父组件可以向子组件传参，子组件不可改变父组件数据

作者: daoqing99 | 来源:发表于2018-04-17 10:26 被阅读0次

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>ref</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <counter :count="0" @change="handleSum"></counter>
        <counter :count="0" @change="handleSum"></counter>
        <div>{{sum}}</div>
    </div>
    <script>
    var counter = {
        props: ['count'],
        data: function() {
            return {
                number: this.count,
            }
        },
        template: "<div @click='handleNumPlus'>{{number}}</div>",
        methods: {
            handleNumPlus: function() {
                this.number = this.number + 1;
                this.$emit('change', 1)
            }
        }
    };

    var vm = new Vue({
        el: '#app',
        data: {
            sum: 0
        },
        methods: {
            handleSum: function(step) {
                this.sum += step;
            }
        },
        components: {
            counter: counter
        }
    })
    </script>
</body>

</html>