<el-row style="height: 10vh; display: flex; justify-content: center; align-items: center;">
	<!-- 上一步按钮，触发父组件事件，将 active 设置为 0 -->
	<el-button type="primary" @click="goPreviousStep">上一步</el-button>
	<el-button type="primary" @click="goNextStep">下一步</el-button>
</el-row>

// 上一步的逻辑：将 active 设置为 0
const goPreviousStep = () => {
	emit('update-active', 0); // 通知父组件更新 active 的值为 0
};

<div v-if="active === 1">
	<New_Msg_BatchSelect active="active" @update-active="updateActive" />
</div>        

// 更新 active 的方法
const updateActive = (newActive) => {
    active.value = newActive;

    if (active.value === 1) {
        title.value = "批量挑選";
    }
    if (active.value === 2) {
        title.value = "個別挑選";
    }            
};