vue 列表單選處理

<template>
    <div class="depart">
        <!-- search-->
        <div class="top-search">
            <el-form ref="formSearch" label-width="100px"   inline>
                <Row>
                    <Col span="24">
                        <el-form-item label="訂單日期：">
                            <b 
                                v-for="(item,k) in dateArr" 
                                :key="k" 
                                :class="{bgActive: (defaultDate == item)}" 
                                @click="changeForm('defaultDate',item)"
                            >{{item}}</b>
                        </el-form-item>
                    </Col>
                </Row>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                active: true,