Vue3表单组件el-form校验规则rules属性示例详解

<template>
  <el-form :model="formData" :rules="rules" ref="form">
    <el-form-item label="用户名" prop="username">
      <el-input v-model="formData.username"></el-input>
    </el-form-item>
    <el-form-item label="邮箱" prop="email">
      <el-input v-model="formData.email"></el-input>
    </el-form-item>
    <el-form-item label="密码" prop="password">
      <el-input type="password" v-model="formData.password"></el-input>
    </el-form-item>
    <el-button type="primary" @click="submitForm">提交</el-button>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      formData: {
        username: '',
        email: '',
        password: ''
      },
      rules: {
        username: [
          { required: true, message: '用户名不能为空', trigger: 'blur' },
          { min: 3, max: 15, message: '用户名长度应在3到15个字符之间', trigger: 'blur' }
        ],
        email: [
          { required: true, message: '邮箱不能为空', trigger: 'blur' },
          { type: 'email', message: '请输入有效的邮箱地址', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '密码不能为空', trigger: 'blur' },
          { min: 6, max: 20, message: '密码长度应在6到20个字符之间', trigger: 'blur' }
        ]
      }
    };
  },
  methods: {
    submitForm() {
      this.$refs.form.validate((valid) => {
        if (valid) {
          console.log('表单提交成功');
        } else {
          console.log('表单校验失败');
          return false;
        }
      });
    }
  }
};
</script>

rules: {
  password: [
    { required: true, message: '密码不能为空', trigger: 'blur' },
    { min: 6, max: 20, message: '密码长度应在6到20个字符之间', trigger: 'blur' },
    { validator: validatePasswordStrength, trigger: 'blur' }
  ]
}

function validatePasswordStrength(rule, value, callback) {
  if (!/\d/.test(value)) {
    callback(new Error('密码必须包含至少一个数字'));
  } else if (!/[a-zA-Z]/.test(value)) {
    callback(new Error('密码必须包含至少一个字母'));
  } else {
    callback();
  }
}

<el-form ref="form" :model="form" :rules="rules" size="small" label-width="88px">
	<el-form-item label="确认密码" prop="confirmPass">
        <el-input v-model="form.confirmPass" type="password" auto-complete="on" style="width: 370px;" />
    </el-form-item>
...
</el-form>

data(){
	// 定义规则 (rule, value, callback) 
	const confirmPass = (rule, value, callback) => {
      if (value) {
        if (this.form.newPass !== value) {
          callback(new Error('两次输入的密码不一致'))
        } else {
          callback()
        }
      } else {
        callback(new Error('请再次输入密码'))
      }
    }
 ...
}

rules:{
	oldPass: [
       { required: true, message: '请输入旧密码', trigger: 'blur' }
     ],
     newPass: [
       { required: true, message: '请输入新密码', trigger: 'blur' },
       { min: 6, max: 20, message: '长度在 6 到 20 个字符', trigger: 'blur' }
     ],
	confirmPass: [
       { required: true, validator: confirmPass, trigger: 'blur' }
   ]
...
}