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自定义一个校验规则js

validator.js

//验证邮箱
export var reg_email = (rule, value, callback) => {
  const reg = /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
  if (!value) {
    callback(new Error('请输入邮箱'));
  } else {
    let check = reg.test(value);
    if (!check) {
      callback(new Error('邮箱格式错误'))
    }else{
      return true,
      callback()
    }
  }
}
//验证密码
export var reg_password = (rule, value, callback) => {
  const reg = /^(?![a-zA-Z]+$)(?![0-9]+$)[A-Za-z0-9]{8,18}$/;
  if(!value){
    callback(new Error('请输入密码'));
  }else{
    let check = reg.test(value);
    if (!check) {
      callback(new Error('密码格式错误'))
    }else{
      callback()
    }
  }
}

在表单页面引入校验规则，并使用:rulse="rules"绑定

1）导入需要的验证规则

import {
    reg_email,
    reg_password
  } from '../../js/validator.js'

2）使用 :rules="rules" 绑定一个 rules 对象

<el-form label-position="right" :model="loginForm" :rules="rules" ref="loginForm" label-width="0px">...</el-form>

3）对需要验证的表单项添加prop属性

<el-form-item prop="userAccount">
    <el-input v-model="loginForm.userAccount" placeholder="请输入邮箱" prefix-icon="fa fa-user-circle-o" clearable/>
</el-form-item>

4）在rules中配置验证

rules: {
    userAccount: [{
        required: true,
        validator: reg_email,
        trigger: 'blur',
    }]
    ...
}

5）在methods中判断校验结果

this.$refs.loginForm.validate()
    .then(res => {...}) //校验通过执行
    .catch(error => {...}) //校验未通过执行

下面是login.vue完整代码
login.vue

<template>
  <div class="div-login">
    <el-form label-position="right" :model="loginForm" :rules="rules" ref="loginForm" label-width="0px">
      <el-form-item class="form-item-title">
        <span class="span-title">用户登录</span>
      </el-form-item>
      <el-form-item prop="userAccount">
        <el-input v-model="loginForm.userAccount" placeholder="请输入邮箱" prefix-icon="fa fa-user-circle-o" clearable/>
      </el-form-item>
      <el-form-item prop="userPassword">
        <el-input v-model="loginForm.userPassword" placeholder="请输入密码" prefix-icon="fa fa-lock" show-password/>
      </el-form-item>
        <el-button type="primary" @click="submitLogin" :loading="loadingBtn">登 录</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
  import {
    reg_email,
    reg_password
  } from '../../js/validator.js'

  export default {
    name: "Login",
    data() {
      return {
        loadingBtn: false,
        rules: {
          userAccount: [{
            required: true,
            validator: reg_email,
            trigger: 'blur',
          }],
          userPassword: [{
            required: true,
            validator: reg_password,
            trigger: 'blur'
          }]
        },
        loginForm: {
          userAccount: '',
          userPassword: ''
        }
      }
    },
    mounted() {
      var that = this;
    },
    methods: {
      submitLogin() {
          this.loadingBtn = true;
          this.$refs.loginForm.validate() //判断表单验证是否通过，验证通过执行.then()，否则执行.catch()
            .then(res => {
              if (this.loginForm.userAccount == 'admin@qq.com' && this.loginForm.userPassword == 'abcd1998') {
                setTimeout(() => {
                  this.$message({
                    type: 'success',
                    message: '登录成功'
                  });
                  this.loadingBtn = false;
                }, 500);
              } else {
                setTimeout(() => {
                  this.$message({
                    type: 'error',
                    message: '登录失败'
                  });
                  this.loadingBtn = false;
                }, 500);
              }
            })
            .catch(error => {
              setTimeout(() => {
                this.$message({
                  type: 'error',
                  message: '验证失败'
                });
                this.loadingBtn = false;
              }, 500);
            })
        }
      }

    },
    watch: {
      'verifyCode': function() {
        this.isVerifyCode = this.GVerifyCode.validate(this.verifyCode);
        console.log(this.isVerifyCode)
      },
    }
  }
</script>
<style>
</style>