Vue3.0 父传子 子调父

父组件给子组件传参

父组件
import Children from "./components/Children.vue";
import {ref} from "vue"
<Children  :data="data" />
let data = ref("666")
子组件
const props = defineProps({
    data: {
        default: "",
        type: String
    }
})

子组件调用父组件函数

子组件

const emit = defineEmits(['fatherFun'])
调用
emit('fatherFun', '参数')

父组件
<Components @fatherFun="fatherFun"  />
function fatherFun(options){
    console.log(options)
}