推荐文章：vue+ElementUI 表单嵌套表格逐行校验（新增、编辑）的完美解决方案

文章里写的很详细，就不多介绍。这里写了一个简单的demo，主要标准一下注意点。

<template>
    <div>
      <el-button type="primary" @click="visible=true">新增</el-button>
       <el-dialog title="新增" v-model="visible" width="50%" :close-on-click-modal="false" @close="closeDialog">
           <el-form ref="form" :model="form"  :rules="rules">
                <el-table :data="form.tableData" style="width: 100%;" height="300px" border ref="tableDemo">
                    <el-table-column type="index" width="55" label="序号" align="center"></el-table-column>
                    <el-table-column label="姓名" prop="name" min-width="120"  align="center">
                       <template #default="scope">
                           <el-form-item :prop="'tableData.'+scope.$index+'.name'" :rules='rules.name'>
                            <el-input v-model="scope.row.name"></el-input>
                        </el-form-item>
                       </template>
                    </el-table-column>
                    <el-table-column label="地址" prop="address" min-width="120"  align="center">
                        <template #default="scope">
                           <el-form-item :prop="'tableData.'+scope.$index+'.address'" :rules='rules.address'>
                            <el-input v-model="scope.row.address"></el-input>
                        </el-form-item>
                       </template>
                    </el-table-column>
                     <el-table-column label="操作"  min-width="120"  align="center">
                         <template #default="scope">
                             <div>
                                 <el-button type="text" @click="addItem(scope.row,scope.$index)">添加</el-button>
                                 <el-button type="text" @click="removeItem(scope.$index)">删除</el-button>
                             </div>
                         </template>
                     </el-table-column>
                </el-table>
           </el-form>
           <template #footer>
               <div>
                   <el-button type="primary" @click="save">保存</el-button> 
                   <el-button type="primary" @click="clear">清空</el-button> 
               </div>
           </template> 
       </el-dialog>
    </div>
</template>

<script>
import { ElMessage } from 'element-plus'
export default {
    data() {
        return {
          form:{
               tableData:[
                   {
                       name:undefined,
                       address:undefined
                   }
               ]
          },
          visible:false,
          //表单校验规则
           rules: {
                name: [
                    { required: true, message: '请输入名称', trigger: 'blur' },
                ],
                address:[
                     { required: true, message: '请输入住址', trigger: 'blur' },
                ]
           }
        };
    },
    mounted() {

    },
    methods: {
     //关闭弹窗
     closeDialog(){
         this.visible=false
         this.$refs.form.resetFields()
     },
     //保存
     save(){
       this.$refs.form.validate((valid) => {
          if (valid) {
            alert('submit!');
          } else {
            console.log('error submit!!');
            return false;
          }
        });
     },
     //清空
     clear(){
        this.$refs.form.resetFields()
     },
     //新增行
     addItem(item,index){
        let itemClone=JSON.parse(JSON.stringify(item))
        this.form.tableData.push(itemClone)
     },
     //删除行
     removeItem(index){
      if(this.form.tableData.length>1){
           this.form.tableData.splice(index,1);
      }else{
         ElMessage.warning({
            message: '不允许全部删除',
            type: 'warning'
          });
      }
     }
    }
};
</script>

<style scoped lang="scss">

</style>

注：

• 表格要嵌套在表单里

 <el-form ref="form" :model="form"  :rules="rules">
       <el-table :data="form.tableData" style="width: 100%;" height="300px" border ref="tableDemo">
       </el-table>
 </el-form>

• 表格绑定的数据
  绑定的数据必须是表单对象里的一个属性

form:{
      tableData:[
          {
              name:undefined,
              address:undefined
          }
      ]
 },

• 表单项的属性必须是动态值

<el-table-column label="姓名" prop="name" min-width="120"  align="center">
   <template #default="scope">
       <el-form-item :prop="'tableData.'+scope.$index+'.name'" :rules='rules.name'>
        <el-input v-model="scope.row.name"></el-input>
    </el-form-item>
   </template>
</el-table-column>

:prop="'tableData.'+scope.$index+'.name'" ：表格绑定的属性+表格的序号+对应的字段属性，注意后面的点别忘了，本质上是对象，例如：tableData.0.name 和tableData.0.address

• 表单整体上绑定校验规则，每一个表单项上也绑定对应的校验。表单项上不绑定校验不生效。例如去掉地址的校验

<el-table-column label="姓名" prop="name" min-width="120"  align="center">
    <template #default="scope">
        <el-form-item :prop="'tableData.'+scope.$index+'.name'" :rules='rules.name'>
         <el-input v-model="scope.row.name"></el-input>
     </el-form-item>
    </template>
 </el-table-column>
 <el-table-column label="地址" prop="address" min-width="120"  align="center">
     <template #default="scope">
        <el-form-item :prop="'tableData.'+scope.$index+'.address'">
         <el-input v-model="scope.row.address"></el-input>
     </el-form-item>
    </template>
 </el-table-column>

• 行的新增

 <el-button type="text" @click="addItem(scope.row,scope.$index)">添加</el-button>
 //新增行
 addItem(item,index){
    let itemClone=JSON.parse(JSON.stringify(item))
    this.form.tableData.push(itemClone)
 },