数据结构如下：
diversionParamList:
{
length: null,
positionNumber: null,
value: null,
}
思路：可根据 index 动态绑定 :props 属性值，校验规则写在:rules
javascript
<div class="config-item" v-for="(item, index) in form.diversionParamList" :key="index">
<el-form-item :label="`分流配置${index + 1}`" :prop="`diversionParamList.${index}.positionNumber`"
:rules="{ required: true, message: '请输入位置', trigger: 'blur' }">
<span class="config-item-text">位置：</span>
<el-input-number size="small" style="width: 100px" v-model="item.positionNumber" :min="0"></el-input-number>
</el-form-item>
<el-form-item :prop="`diversionParamList.${index}.length`"
:rules="{ required: true, message: '请输入长度', trigger: 'blur' }">
<span class="config-item-text">长度：</span>
<el-input-number size="small" style="width: 100px" v-model="item.length" :min="1"></el-input-number>
</el-form-item>
<el-form-item :prop="`diversionParamList.${index}.value`"
:rules="[{ required: true, message: '请输入值', trigger: 'blur' }, { pattern: /^[0-9A-Fa-f]+$/, message: '必须是1-9或16进制字符:a-f或A-F' }]">
<span class="config-item-text">值：</span>
<el-input :maxlength="item.length * 2" v-model="item.value" placeholder="请输入值" style="width: 150px">
<template #prefix>0x </template>
</el-input>
</el-form-item>
<div class="button-group">
<el-button v-if="index === form.diversionParamList.length - 1" type="primary" size="small"
@click="addFormConfig()">新增
</el-button>
<el-button v-if="index !== 0" type="danger" size="small" @click="delFormConfig(index)">删除
</el-button>
</div>
</div>