子組件

<template>
    <div class="top-title">
        <h1>你需要支付￥{{money}}</h1>
    </div>
</template>

<script>
    export default {
        name: "payMent",
        props: {
            money:{ 
                default: 0
            }
        }
    }
</script>

父組件

<template>
    <div class="">
        <pay-ment money="money"></pay-ment>
        <a @click='changCost'>改變支付費(fèi)用<>
    </div>
</template>

<script>
    import payMent from '../components/payMent.vue' 
    export default {
        name: "pay",
        data: {
            money: 33
        },
        components: {
            payMent 
        },
        methods:{
            changCost: function(){
                this.money = 88;  //-這里父組件值改變了，而子組件的沒(méi)有改變，還是33，沒(méi)有變成88
            }
        }
    }
</script>