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                [TOC] ## 概述 注意: 1. 觸發的事件都是 App 全局級別的,跨任意組件,頁面,nvue,vue 等 使用場景 1. vue 與 nvue,nvue 與 vue 間的通訊 2. tabbar 頁面之間的通訊 3. 父頁面與多級子頁面間的通訊 格式 ``` uni.$emit(eventName,OBJECT) uni.$on(eventName,callback) uni.$once(eventName,callback) uni.$off([eventName, callback]) ``` 實例 ``` // 我的頁面 <script> export default { data() { return { val: 0 } }, onLoad() { setInterval(()=>{ uni.$emit('add', { data: 2 }) },1000) uni.$on('add', this.add) }, onUnload() { uni.$off('add'); }, methods: { comunicationOff() { uni.$off('add', this.add) }, add(e) { this.val += e.data } } } </script> ```
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