標題描述看起來有些復雜，有vue，Element，又有表單驗證，還有v-for循環？是不是有點亂？不過我相信開發中遇到過此問題的同學，一看就明白我說的意思了。

首先Element組件有一套完善的表單驗證方法，官方文檔寫的也很清楚：Element表單驗證API，正常按照官方文檔添加rules規則，需要驗證的表單項設置prop，然后提交表單時通過form的validate方法驗證表單項就可以了。

然鵝問題來了，如果表單項里有通過v-for動態生成的表單項，如何設置驗證呢？這個官方文檔并沒有明確的說法，我們通過查找解決方案和實際驗證，總結出來解決方法如下。

首先是循環表單項沒有加驗證之前的代碼：

<template> <div class="content-body">  <el-form ref="form" :model="form" :rules="rules" label-width="120px">   <el-row :gutter="10">    <el-col :span="12" :offset="0">     <el-form-item label="套餐名稱：" prop="activityName" id="activityName">      <el-input v-model="form.activityName"></el-input>     </el-form-item>    </el-col>   </el-row>   <el-row :gutter="10">    <el-col :span="12">     <el-form-item label="狀態：">      <el-radio v-model="form.status" label="1">上線</el-radio>      <el-radio v-model="form.status" label="0">下線</el-radio>     </el-form-item>    </el-col>   </el-row>   <el-row :gutter="10">    <el-col :span="2" style="width:120px;">     <div class="sub-title">梯度設置：</div>    </el-col>    <el-col :span="20">      <el-row :gutter="10" v-for="(item,index) in form.productGroup" :key="index">       <el-col :span="6">        <el-form-item label="商品數量:">         <el-input v-model="item.num" type="number" size="small" style="width:80px;"></el-input>        </el-form-item>       </el-col>       <el-col :span="6">        <el-form-item label="優惠價格:">          <el-input v-model="item.price" type="number" size="small" style="width:80px;"></el-input>        </el-form-item>       </el-col>       <el-col :span="4">        <i class="el-icon-remove-outline" @click="deleteLadder(index)"></i>          <i class="el-icon-circle-plus-outline" @click="addLadder" v-if="index==0"></i>       </el-col>      </el-row>    </el-col>   </el-row>   <el-form-item size="medium" class="div-submit">    <el-button @click="resetForm('form')">取消</el-button>    <el-button type="primary" @click="submitForm('form')">提交</el-button>   </el-form-item>  </el-form> </div></template><script>/* eslint-disable */export default { data() {  return {   form: {    activityName: '',    status: '1',    productGroup: [{num:"",price:""}]   },   rules: {    activityName: [     { required: true, message: '請輸入套餐名稱', trigger: 'blur' }    ]   }  } }, methods: {  deleteLadder(index)  {   if(this.form.productGroup.length>1){    this.form.productGroup.splice(index,1);   }  },  addLadder()  {   this.form.productGroup.push({num:"",price:""});  },  submitForm(formName)  {   console.log("activityName...",this.form.activityName);   this.$refs[formName].validate((valid,obj) => {    if (valid) {     this.submitFormAction();    } else {     this.$message.error("驗證不通過");    }   });  },  submitFormAction()  {   this.$message.success("提交成功");  },  resetForm(formName)  {   this.$refs[formName].resetFields();   this.form.productGroup = [{num:"",price:""}];  } }}</script><style>.el-form-item { margin-bottom: 20px;}</style>