$parent

baseSon.vue

<template><div style="background-color: #999"><h2>儿子金钱:{{ sonMoney }}</h2><button @click="giveFatherMoney(100)">给父亲100</button><button @click="subFatherMoney(5)">拿走父亲5块钱</button></div>
</template><script>
export default {name: "baseSon",props: ["fatherMoney"],data() {return {sonMoney: 200,};},methods: {//   giveFatherMoney(money) {//     this.$parent.fatherMoney += money;//     this.sonMoney -= money;//   },giveFatherMoney (money) {this.$parent.changeFatherMoney(money)},subFatherMoney (money) {this.$parent.fatherMoney -= money}},
};
</script><style></style>

App.vue

<template><div class="app">父亲的钱：{{ fatherMoney }}<baseSon></baseSon><baseDau></baseDau></div>
</template><script>
import baseSon from './components/baseSon.vue';
import baseDau from './components/baseDau.vue';
export default {components:{baseSon,baseDau},data(){return {fatherMoney:10000}},methods:{changeFatherMoney(money){this.fatherMoney += money}}
}</script><style></style>

childern 不好用，所以建议$ref

ref

App.vue

<template><div class="app">父亲的钱：{{ fatherMoney }}<button @click="getSonMoney(50)">父亲拿走儿的50元</button><button @click="giveSonMoney(100)">父亲给儿的100元</button><baseSon ref="baseSonRef" ></baseSon></div>
</template><script>
import baseSon from './components/baseSon.vue';export default {components:{baseSon},data(){return {fatherMoney:10000}},methods:{changeFatherMoney(money){this.fatherMoney += money},getSonMoney(money){console.log('getSonMoney');// this.$children.sonMoney -= moneythis.$refs.baseSonRef.sonMoney -= money// console.log('this.$children.sonMoney', this.$children.sonMoney);},giveSonMoney(money){this.$refs.baseSonRef.changeSonMoney(money)// this.$children.changeSonMoney(money)}}
}</script><style></style>

baseSon.vue

<template><div style="background-color: #999"><h2>儿子金钱:{{ sonMoney }}</h2><button @click="giveFatherMoney(100)">给父亲100</button><button @click="subFatherMoney(5)">拿走父亲5块钱</button></div>
</template><script>
export default {name: "baseSon",props: ["fatherMoney"],data() {return {sonMoney: 200,};},methods: {//   giveFatherMoney(money) {//     this.$parent.fatherMoney += money;//     this.sonMoney -= money;//   },giveFatherMoney(money) {this.$parent.changeFatherMoney(money)},subFatherMoney(money) {this.$parent.fatherMoney -= money},changeSonMoney(money) {this.sonMoney += money}},
};
</script><style></style>