小さなプログラムでモジュール化をエレガントに実装する方法についての簡単な分析?

// 使用基于app.js的相对路径来引入文件，这样就避免了写很多"../"
const app = getApp()
const upload = app.require("lib/upload")

<!-- 文章列表项 -->
<import src=&#39;./avatar&#39; />
<template name="post-item">
<view class="margin padding-sm bg-white radius flex shadow " style="position: relative;height: 350rpx;border-radius: 10rpx;">
        <!-- 背景蒙版 -->
        <view style="position: absolute;top: 0;left: 0;width: 100%;height: 100%;border-radius: 10rpx;">
                <image style="filter:blur(2px) grayscale(80%) opacity(80%)" lazy-load="{{true}}" src="{{imgList[0]}}" mode="aspectFill"></image>
        </view>
        <view style="position: absolute;top: 0;left: 0;width: 100%;height: 100%;background-color: rgba(30, 30, 30, 0.8);border-radius: 10rpx;">
        </view>

        <view style="z-index: 10;width: 100%;" class="text-white">
                <!-- 文章标题 -->
                <view class="text-xl  ">
                        <text class="cu-tag margin-right-sm bg-color radius">{{topic}}</text>
                        <text class="text-bold">{{title}}</text>
                </view>
                <!-- 文章内容 -->
                <view class="margin-top-xs text-sm text-cut">{{content}}</view>

                <view class="flex align-end justify-between margin-top">
                        <!-- 文章图片 -->
                        <view class="flex align-center">
                                <view class="margin-xs" style="width: 120rpx;height: 120rpx;" wx:for="{{imgList}}" wx:key="{{index}}" wx:if="{{index < 3}}">
                                        <image class="radius" src="{{item}}" mode="aspectFill"></image>
                                </view>
                        </view>

                        <!-- 浏览量-点赞数 -->
                        <view class="bg-color flex align-center text-white text-sm radius" style="padding: 4px 12px;">
                                <view class="cuIcon-attention "></view>
                                <view class="margin-left-xs">{{viewNum||0}}</view>
                                <view class="cuIcon-like margin-left"></view>
                                <view class="margin-left-xs">{{favorNum||0}}</view>
                        </view>
                </view>

                <!-- 发布时间 -->
                <view class="margin-top-xs flex align-center text-sm text-gray justify-between padding-lr-xs">
                        <view class="flex align-center">
                                <template is="avatar" data="{{size:45,avatarUrl:user.avatarUrl}}" />
                                <view class="margin-left-xs">{{user.nickName}}</view>
                        </view>

                        <view>{{createTime}}</view>
                </view>
        </view>

</view>
</template>

<!-- 某个页面 -->
<import src=&#39;../../template/post-item&#39; />

<template data="{{...item}}" is="post-item" />

// lib/upload.js
// 上传方法
module.exports = async function upload(path) {
	return await wx.cloud.uploadFile({
		cloudPath: new Date().getTime() + path.substring(path.lastIndexOf(".")),
		filePath: path,
	})
}

// pages/form/form.js
const app = getApp()
const upload = app.require("lib/upload")
Page({
async submit() {
    wx.showLoading({
            mask: true,
            title: "发布中"
    })
    const imgList = []
    for (let img of this.data.form.imgList) {
            const uploadRes = await upload(img)
            imgList.push(uploadRes.fileID)
    }
    // ...其他业务代码
    }
})

// mixin.js
// 保存原生的 Page 函数
const originPage = Page
// 定义小程序内置的属性/方法
const prop = ['data', 'properties', 'options']
const methods = ['onLoad', 'onReady', 'onShow', 'onHide', 'onUnload', 'onPullDownRefresh', 'onReachBottom', 'onShareAppMessage', 'onPageScroll', 'onTabItemTap']

Page = (options) => {
  if (Array.isArray(options.mixins)) {
    const mixins = options.mixins
    delete options.mixins
    mixins.forEach((mixin) => {
      for (let [key, value] of Object.entries(mixin)) {
        if (prop.includes(key)) {
          // 混入属性
          options[key] = {
            ...value,
            ...options[key]
          }
        } else if (methods.includes(key)) {
          // 混入原生方法
          const originFunc = options[key]
          options[key] = function (...args) {
            value.call(this, ...args)
            return originFunc && originFunc.call(this, ...args)
          }
        } else {
          // 混入普通方法
          options = {
            ...mixin,
            ...options
          }
        }
      }
    })
  }
  originPage(options)
}

// app.js
require("./mixins.js")
App({
// ...其他代码
})

// pages/form/form.js
const app = getApp()
const upload = app.require("lib/upload")
const to = app.require("lib/awaitTo")
const db = wx.cloud.database()
Page({
	mixins: [require("./mixins/topic")],
	data: {
		user: wx.getStorageSync('user'),
		form: {
			title: "",
			topic: "",
			content: "",
			imgList: []
		}
	},
	chooseImg() {
		wx.chooseImage({
			count: 9 - this.data.form.imgList.length,
			sizeType: ['original'], //可以指定是原图还是压缩图，默认二者都有
			sourceType: ['album', 'camera'], //从相册选择
			success: (res) => {
				res.tempFilePaths = res.tempFilePaths
				if (this.data.form.imgList.length != 0) {
					this.setData({ "form.imgList": this.data.form.imgList.concat(res.tempFilePaths) })
				} else {
					this.setData({ "form.imgList": res.tempFilePaths })
				}
			}
		});
	},
	async delImg(e) {
		const index = e.currentTarget.dataset.index
		const temp = this.data.form.imgList
		temp.splice(index, 1)
		this.setData({ "form.imgList": temp })
	}
})

// // pages/form/mixin/topic.js
const db = wx.cloud.database()
module.exports =  {
    data:{
        topic:{
            flag:false,
            list:[]
        },
    },
    onLoad(options) {
		this.getTopic()
    },
    async getTopic(){
		const res = await db.collection("topic").get()
		this.setData({"topic.list":res.data})
	},
	
	clearTopic(){
		this.setData({"form.topic":""})
	},
	toggleTopic(e){
        console.log(e.currentTarget.dataset)
		const flag = e.currentTarget.dataset.flag
		this.setData({"topic.flag":flag})
	},
}