一个简单的思路，不知道Laya本身是否有解决方案啊

 wxhelper.js[code]class WXHELPER {
    constructor () {
        this._isWxContext = !!window.wx
    }

    onShow (callback) {
        if (!this._isWxContext) return
        window.wx.onShow(callback)
    }

    onHide (callback) {
        if (!this._isWxContext) return
        window.wx.onHide(callback)
    }

    offShow (callback) {
        if (!this._isWxContext) return
        window.wx.offShow(callback)
    }

    offHide (callback) {
        if (!this._isWxContext) return
        window.wx.offHide(callback)
    }
}

const wxHelper = new WXHELPER()
export default wxHelper

[/code]

gameController.js

import wxHelper from 'wxhelper'
export default class welcome extends Laya.Script {
    constructor() {
        super()
    }

    onEnable() {
        wxHelper.onShow(this.resumeGame)
        wxHelper.onHide(this.pauseGame)
    }


    resumeGame () {
        console.log('resumeGame')
    }

    pauseGame () {
        console.log('pauseGame')
    }

    onDestroy () {
        wxHelper.offHide()
        wxHelper.offShow()
    }
}