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Props用于父组件向子组件传值

定义类型

// 定义一个接口,用来限制Teacher的属性
export interface Teacher {name: string;age: number;gender: string;
}export type teacherList = Teacher[];// 一个自定义类型
export type Teachers = Array<Teacher>;

父组件

<script lang="ts" setup name="App">import Person from './components/Person.vue'import { reactive, ref } from 'vue'import { type teacherList } from '@/types';let personList = reactive<teacherList>([{ name: '张三', age: 20, gender: '男' },    { name: '李四', age: 25, gender: '男' },{ name: '王五', age: 30, gender: '男' }])
</script><template><div class="container"><!-- <Person a="哈哈" :list="personList"/> -->// 不传list,让子组件显示默认数据<Person a="哈哈" /></div>
</template><style scoped>.container {display: flex;height: 100vh; /* 使容器占满整个屏幕高度 */}
</style>

子组件

<script lang="ts" setup name="Person">import { type teacherList } from '@/types';// let x = defineProps(['a', 'list'])// 要先声明才能打印// console.log(x.a)// 只接受// defineProps(['a', 'list'])// 接受+限制// defineProps<{list:teacherList}>()// 接受+限制+限制必要性+默认值withDefaults(defineProps<{list?:teacherList}>(), {// 默认值,这里的默认值也得是teacherList类型，而且是个函数list:() => [{name:'张三',age:20, gender:'男'},{name:'李四',age:25, gender:'女'}]})</script><template><div class="person"><!-- <h1>{{ a }}</h1> --><ul><li v-for="item in list" :key="item.name">{{ item.name }} - {{ item.age }}</li></ul></div></template><style scoped>
</style>