项目场景

注册使用Element-Ul中的表单，Mess消息不能正常显示
预计效果
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Part1

问题1

给按钮添加Mess消息提示,有反应，但不是预期反应，就没看到页面上方的提示框，就是滚动条一直上下动
后来发现是提示框都在下面出现了

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<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref } from 'vue'

import { userRegisterService } from '@/api/user.js'
import { ElMessage } from 'element-plus' 
const register = async () => {
  await form.value.validate()
  await userRegisterService(formModel.value)
  ElMessage.success('注册成功')
  //   alert('注册成功')
  isRegister.value = false
}

const test = () => {
  ElMessage.error('Oops, this is a error message.')
  console.log('hhhhhhhhh');
}
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册相关表单 -->

      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <button @click="test">hhh</button>
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>

原因分析1

查看官网，由于本项目使用的都是自动导入，文件中已配置好
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但是在写 ElMessage.error('Oops, this is a error message.')vscode自动导包
import { ElMessage } from 'element-plus'，变成了手动导入，
所以
代码失效的原因可能是两种导入方式冲突

解决方案

删掉import { ElMessage } from 'element-plus'

Part 2

问题2

给按钮添加Mess消息提示,但是毫无反应，没有提示框，没有打印hhhhhh,点击就刷新

解决方案2

法一

经过多次尝试，发现把这个 <button @click="test">hhh</button>放到el-form外边就可以了
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法2

<button @click="test">hhh</button>还是在el-form里面，但是用了el-button

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全部代码：

<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref } from 'vue'
const isRegister = ref(true)
const form = ref()
// 整个的用于提交的form数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 整个表单的校验规则
// 上下要同名
const rules = ref({
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是5-10位', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是6-15位的非空字符',
      trigger: 'blur'
    }
  ],
  repassword: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是6-15位的非空字符',
      trigger: 'blur'
    },
    {
      validator: (rules, value, callback) => {
        // 判断value 和 当前from 中收集的password 是否一致
        if (value !== formModel.value.password) {
          callback(new Error('两次输入的密码不一致'))
        } else {
          // 校验成功
          // 也要写callback
          callback()
        }
      },
      trigger: 'blur'
    }
  ]
})
import { userRegisterService } from '@/api/user.js'
// import { ElMessage } from 'element-plus'
const register = async () => {
  await form.value.validate()
  await userRegisterService(formModel.value)
  ElMessage.success('注册成功')
  //   alert('注册成功')
  isRegister.value = false
}

const test = () => {
  ElMessage.error('Oops, this is a error message.')
  console.log('hhhhhhhhh')

  //   ElMessage({
  //     showClose: true,
  //     message: 'Congrats, this is a success message.',
  //     type: 'success'
  //   })
}
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册相关表单 -->
      <!-- <button @click="test">hhh</button> -->

      <el-form
        :model="formModel"
        :rules="rules"
        ref="form"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <!-- <el-button @click="test">hhh</el-button> -->
        <button @click="test">hhh</button>
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
            v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="register"
            class="button"
            type="primary"
            auto-insert-space
          >
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>

      <!-- 登陆相关表单 -->
      <el-form ref="form" size="large" autocomplete="off" v-else>
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item>
          <el-input :prefix-icon="User" placeholder="请输入用户名"></el-input>
        </el-form-item>
        <el-form-item>
          <el-input
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button class="button" type="primary" auto-insert-space
            >登录</el-button
          >
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background:
      url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>