记录工作中遇到的问题…
如下图：下拉框选中无法回显，输入框无法输入

排查了原因，原来是接收的formData不是响应式的

const props = defineProps({
    formData: {
        type: Object,
        default: ()=> [{
            devices:[]
        }]
    },
    })

formData将其放在模板中使用，没有响应式

<div class="form-container" v-for="(ysGsItem, index) in formData">
                <div class="sort-no">
                    序号{{ index + 1 }}
                    <el-button v-if="formData.length > 1 && !disabled" type="danger" plain
                        style="margin-left: auto;" @click="deleteYsGsItem(index)">删除</el-button>
                </div>
                <el-form :model="ysGsItem" label-position="top" :rules="rules"
                    ref="ysGsInfoRef">
                    <el-row type="flex" justify="space-between">
                        <el-col :span="7">
                            <el-form-item label="运输公司名称" prop="key1">
                                <el-select-v2
                                    v-model="ysGsItem.key1"
                                    :options="ysGsList"
                                    :props="{
                                        label: ysGsProp.label,
                                        value: ysGsProp.key
                                    }"
                                    :disabled="disabled"
                                    filterable
                                    @change="id=>ysgcChange(id, ysGsItem)"
                                    placeholder="请选择"
                                >
                                <template #default="{ item }">
                                    <span>{{ item[ysGsProp.label] }}</span>
                                </template>
                                </el-select-v2>
                            </el-form-item>
                        </el-col>
                        <el-col :span="7">
                            <el-form-item label="法定代表人" prop="key3">
                                <el-input v-model="ysGsItem.key3" placeholder=""></el-input>
                            </el-form-item>
                        </el-col>
                        <el-col :span="7">
                            <el-form-item label="联系人电话" prop="key4">
                                <el-input v-model="ysGsItem.key4" placeholder=""></el-input>
                            </el-form-item>
                        </el-col>
                    </el-row>
                </el-form>

            </div>

解决：
const formData = ref(props.formData)，用ref包装成响应式就可以啦！