elementUI 循环出来的表单，怎么做表单校验？

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

<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&nbsp;</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>