(1)：defineProps：传入要使用的props定义自定义属性，传递过来的值具有响应式，和props一样；

(2)：defineEimts：传入要自定义的事件，emit实例去传入自定义事件的值，和$emit或context.emit一样；

父组件：

<template><initInput :index="8" @changeInit="changeInit"></initInput>
</template><script lang="ts" setup>
import initInput from './computed/initInput.vue';
const changeInit = (e: any) => {console.log(e);  // 100
}
</script>

子组件：

<template><div><el-button type="primary" @click="change">点击</el-button></div>
</template>
<script lang="ts" setup>
import { onMounted, getCurrentInstance } from 'vue';
import { useRoute, useRouter } from 'vue-router';
// data数据
let { proxy: this_ }: any = getCurrentInstance();
let route = useRoute();
let router = useRouter();
// mounted
// methods方法
let props = defineProps({index: {type: Number,default: 0}
});
let emit = defineEmits(["changeInit"]);
const change = () => {console.log(props.index);  // 8emit("changeInit", 100);
}
</script>
<style scoped  lang='scss'>
</style>