P23.vue3设置生命周期，props，context，provide-inject

设置生命周期App.vuesetuppropsApp.vue

Content.vuecontextApp.vueContent.vuescript>import{onUpdated,toRefs,ref}from"vue";exportdefault{data(){return{a:10,};},props:{message:{type:String,default:'Hellocooldog',},},setup(props,context){constcounter=ref(20)functionsendeParent(){context.emit('injectCounter',counter.value)}console.log(context.attrs);返回{sendeParent}},组件:{},方法:{},名称:"Content"}provideApp.vueContent.vueApp.vueContent.vue