前言

习惯了 vue2 的 this，而 vue3 没有 this，element 组件库也不再像以前那样复制粘贴即可，路漫漫其修远兮，慢慢积累ing。
由于无法像 vue2 一样通过 this.$refs 来获取表单DOM，所以我们需要借助 vue3 的 ref 来获取表单DOM，对此还有不明白的可先查阅 vue3 通过 ref 获取 DOM。

vue3 使用校验规则表单

<template>
	<el-form :rules="uploadFormRules" ref="uploadForm" :model="uploadFormData" label-width="70px">
	  <el-form-item label="组别ID" prop="groupId">
	    <el-input v-model="uploadFormData.groupId" placeholder="请输入组别ID"></el-input>
	  </el-form-item>
	  <el-form-item label="组别名" prop="groupName">
	    <el-input v-model="uploadFormData.groupName" placeholder="请输入组别名"></el-input>
	  </el-form-item>
	  <el-form-item label="是否显示" prop="groupStatus">
	    <el-switch v-model="uploadFormData.groupStatus" />
	  </el-form-item>
	    <el-button size="medium" @click="resetForm('uploadForm')">取 消</el-button>
	    <el-button size="medium" type="primary" @click="submitForm">确 定</el-button>
	  </el-form-item>
	</el-form>
</template>

<script lang="ts">
  import {defineComponent, ref} from 'vue';

  export default defineComponent({
    name: 'UserGroup',
    setup() {
      const uploadObj = {groupId: '', groupName: '', groupStatus: true} // 新增组别表单包含的参数
      const uploadForm = ref() // 新增组别表单 DOM
      const uploadFormData = ref({...uploadObj}) // 新增组别表单的信息
      const uploadFormRules = ref({
        groupId: [
          { required: true, message: '请输入组别ID', trigger: 'blur' }
        ],
        groupName: [
          { required: true, message: '请输入组别名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ]
      }) // 新增组别表单规则

      // 重置表单,呃，这里暂时不会像 vue2 那样通过 this.$refs[formName] 动态实现重置各个表单
      const resetForm = (formName: string) => {
        if (formName === 'uploadForm') {
          uploadForm.value.resetFields()
        }
      }
      // 提交表单
      const submitForm = () => {
        uploadForm.value.validate((valid: any) => {
          if (valid) {
            console.log('submit')
          } else {
          	console.log('error submit')
            return false
          }
        })
      }

      return {
        uploadForm,
        uploadFormData,
        uploadFormRules,
        resetForm,
        submitForm
      }
    }
  })
</script>