log('表单验证失败');
    }
  });
};
</script>

<template>
  <el-form :model="formData" :rules="rules" ref="formRef">
    <el-form-item label="邮箱" prop="email">
      <el-input v-model="formData.email"></el-input>
    </el-form-item>
    <el-form-item>
      <el-button @click="submitForm">提交</el-button>
    </el-form-item>
  </el-form>
</template>
<script setup>
import { ref } from 'vue';
import { validateEmail } from './utils'; // 假设这是一个自定义的邮箱验证函数
const formData = ref({
  email: ''
});
const rules = ref({
  email: [
    { required: true, message: '请输入邮箱', trigger: 'blur' },
    { validator: validateEmail, message: '请输入有效的邮箱地址', trigger: 'blur' }
  ]
});
const formRef = ref(null);
const submitForm = () => {
  formRef.value.validate((valid) => {
    if (valid) {
      console.log('表单验证通过，提交数据:', formData.value);
    } else {
      console.log('表单验证失败');
    }
  });
};
</script>