微信小程序页面通信

1.新建一个js页面 event.js,里面放三个调用函数,并把这三个函数暴露出去

function     on(event, fn, ctx) {
        if (typeof fn != "function") {
            console.error('fn must be a function')
            return
        }

        this._stores = this._stores || {}

            ; (this._stores[event] = this._stores[event] || []).push({ cb: fn, ctx: ctx })
    }
    
function     emit(event) {
        this._stores = this._stores || {}
        var store = this._stores[event], args
        if (store) {
            store = store.slice(0)
            args = [].slice.call(arguments, 1)
            for (var i = 0, len = store.length; i < len; i++) {
                store[i].cb.apply(store[i].ctx, args)
            }
        }
    }
function     off(event, fn) {
        this._stores = this._stores || {}
        // all
        if (!arguments.length) {
            this._stores = {}
            return
        }
        // specific event
        var store = this._stores[event]
        if (!store) return
        // remove all handlers
        if (arguments.length === 1) {
            delete this._stores[event]
            return
        }
        // remove specific handler
        var cb
        for (var i = 0, len = store.length; i < len; i++) {
            cb = store[i].cb
            if (cb === fn) {
                store.splice(i, 1)
                break
            }
        }
        return
    }



module.exports = { 
    on: on,
    emit: emit,
    off: off
    } 

2.app.js中引用这个js文件

const Event = require('/pages/event')

App({
    event: Event,

3.主页面注册监听

    onLoad() {
        app.event.on('afterPaySuccess', this.afterPaySuccess, this)

    },
    afterPaySuccess: function (orderId) {
        // 如果index为1输出orderid的Value
                if(orderId.index===1){
                    console.log("输出1"+orderId.value )
                    
                }else{
                    console.log("输出不是1" )
                }
    },

4.副页面发送数据,主页面收到数据

var data1 = [0xAE, 5, 9, 0x07]
        var mydata = {
            index: 1,
            value: data1
        }
        app.event.emit('afterPaySuccess', mydata)

看网上大神的日志,不喜勿喷