10-Vue.js/code/2-Vue组件/8-兄弟组件间数据通信.html

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

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="./lib/vue.js"></script>
</head>

<body>
    <div id="app">
        {{msg}}<br />
        <button @click="clearEvent">清除事件：</button>
        <tom-component></tom-component>
        <jerry-component></jerry-component>
    </div>
    <script>
        // 兄弟组件之间数据通信
        // 1. 定义一个全局的 Vue 实例，担任全局事件中心
        var event_hub = new Vue();
        Vue.component("tom-component", {
            data: function() {
                return {
                    count: 0,
                };
            },
            template: `
            <div>
                TOM：{{count}}<br/>
                <button @click="handle">点击</button>
            </div>
            `,
            methods: {
                handle: function() {
                    // 触发jerry的函数
                    event_hub.$emit("jerry-event", 1);
                },
            },
            mounted: function() {
                // 监听事件
                event_hub.$on("tom-event", (val) => {
                    this.count += val;
                });
            },
        });
        Vue.component("jerry-component", {
            data: function() {
                return {
                    count: 0,
                };
            },
            template: `
      <div>
          JERRY：{{count}}<br/>
          <button @click="handle">点击</button>
      </div>
      `,
            methods: {
                handle: function() {
                    // 触发对方的事件
                    event_hub.$emit("tom-event", 2);
                },
            },
            mounted: function() {
                // 自己也创建一个
                event_hub.$on("jerry-event", (val) => {
                    this.count += val;
                });
            },
        });
        const vm = new Vue({
            el: "#app",
            data: {
                msg: "父组件信息",
            },
            methods: {
                clearEvent: function() {
                    event_hub.$off("tom-event");
                    event_hub.$off("jerry-event");
                },
            },
        });
    </script>
</body>

</html>