【vue3】vue3接收props以及emit的用法

技术：vue3.2.40
UI框架：arco-design 2.44.7
css技术：less 4.1.3

实现：子组件接收props以及通过emit方法传值父组件

vue3使用的组合式API，我这里使用的是defineComponent

1.父页面调用子组件

<template><div class="dataManagerMentPage"><a-table :columns="fieldColumns" :data="tableData" :scrollbar="true"><template #category="{ record }">{{ handModelType(record.category) }}</template><template #optional="{ column, record, rowIndex }"><a-button @click="handDetails(column, record, rowIndex)" type="text">详情</a-button></template></a-table><modelDetails:modalForm="modalForm"@handleCancel="handleCancel"@handleModalOk="handleModalOk"></modelDetails></div>
</template><script lang="ts">import {defineComponent,reactive,toRefs,onUnmounted,onMounted,} from 'vue';import modelDetails from './components/modelDetails.vue';export default defineComponent({name: 'DataManagerMent',components: {modelDetails,},setup() {interface IDataManagerMant {// table字段名fieldColumns: any[];// table数据源tableData: any[];modalForm: {visible: boolean;title: string;data: object;};}const dataManagerMant = () => ({modalForm: {visible: false,title: '',data: null,},// table字段名fieldColumns: [{title: '设备ID',dataIndex: 'id',ellipsis: true,tooltip: true,},{title: '设备名称',dataIndex: 'deviceName',ellipsis: true,tooltip: true,},{title: '设备序列号',dataIndex: 'deviceOuterId',ellipsis: true,tooltip: true,},{title: '设备类型',dataIndex: 'category',slotName: 'category',},{title: '厂商',dataIndex: 'manufacturer',ellipsis: true,tooltip: true,},{title: '绑定模型',dataIndex: 'relatedModelId',},{title: '创建时间',dataIndex: 'createDate',},{title: '操作',dataIndex: 'optional',slotName: 'optional',align: 'center',},],// table数据源tableData: [],});const state: IDataManagerMant = reactive(dataManagerMant());// 查看详情页function handDetails(column: any, record: any, rowIndex: any) {state.modalForm = {visible: true,title: record.id,data: record,};}// 判断设备类型function handModelType(category: string) {let name = '';switch (category) {case 'VEHICLE':name = '车辆';break;case 'VIDEO':name = '视频';break;case 'COMMON':name = '默认';break;default:name = '默认';break;}return name;}// 关闭弹窗function handleCancel() {state.modalForm = {visible: false,title: '',data: {},};}// 弹窗保存按钮事件function handleModalOk() {handleCancel();}return {...toRefs(state),handDetails,handleCancel,handleModalOk,handModelType,};},});
</script><style lang="less" scoped>.dataManagerMentPage {width: 100%;height: 100%;margin: 0;padding: 0;}
</style>

2.子组件

<template><a-modalwidth="50%":visible="modalForm.visible"@ok="handleOk"@cancel="handleCancel":title="'数据详情-' + modalForm.title"okText="保存"cancelText="取消"title-align="start":okLoading="loading"><a-spin :loading="loading" tip="正在获取数据中..."><div class="modelDetailsPage"></div></a-spin></a-modal>
</template><script lang="ts">import {defineComponent,reactive,toRefs,onUnmounted,onMounted,watch,} from 'vue';import { Message } from '@arco-design/web-vue';export default defineComponent({name: 'ModelDetails',props: {// 父级的modalForm: {visible: {type: Boolean,default: false,},title: {type: String,default: '',},},},setup(props, { emit }) {interface IDataManagerMant {loading: boolean;}const dataManagerMant = () => ({loading: false,});const state: IDataManagerMant = reactive(dataManagerMant());// 保存按钮事件function handleOk() {state.loading = true;Message.success('保存成功！');emit('handleModalOk');state.loading = false;}// 返回按钮事件function handleCancel() {emit('handleCancel');}watch(() => props.modalForm,(newV, oldV) => {if (newV.visible) {// 这里可以写处理化执行的函数方法=}});return {...toRefs(state),handleOk,handleCancel,};},});
</script>
<style lang="less" scoped>.modelDetailsPage {width: 100%;height: 100%;padding: 0 12px;}
</style>

注意点：

1.setup里如果需要接收props和使用emit，只需要带参数 setup(props, { emit })
2.setup里面只需要带emit(‘handleCancel’)，不需要带$$符号，这个符号是vue2的写法
3.watch监听的方法，放在setup里面