作者：wwayne 原文：基于Proxy的小程序状态管理 Fundebug经授权转载，版权归原作者所有。 微信小程序的市场在进一步的扩大，而背后的技术社区仍在摸索着最好的实践方案。我在帮助Nike，沃尔玛以及一些创业公司开发小程序后，依旧认为使用小程序原生框架是一个更高效，稳定的选择，而使用原生框架唯独缺少一个好的状态管理库，如果不引入状态管理则会让我们在模块化，项目结构以及单元测试上都有些捉襟见肘。 目前相对比较稳健的做法是针对redux或者mobx做一个adaptor应用到小程序中，但这样需要自己想办法打包引入外部库，还要想怎么去写这个adaptor，总显得有些麻烦。于是我迸发出一个想法去写一个专用于小程序的状态管理库，它使用起来足够简单并且可以通过小程序自己的npm机制安装。 目前我已经用这个开源库开发了两个电商小程序，在提高我开发效率的同时亦保证了程序的性能，所以接下来我想谈谈这背后的理念以启发更多开发者尝试新的解决方案。 基于Proxy的状态管理实现 Proxy在小程序中已经得到了足够好的支持，目前并没有发现在任何iPhone或者Android上不能使用Proxy的情况。而基于Proxy的状态管理其实也就是订阅监听的模式，一方面监听数据的变化，另一方面将这些变化传达给订阅的小程序页面。 举一个比较常见的例子，当一个用户从自己的主页进入用户编辑页面，然后更改了自己的用户名点击保存后，用户主页和用户编辑页上的用户名这时候都应该被更新。这背后的程序逻辑则是：更新这个行为将触发Proxy去通知状态管理库，然后状态管理库负责检查此时还在页面栈中的所有页面，更新订阅了用户名这个数据的页面，如下图： [图片] Part1: 监听数据变化 监听数据变化其实就是监听各个Store的属性变化，实现上就是在各个Store前面加了一层Proxy，用更直观的图片来表示就是这样： [图片] 当一个Store被观察以后，它的属性就都变成了Proxy实例，当这个属性值是Object或者Array的时候，它内部的值也会被包装成Proxy实例，这样无论多深层的数据变动都能被监听到。 而在Proxy的后面，Store的属性其实是被另一套数据(紫色部分)所维护，这套数据不负责监听，它就是纯数据，针对属性的任何变动最后都会应用到这套数据上来，它的作用是维护和返回最新的数据。 实现细节： https://github.com/wwayne/min… Part2: 页面数据绑定 因为小程序每个页面的js都是向Page中传递一个对象，这就让我们有机会包装这个对象，从而实现： 进入页面后，将页面保存在页面栈中 将来自状态管理库的数据映射到这个页面的data上来 页面退出时，将页面从页面栈中移除 实现细节： https://github.com/wwayne/min… Part3： 页面订阅更新 当数据被监听到变化后，我们需要依次做两件事，先是找到所有存储在页面栈里的页面，然后根据各个页面订阅的数据来检查变化，如果有变化就通知这些页面，从而让它们去触发setData更新页面。 实现细节：https://github.com/wwayne/min… 使用状态管理的例子 有了状态管理库，现在我们就来实现一开始举例的更新用户信息的操作，我们的文件路径如下： [代码]stores/ user.js pages/ userEdit/ index.js index.wxml [代码] 1. 首先我们创建一个Store保存用户的信息，并且监听它的变化： [代码]// stores/user.js import { observe } from 'minii' Class UserStore { constructor () { this.name = 'bob' } changeName (name) { this.name = name } } export default observe(new UserStore(), 'user') [代码] 2. 接着在我们的小程序页面订阅Store的信息 [代码]// pages/userEdit/index.js import { mapToData } from 'minii' import userStore from '../../stores/user' const connect = mapToData(state => (({ myName: state.user.name })) Page(connect({ updateNameToJames () { userStore. changeName('james') } })) [代码] 3. 完成，现在可以在页面中使用和更新数据了 [代码]// pages/userEdit/index.wxml <text>{{ myName }}</text> <button bindtap="updateNameToJames">update name to James</button> [代码] 最后 小程序因为有体积的限制，所以我希望在代码量上也尽量做到轻量和便捷，所以目前这个状态管理库并没有太多很复杂的功能，在小程序打包后所占用的体积也不到1kb，颇有点够用就好的意思。 我也已经用它开发了两款小程序，在经历了一段时间的用户使用后，我也更有信心说这个方案在小程序中是可行的。如果你有任何想法和建议，都欢迎告诉我。 项目Github: https://github.com/wwayne/minii 关于作者 Hi, 我是wwayne，是一名居住在上海的独立软件工程师，我正在开发我的新产品 talk-to-kim, 你可以在Github 或者专栏 一个人写代码找到我

- 需求的场景描述（希望解决的问题） slot算是小程序框架中最能提高开发效率的功能之一了，但相较现有成熟框架，仍有不足，例如： 1.当没有为插槽提供内容时，无法设置默认内容 2.无法将组件内的数据传递给插槽，无法配合for使用 - 希望提供的能力 slot允许设置默认内容 <slot name="before">     <text>默认内容<text> </slot> slot允许传递数据 <view wx:for="{{list}}">     <slot data="{{item}}"></slot> </view>

- 当前 Bug 的表现（可附上截图） 组件，注意slot位置在 [图片] 引用之后插入slot [图片] 渲染后的页面，变成了同级元素，而不是`button-list`子元素. 而且填充slot的元素没有引用button.wxss的样式。需要在引用页面在写一遍。很鸡肋 [图片] - 预期表现 - 复现路径 普通编译即可 - 提供一个最简复现 Demo 已提供

作为一个前端开发者来说，还做了这么多年，一直想做一套属于自己的ui框架。 前期也做了很多准备，虽然是移动跟pc的，小程序的代码虽然跟它们有所不一样，但是很多都是大同小异。这次想借这个小程序，完完全全的整理出来。定期的发布，就是为了更好的去监督自己。 先简单的介绍下我的小程序： 以下是我小程序的目录 [图片] 样式我是用stylus写的，里面也封装了各种方法。目前我的想法是通过配置，及方法去更换。 [图片] [图片] 首页 [图片] Button [图片] Form [图片] List [图片] Tab(scroll) [图片] Tag [图片] 小程序入口： [图片]

登陆和授权是小程序开发会遇到的第一个问题，这里把相关业务逻辑、工具代码抽取出来，展示我们如何引入的一些包使得原生微信小程序内也可以使用 async/await、fetch、localStorage、状态管理、GraphQL 等等特性，希望对大家有所帮助。 前端 目录结构 [代码]├── app.js ├── app.json ├── app.wxss ├── common │ └── api │ └── index.js ├── config.js ├── pages │ └── index │ ├── api │ │ └── index.js │ ├── img │ │ ├── btn.png │ │ └── bg.jpg │ ├── index.js │ ├── index.json │ ├── index.wxml │ └── index.wxss ├── project.config.json ├── store │ ├── action.js │ └── index.js ├── utils │ └── index.js └── vendor ├── event-emitter.js ├── fetch.js ├── fetchql.js ├── http.js ├── promisify.js ├── regenerator.js ├── storage.js └── store.js [代码] 业务代码 app.js [代码]import store from './store/index' const { loginInfo } = store.state App({ store, onLaunch() { // 打开小程序即登陆，无需用户授权可获得 openID if(!loginInfo) store.dispatch('login') }, }) [代码] store/index.js [代码]import Store from '../vendor/store' import localStorage from '../vendor/storage' import actions from './action' const loginInfo = localStorage.getItem('loginInfo') export default new Store({ state: { // 在全局状态中维护登陆信息 loginInfo, }, actions, }) [代码] store/action.js [代码]import regeneratorRuntime from '../vendor/regenerator'; import wx from '../vendor/promisify'; import localStorage from '../vendor/storage' import api from '../common/api/index'; export default { async login({ state }, payload) { const { code } = await wx.loginAsync(); const { authSetting } = await wx.getSettingAsync() // 如果用户曾授权，直接可以拿到 encryptedData const { encryptedData, iv } = authSetting['scope.userInfo'] ? await wx.getUserInfoAsync({ withCredentials: true }) : {}; // 如果用户未曾授权，也可以拿到 openID const { token, userInfo } = await api.login({ code, encryptedData, iv }); // 为接口统一配置 Token getApp().gql.requestObject.headers['Authorization'] = `Bearer ${token}`; // 本地缓存登陆信息 localStorage.setItem('loginInfo', { token, userInfo } ) return { loginInfo: { token, userInfo } } } } [代码] common/api/index.js [代码]import regeneratorRuntime from '../../vendor/regenerator.js' export default { /** * 登录接口 * 如果只有 code，只返回 token，如果有 encryptedData, iv，同时返回用户的昵称和头像 * @param {*} param0 */ async login({ code, encryptedData, iv }) { const query = `query login($code: String!, $encryptedData: String, $iv: String){ login(code:$code, encryptedData:$encryptedData, iv:$iv, appid:$appid){ token userInfo { nickName avatarUrl } } }` const { login: { token, userInfo } } = await getApp().query({ query, variables: { code, encryptedData, iv } }) return { token, userInfo } }, } [代码] pages/index/index.js [代码]import regeneratorRuntime from '../../vendor/regenerator.js' const app = getApp() Page({ data: {}, onLoad(options) { // 将用户登录信息注入到当前页面的 data 中，并且当数据在全局范围内被更新时，都会自动刷新本页面 app.store.mapState(['loginInfo'], this) }, async login({ detail: { errMsg } }) { if (errMsg === 'getUserInfo:fail auth deny') return app.store.dispatch('login') // 继续处理业务 }, }) [代码] pages/index/index.wxml [代码]<view class="container"> <form report-submit="true" bindsubmit="saveFormId"> <button form-type="submit" open-type="getUserInfo" bindgetuserinfo="login">登录</button> </form> </view> [代码] 工具代码 事件处理 vendor/event-emitter.js [代码]const id_Identifier = '__id__'; function randomId() { return Math.random().toString(36).substr(2, 16); } function findIndexById(id) { return this.findIndex(item => item[id_Identifier] === id); } export default class EventEmitter { constructor() { this.events = {} } /** * listen on a event * @param event * @param listener */ on(event, listener) { let { events } = this; let container = events[event] || []; let id = randomId(); let index; listener[id_Identifier] = id; container.push(listener); return () => { index = findIndexById.call(container, id); index >= 0 && container.splice(index, 1); } }; /** * remove all listen of an event * @param event */ off (event) { this.events[event] = []; }; /** * clear all event listen */ clear () { this.events = {}; }; /** * listen on a event once, if it been trigger, it will cancel the listner * @param event * @param listener */ once (event, listener) { let { events } = this; let container = events[event] || []; let id = randomId(); let index; let callback = () => { index = findIndexById.call(container, id); index >= 0 && container.splice(index, 1); listener.apply(this, arguments); }; callback[id_Identifier] = id; container.push(callback); }; /** * emit event */ emit () { const { events } = this; const argv = [].slice.call(arguments); const event = argv.shift(); ((events['*'] || []).concat(events[event] || [])).map(listener => self.emitting(event, argv, listener)); }; /** * define emitting * @param event * @param dataArray * @param listener */ emitting (event, dataArray, listener) { listener.apply(this, dataArray); }; } [代码] 封装 wx.request() 接口 vendor/http.js [代码]import EventEmitter from './event-emitter.js'; const DEFAULT_CONFIG = { maxConcurrent: 10, timeout: 0, header: {}, dataType: 'json' }; class Http extends EventEmitter { constructor(config = DEFAULT_CONFIG) { super(); this.config = config; this.ctx = wx; this.queue = []; this.runningTask = 0; this.maxConcurrent = DEFAULT_CONFIG.maxConcurrent; this.maxConcurrent = config.maxConcurrent; this.requestInterceptor = () => true; this.responseInterceptor = () => true; } create(config = DEFAULT_CONFIG) { return new Http(config); } next() { const queue = this.queue; if (!queue.length || this.runningTask >= this.maxConcurrent) return; const entity = queue.shift(); const config = entity.config; const { requestInterceptor, responseInterceptor } = this; if (requestInterceptor.call(this, config) !== true) { let response = { data: null, errMsg: `Request Interceptor: Request can\'t pass the Interceptor`, statusCode: 0, header: {} }; entity.reject(response); return; } this.emit('request', config); this.runningTask = this.runningTask + 1; let timer = null; let aborted = false; let finished = false; const callBack = { success: (res) => { if (aborted) return; finished = true; timer && clearTimeout(timer); entity.response = res; this.emit('success', config, res); responseInterceptor.call(this, config, res) !== true ? entity.reject(res) : entity.resolve(res); }, fail: (res) => { if (aborted) return; finished = true; timer && clearTimeout(timer); entity.response = res; this.emit('fail', config, res); responseInterceptor.call(this, config, res) !== true ? entity.reject(res) : entity.resolve(res); }, complete: () => { if (aborted) return; this.emit('complete', config, entity.response); this.next(); this.runningTask = this.runningTask - 1; } }; const requestConfig = Object.assign(config, callBack); const task = this.ctx.request(requestConfig); if (this.config.timeout > 0) { timer = setTimeout(() => { if (!finished) { aborted = true; task && task.abort(); this.next(); } }, this.config.timeout); } } request(method, url, data, header, dataType = 'json') { const config = { method, url, data, header: { ...header, ...this.config.header }, dataType: dataType || this.config.dataType }; return new Promise((resolve, reject) => { const entity = { config, resolve, reject, response: null }; this.queue.push(entity); this.next(); }); } head(url, data, header, dataType) { return this.request('HEAD', url, data, header, dataType); } options(url, data, header, dataType) { return this.request('OPTIONS', url, data, header, dataType); } get(url, data, header, dataType) { return this.request('GET', url, data, header, dataType); } post(url, data, header, dataType) { return this.request('POST', url, data, header, dataType); } put(url, data, header, dataType) { return this.request('PUT', url, data, header, dataType); } ['delete'](url, data, header, dataType) { return this.request('DELETE', url, data, header, dataType); } trace(url, data, header, dataType) { return this.request('TRACE', url, data, header, dataType); } connect(url, data, header, dataType) { return this.request('CONNECT', url, data, header, dataType); } setRequestInterceptor(interceptor) { this.requestInterceptor = interceptor; return this; } setResponseInterceptor(interceptor) { this.responseInterceptor = interceptor; return this; } clean() { this.queue = []; } } export default new Http(); [代码] 兼容 fetch 标准 vendor/fetch.js [代码]import http from './http'; const httpClient = http.create({ maxConcurrent: 10, timeout: 0, header: {}, dataType: 'json' }); function generateResponse(res) { let header = res.header || {}; let config = res.config || {}; return { ok: ((res.statusCode / 200) | 0) === 1, // 200-299 status: res.statusCode, statusText: res.errMsg, url: config.url, clone: () => generateResponse(res), text: () => Promise.resolve( typeof res.data === 'string' ? res.data : JSON.stringify(res.data) ), json: () => { if (typeof res.data === 'object') return Promise.resolve(res.data); let json = {}; try { json = JSON.parse(res.data); } catch (err) { console.error(err); } return json; }, blob: () => Promise.resolve(new Blob([res.data])), headers: { keys: () => Object.keys(header), entries: () => { let all = []; for (let key in header) { if (header.hasOwnProperty(key)) { all.push([key, header[key]]); } } return all; }, get: n => header[n.toLowerCase()], has: n => n.toLowerCase() in header } }; } export default (typeof fetch === 'function' ? fetch.bind() : function(url, options) { options = options || {}; return httpClient .request(options.method || 'get', url, options.body, options.headers) .then(res => Promise.resolve(generateResponse(res))) .catch(res => Promise.reject(generateResponse(res))); }); [代码] GraphQL客户端 vendor/fetchql.js [代码]import fetch from './fetch'; // https://github.com/gucheen/fetchql /** Class to realize fetch interceptors */ class FetchInterceptor { constructor() { this.interceptors = []; /* global fetch */ this.fetch = (...args) => this.interceptorWrapper(fetch, ...args); } /** * add new interceptors * @param {(Object|Object[])} interceptors */ addInterceptors(interceptors) { const removeIndex = []; if (Array.isArray(interceptors)) { interceptors.map((interceptor) => { removeIndex.push(this.interceptors.length); return this.interceptors.push(interceptor); }); } else if (interceptors instanceof Object) { removeIndex.push(this.interceptors.length); this.interceptors.push(interceptors); } this.updateInterceptors(); return () => this.removeInterceptors(removeIndex); } /** * remove interceptors by indexes * @param {number[]} indexes */ removeInterceptors(indexes) { if (Array.isArray(indexes)) { indexes.map(index => this.interceptors.splice(index, 1)); this.updateInterceptors(); } } /** * @private */ updateInterceptors() { this.reversedInterceptors = this.interceptors .reduce((array, interceptor) => [interceptor].concat(array), []); } /** * remove all interceptors */ clearInterceptors() { this.interceptors = []; this.updateInterceptors(); } /** * @private */ interceptorWrapper(fetch, ...args) { let promise = Promise.resolve(args); this.reversedInterceptors.forEach(({ request, requestError }) => { if (request || requestError) { promise = promise.then(() => request(...args), requestError); } }); promise = promise.then(() => fetch(...args)); this.reversedInterceptors.forEach(({ response, responseError }) => { if (response || responseError) { promise = promise.then(response, responseError); } }); return promise; } } /** * GraphQL client with fetch api. * @extends FetchInterceptor */ class FetchQL extends FetchInterceptor { /** * Create a FetchQL instance. * @param {Object} options * @param {String} options.url - the server address of GraphQL * @param {(Object|Object[])=} options.interceptors * @param {{}=} options.headers - request headers * @param {FetchQL~requestQueueChanged=} options.onStart - callback function of a new request queue * @param {FetchQL~requestQueueChanged=} options.onEnd - callback function of request queue finished * @param {Boolean=} options.omitEmptyVariables - remove null props(null or '') from the variables * @param {Object=} options.requestOptions - addition options to fetch request(refer to fetch api) */ constructor({ url, interceptors, headers, onStart, onEnd, omitEmptyVariables = false, requestOptions = {}, }) { super(); this.requestObject = Object.assign( {}, { method: 'POST', headers: Object.assign({}, { Accept: 'application/json', 'Content-Type': 'application/json', }, headers), credentials: 'same-origin', }, requestOptions, ); this.url = url; this.omitEmptyVariables = omitEmptyVariables; // marker for request queue this.requestQueueLength = 0; // using for caching enums' type this.EnumMap = {}; this.callbacks = { onStart, onEnd, }; this.addInterceptors(interceptors); } /** * operate a query * @param {Object} options * @param {String} options.operationName * @param {String} options.query * @param {Object=} options.variables * @param {Object=} options.opts - addition options(will not be passed to server) * @param {Boolean=} options.opts.omitEmptyVariables - remove null props(null or '') from the variables * @param {Object=} options.requestOptions - addition options to fetch request(refer to fetch api) * @returns {Promise} * @memberOf FetchQL */ query({ operationName, query, variables, opts = {}, requestOptions = {}, }) { const options = Object.assign({}, this.requestObject, requestOptions); let vars; if (this.omitEmptyVariables || opts.omitEmptyVariables) { vars = this.doOmitEmptyVariables(variables); } else { vars = variables; } const body = { operationName, query, variables: vars, }; options.body = JSON.stringify(body); this.onStart(); return this.fetch(this.url, options) .then((res) => { if (res.ok) { return res.json(); } // return an custom error stack if request error return { errors: [{ message: res.statusText, stack: res, }], }; }) .then(({ data, errors }) => ( new Promise((resolve, reject) => { this.onEnd(); // if data in response is 'null' if (!data) { return reject(errors || [{}]); } // if all properties of data is 'null' const allDataKeyEmpty = Object.keys(data).every(key => !data[key]); if (allDataKeyEmpty) { return reject(errors); } return resolve({ data, errors }); }) )); } /** * get current server address * @returns {String} * @memberOf FetchQL */ getUrl() { return this.url; } /** * setting a new server address * @param {String} url * @memberOf FetchQL */ setUrl(url) { this.url = url; } /** * get information of enum type * @param {String[]} EnumNameList - array of enums' name * @returns {Promise} * @memberOf FetchQL */ getEnumTypes(EnumNameList) { const fullData = {}; // check cache status const unCachedEnumList = EnumNameList.filter((element) => { if (this.EnumMap[element]) { // enum has been cached fullData[element] = this.EnumMap[element]; return false; } return true; }); // immediately return the data if all enums have been cached if (!unCachedEnumList.length) { return new Promise((resolve) => { resolve({ data: fullData }); }); } // build query string for uncached enums const EnumTypeQuery = unCachedEnumList.map(type => ( `${type}: __type(name: "${type}") { ...EnumFragment }` )); const query = ` query { ${EnumTypeQuery.join('\n')} } fragment EnumFragment on __Type { kind description enumValues { name description } }`; const options = Object.assign({}, this.requestObject); options.body = JSON.stringify({ query }); this.onStart(); return this.fetch(this.url, options) .then((res) => { if (res.ok) { return res.json(); } // return an custom error stack if request error return { errors: [{ message: res.statusText, stack: res, }], }; }) .then(({ data, errors }) => ( new Promise((resolve, reject) => { this.onEnd(); // if data in response is 'null' and have any errors if (!data) { return reject(errors || [{ message: 'Do not get any data.' }]); } // if all properties of data is 'null' const allDataKeyEmpty = Object.keys(data).every(key => !data[key]); if (allDataKeyEmpty && errors && errors.length) { return reject(errors); } // merge enums' data const passData = Object.assign(fullData, data); // cache new enums' data Object.keys(data).map((key) => { this.EnumMap[key] = data[key]; return key; }); return resolve({ data: passData, errors }); }) )); } /** * calling on a request starting * if the request belong to a new queue, call the 'onStart' method */ onStart() { this.requestQueueLength++; if (this.requestQueueLength > 1 || !this.callbacks.onStart) { return; } this.callbacks.onStart(this.requestQueueLength); } /** * calling on a request ending * if current queue finished, calling the 'onEnd' method */ onEnd() { this.requestQueueLength--; if (this.requestQueueLength || !this.callbacks.onEnd) { return; } this.callbacks.onEnd(this.requestQueueLength); } /** * Callback of requests queue changes.(e.g. new queue or queue finished) * @callback FetchQL~requestQueueChanged * @param {number} queueLength - length of current request queue */ /** * remove empty props(null or '') from object * @param {Object} input * @returns {Object} * @memberOf FetchQL * @private */ doOmitEmptyVariables(input) { const nonEmptyObj = {}; Object.keys(input).map(key => { const value = input[key]; if ((typeof value === 'string' && value.length === 0) || value === null || value === undefined) { return key; } else if (value instanceof Object) { nonEmptyObj[key] = this.doOmitEmptyVariables(value); } else { nonEmptyObj[key] = value; } return key; }); return nonEmptyObj; } } export default FetchQL; [代码] 将wx的异步接口封装成Promise vendor/promisify.js [代码]function promisify(wx) { let wxx = { ...wx }; for (let attr in wxx) { if (!wxx.hasOwnProperty(attr) || typeof wxx[attr] != 'function') continue; // skip over the sync method if (/sync$/i.test(attr)) continue; wxx[attr + 'Async'] = function asyncFunction(argv = {}) { return new Promise(function (resolve, reject) { wxx[attr].call(wxx, { ...argv, ...{ success: res => resolve(res), fail: err => reject(err) } }); }); }; } return wxx; } export default promisify(typeof wx === 'object' ? wx : {}); [代码] localstorage vendor/storage.js [代码]class Storage { constructor(wx) { this.wx = wx; } static get timestamp() { return new Date() / 1000; } static __isExpired(entity) { if (!entity) return true; return Storage.timestamp - (entity.timestamp + entity.expiration) >= 0; } static get __info() { let info = {}; try { info = this.wx.getStorageInfoSync() || info; } catch (err) { console.error(err); } return info; } setItem(key, value, expiration) { const entity = { timestamp: Storage.timestamp, expiration, key, value }; this.wx.setStorageSync(key, JSON.stringify(entity)); return this; } getItem(key) { let entity; try { entity = this.wx.getStorageSync(key); if (entity) { entity = JSON.parse(entity); } else { return null; } } catch (err) { console.error(err); return null; } // 没有设置过期时间, 则直接返回值 if (!entity.expiration) return entity.value; // 已过期 if (Storage.__isExpired(entity)) { this.remove(key); return null; } else { return entity.value; } } removeItem(key) { try { this.wx.removeStorageSync(key); } catch (err) { console.error(err); } return this; } clear() { try { this.wx.clearStorageSync(); } catch (err) { console.error(err); } return this; } get info() { let info = {}; try { info = this.wx.getStorageInfoSync(); } catch (err) { console.error(err); } return info || {}; } get length() { return (this.info.keys || []).length; } } export default new Storage(wx); [代码] 状态管理 vendor/store.js [代码]module.exports = class Store { constructor({ state, actions }) { this.state = state || {} this.actions = actions || {} this.ctxs = [] } // 派发action, 统一返回promise action可以直接返回state dispatch(type, payload) { const update = res => { if (typeof res !== 'object') return this.setState(res) this.ctxs.map(ctx => ctx.setData(res)) return res } if (typeof this.actions[type] !== 'function') return const res = this.actions[type](this, payload) return res.constructor.toString().match(/function\s*([^(]*)/)[1] === 'Promise' ? res.then(update) : new Promise(resolve => resolve(update(res))) } // 修改state的方法 setState(data) { this.state = { ...this.state, ...data } } // 根据keys获取state getState(keys) { return keys.reduce((acc, key) => ({ ...acc, ...{ [key]: this.state[key] } }), {}) } // 映射state到实例中，可在onload或onshow中调用 mapState(keys, ctx) { if (!ctx || typeof ctx.setData !== 'function') return ctx.setData(this.getState(keys)) this.ctxs.push(ctx) } } [代码] 兼容 async/await vendor/regenerator.js [代码]/** * Copyright (c) 2014-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. */ var regeneratorRuntime = (function (exports) { "use strict"; var Op = Object.prototype; var hasOwn = Op.hasOwnProperty; var undefined; // More compressible than void 0. var $Symbol = typeof Symbol === "function" ? Symbol : {}; var iteratorSymbol = $Symbol.iterator || "@@iterator"; var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator"; var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag"; function wrap(innerFn, outerFn, self, tryLocsList) { // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator. var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator; var generator = Object.create(protoGenerator.prototype); var context = new Context(tryLocsList || []); // The ._invoke method unifies the implementations of the .next, // .throw, and .return methods. generator._invoke = makeInvokeMethod(innerFn, self, context); return generator; } exports.wrap = wrap; // Try/catch helper to minimize deoptimizations. Returns a completion // record like context.tryEntries[i].completion. This interface could // have been (and was previously) designed to take a closure to be // invoked without arguments, but in all the cases we care about we // already have an existing method we want to call, so there's no need // to create a new function object. We can even get away with assuming // the method takes exactly one argument, since that happens to be true // in every case, so we don't have to touch the arguments object. The // only additional allocation required is the completion record, which // has a stable shape and so hopefully should be cheap to allocate. function tryCatch(fn, obj, arg) { try { return { type: "normal", arg: fn.call(obj, arg) }; } catch (err) { return { type: "throw", arg: err }; } } var GenStateSuspendedStart = "suspendedStart"; var GenStateSuspendedYield = "suspendedYield"; var GenStateExecuting = "executing"; var GenStateCompleted = "completed"; // Returning this object from the innerFn has the same effect as // breaking out of the dispatch switch statement. var ContinueSentinel = {}; // Dummy constructor functions that we use as the .constructor and // .constructor.prototype properties for functions that return Generator // objects. For full spec compliance, you may wish to configure your // minifier not to mangle the names of these two functions. function Generator() {} function GeneratorFunction() {} function GeneratorFunctionPrototype() {} // This is a polyfill for %IteratorPrototype% for environments that // don't natively support it. var IteratorPrototype = {}; IteratorPrototype[iteratorSymbol] = function () { return this; }; var getProto = Object.getPrototypeOf; var NativeIteratorPrototype = getProto && getProto(getProto(values([]))); if (NativeIteratorPrototype && NativeIteratorPrototype !== Op && hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) { // This environment has a native %IteratorPrototype%; use it instead // of the polyfill. IteratorPrototype = NativeIteratorPrototype; } var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(IteratorPrototype); GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype; GeneratorFunctionPrototype.constructor = GeneratorFunction; GeneratorFunctionPrototype[toStringTagSymbol] = GeneratorFunction.displayName = "GeneratorFunction"; // Helper for defining the .next, .throw, and .return methods of the // Iterator interface in terms of a single ._invoke method. function defineIteratorMethods(prototype) { ["next", "throw", "return"].forEach(function(method) { prototype[method] = function(arg) { return this._invoke(method, arg); }; }); } exports.isGeneratorFunction = function(genFun) { var ctor = typeof genFun === "function" && genFun.constructor; return ctor ? ctor === GeneratorFunction || // For the native GeneratorFunction constructor, the best we can // do is to check its .name property. (ctor.displayName || ctor.name) === "GeneratorFunction" : false; }; exports.mark = function(genFun) { if (Object.setPrototypeOf) { Object.setPrototypeOf(genFun, GeneratorFunctionPrototype); } else { genFun.__proto__ = GeneratorFunctionPrototype; if (!(toStringTagSymbol in genFun)) { genFun[toStringTagSymbol] = "GeneratorFunction"; } } genFun.prototype = Object.create(Gp); return genFun; }; // Within the body of any async function, `await x` is transformed to // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test // `hasOwn.call(value, "__await")` to determine if the yielded value is // meant to be awaited. exports.awrap = function(arg) { return { __await: arg }; }; function AsyncIterator(generator) { function invoke(method, arg, resolve, reject) { var record = tryCatch(generator[method], generator, arg); if (record.type === "throw") { reject(record.arg); } else { var result = record.arg; var value = result.value; if (value && typeof value === "object" && hasOwn.call(value, "__await")) { return Promise.resolve(value.__await).then(function(value) { invoke("next", value, resolve, reject); }, function(err) { invoke("throw", err, resolve, reject); }); } return Promise.resolve(value).then(function(unwrapped) { // When a yielded Promise is resolved, its final value becomes // the .value of the Promise<{value,done}> result for the // current iteration. result.value = unwrapped; resolve(result); }, function(error) { // If a rejected Promise was yielded, throw the rejection back // into the async generator function so it can be handled there. return invoke("throw", error, resolve, reject); }); } } var previousPromise; function enqueue(method, arg) { function callInvokeWithMethodAndArg() { return new Promise(function(resolve, reject) { invoke(method, arg, resolve, reject); }); } return previousPromise = // If enqueue has been called before, then we want to wait until // all previous Promises have been resolved before calling invoke, // so that results are always delivered in the correct order. If // enqueue has not been called before, then it is important to // call invoke immediately, without waiting on a callback to fire, // so that the async generator function has the opportunity to do // any necessary setup in a predictable way. This predictability // is why the Promise constructor synchronously invokes its // executor callback, and why async functions synchronously // execute code before the first await. Since we implement simple // async functions in terms of async generators, it is especially // important to get this right, even though it requires care. previousPromise ? previousPromise.then( callInvokeWithMethodAndArg, // Avoid propagating failures to Promises returned by later // invocations of the iterator. callInvokeWithMethodAndArg ) : callInvokeWithMethodAndArg(); } // Define the unified helper method that is used to implement .next, // .throw, and .return (see defineIteratorMethods). this._invoke = enqueue; } defineIteratorMethods(AsyncIterator.prototype); AsyncIterator.prototype[asyncIteratorSymbol] = function () { return this; }; exports.AsyncIterator = AsyncIterator; // Note that simple async functions are implemented on top of // AsyncIterator objects; they just return a Promise for the value of // the final result produced by the iterator. exports.async = function(innerFn, outerFn, self, tryLocsList) { var iter = new AsyncIterator( wrap(innerFn, outerFn, self, tryLocsList) ); return exports.isGeneratorFunction(outerFn) ? iter // If outerFn is a generator, return the full iterator. : iter.next().then(function(result) { return result.done ? result.value : iter.next(); }); }; function makeInvokeMethod(innerFn, self, context) { var state = GenStateSuspendedStart; return function invoke(method, arg) { if (state === GenStateExecuting) { throw new Error("Generator is already running"); } if (state === GenStateCompleted) { if (method === "throw") { throw arg; } // Be forgiving, per 25.3.3.3.3 of the spec: // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume return doneResult(); } context.method = method; context.arg = arg; while (true) { var delegate = context.delegate; if (delegate) { var delegateResult = maybeInvokeDelegate(delegate, context); if (delegateResult) { if (delegateResult === ContinueSentinel) continue; return delegateResult; } } if (context.method === "next") { // Setting context._sent for legacy support of Babel's // function.sent implementation. context.sent = context._sent = context.arg; } else if (context.method === "throw") { if (state === GenStateSuspendedStart) { state = GenStateCompleted; throw context.arg; } context.dispatchException(context.arg); } else if (context.method === "return") { context.abrupt("return", context.arg); } state = GenStateExecuting; var record = tryCatch(innerFn, self, context); if (record.type === "normal") { // If an exception is thrown from innerFn, we leave state === // GenStateExecuting and loop back for another invocation. state = context.done ? GenStateCompleted : GenStateSuspendedYield; if (record.arg === ContinueSentinel) { continue; } return { value: record.arg, done: context.done }; } else if (record.type === "throw") { state = GenStateCompleted; // Dispatch the exception by looping back around to the // context.dispatchException(context.arg) call above. context.method = "throw"; context.arg = record.arg; } } }; } // Call delegate.iterator[context.method](context.arg) and handle the // result, either by returning a { value, done } result from the // delegate iterator, or by modifying context.method and context.arg, // setting context.delegate to null, and returning the ContinueSentinel. function maybeInvokeDelegate(delegate, context) { var method = delegate.iterator[context.method]; if (method === undefined) { // A .throw or .return when the delegate iterator has no .throw // method always terminates the yield* loop. context.delegate = null; if (context.method === "throw") { // Note: ["return"] must be used for ES3 parsing compatibility. if (delegate.iterator["return"]) { // If the delegate iterator has a return method, give it a // chance to clean up. context.method = "return"; context.arg = undefined; maybeInvokeDelegate(delegate, context); if (context.method === "throw") { // If maybeInvokeDelegate(context) changed context.method from // "return" to "throw", let that override the TypeError below. return ContinueSentinel; } } context.method = "throw"; context.arg = new TypeError( "The iterator does not provide a 'throw' method"); } return ContinueSentinel; } var record = tryCatch(method, delegate.iterator, context.arg); if (record.type === "throw") { context.method = "throw"; context.arg = record.arg; context.delegate = null; return ContinueSentinel; } var info = record.arg; if (! info) { context.method = "throw"; context.arg = new TypeError("iterator result is not an object"); context.delegate = null; return ContinueSentinel; } if (info.done) { // Assign the result of the finished delegate to the temporary // variable specified by delegate.resultName (see delegateYield). context[delegate.resultName] = info.value; // Resume execution at the desired location (see delegateYield). context.next = delegate.nextLoc; // If context.method was "throw" but the delegate handled the // exception, let the outer generator proceed normally. If // context.method was "next", forget context.arg since it has been // "consumed" by the delegate iterator. If context.method was // "return", allow the original .return call to continue in the // outer generator. if (context.method !== "return") { context.method = "next"; context.arg = undefined; } } else { // Re-yield the result returned by the delegate method. return info; } // The delegate iterator is finished, so forget it and continue with // the outer generator. context.delegate = null; return ContinueSentinel; } // Define Generator.prototype.{next,throw,return} in terms of the // unified ._invoke helper method. defineIteratorMethods(Gp); Gp[toStringTagSymbol] = "Generator"; // A Generator should always return itself as the iterator object when the // @@iterator function is called on it. Some browsers' implementations of the // iterator prototype chain incorrectly implement this, causing the Generator // object to not be returned from this call. This ensures that doesn't happen. // See https://github.com/facebook/regenerator/issues/274 for more details. Gp[iteratorSymbol] = function() { return this; }; Gp.toString = function() { return "[object Generator]"; }; function pushTryEntry(locs) { var entry = { tryLoc: locs[0] }; if (1 in locs) { entry.catchLoc = locs[1]; } if (2 in locs) { entry.finallyLoc = locs[2]; entry.afterLoc = locs[3]; } this.tryEntries.push(entry); } function resetTryEntry(entry) { var record = entry.completion || {}; record.type = "normal"; delete record.arg; entry.completion = record; } function Context(tryLocsList) { // The root entry object (effectively a try statement without a catch // or a finally block) gives us a place to store values thrown from // locations where there is no enclosing try statement. this.tryEntries = [{ tryLoc: "root" }]; tryLocsList.forEach(pushTryEntry, this); this.reset(true); } exports.keys = function(object) { var keys = []; for (var key in object) { keys.push(key); } keys.reverse(); // Rather than returning an object with a next method, we keep // things simple and return the next function itself. return function next() { while (keys.length) { var key = keys.pop(); if (key in object) { next.value = key; next.done = false; return next; } } // To avoid creating an additional object, we just hang the .value // and .done properties off the next function object itself. This // also ensures that the minifier will not anonymize the function. next.done = true; return next; }; }; function values(iterable) { if (iterable) { var iteratorMethod = iterable[iteratorSymbol]; if (iteratorMethod) { return iteratorMethod.call(iterable); } if (typeof iterable.next === "function") { return iterable; } if (!isNaN(iterable.length)) { var i = -1, next = function next() { while (++i < iterable.length) { if (hasOwn.call(iterable, i)) { next.value = iterable[i]; next.done = false; return next; } } next.value = undefined; next.done = true; return next; }; return next.next = next; } } // Return an iterator with no values. return { next: doneResult }; } exports.values = values; function doneResult() { return { value: undefined, done: true }; } Context.prototype = { constructor: Context, reset: function(skipTempReset) { this.prev = 0; this.next = 0; // Resetting context._sent for legacy support of Babel's // function.sent implementation. this.sent = this._sent = undefined; this.done = false; this.delegate = null; this.method = "next"; this.arg = undefined; this.tryEntries.forEach(resetTryEntry); if (!skipTempReset) { for (var name in this) { // Not sure about the optimal order of these conditions: if (name.charAt(0) === "t" && hasOwn.call(this, name) && !isNaN(+name.slice(1))) { this[name] = undefined; } } } }, stop: function() { this.done = true; var rootEntry = this.tryEntries[0]; var rootRecord = rootEntry.completion; if (rootRecord.type === "throw") { throw rootRecord.arg; } return this.rval; }, dispatchException: function(exception) { if (this.done) { throw exception; } var context = this; function handle(loc, caught) { record.type = "throw"; record.arg = exception; context.next = loc; if (caught) { // If the dispatched exception was caught by a catch block, // then let that catch block handle the exception normally. context.method = "next"; context.arg = undefined; } return !! caught; } for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; var record = entry.completion; if (entry.tryLoc === "root") { // Exception thrown outside of any try block that could handle // it, so set the completion value of the entire function to // throw the exception. return handle("end"); } if (entry.tryLoc <= this.prev) { var hasCatch = hasOwn.call(entry, "catchLoc"); var hasFinally = hasOwn.call(entry, "finallyLoc"); if (hasCatch && hasFinally) { if (this.prev < entry.catchLoc) { return handle(entry.catchLoc, true); } else if (this.prev < entry.finallyLoc) { return handle(entry.finallyLoc); } } else if (hasCatch) { if (this.prev < entry.catchLoc) { return handle(entry.catchLoc, true); } } else if (hasFinally) { if (this.prev < entry.finallyLoc) { return handle(entry.finallyLoc); } } else { throw new Error("try statement without catch or finally"); } } } }, abrupt: function(type, arg) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.tryLoc <= this.prev && hasOwn.call(entry, "finallyLoc") && this.prev < entry.finallyLoc) { var finallyEntry = entry; break; } } if (finallyEntry && (type === "break" || type === "continue") && finallyEntry.tryLoc <= arg && arg <= finallyEntry.finallyLoc) { // Ignore the finally entry if control is not jumping to a // location outside the try/catch block. finallyEntry = null; } var record = finallyEntry ? finallyEntry.completion : {}; record.type = type; record.arg = arg; if (finallyEntry) { this.method = "next"; this.next = finallyEntry.finallyLoc; return ContinueSentinel; } return this.complete(record); }, complete: function(record, afterLoc) { if (record.type === "throw") { throw record.arg; } if (record.type === "break" || record.type === "continue") { this.next = record.arg; } else if (record.type === "return") { this.rval = this.arg = record.arg; this.method = "return"; this.next = "end"; } else if (record.type === "normal" && afterLoc) { this.next = afterLoc; } return ContinueSentinel; }, finish: function(finallyLoc) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.finallyLoc === finallyLoc) { this.complete(entry.completion, entry.afterLoc); resetTryEntry(entry); return ContinueSentinel; } } }, "catch": function(tryLoc) { for (var i = this.tryEntries.length - 1; i >= 0; --i) { var entry = this.tryEntries[i]; if (entry.tryLoc === tryLoc) { var record = entry.completion; if (record.type === "throw") { var thrown = record.arg; resetTryEntry(entry); } return thrown; } } // The context.catch method must only be called with a location // argument that corresponds to a known catch block. throw new Error("illegal catch attempt"); }, delegateYield: function(iterable, resultName, nextLoc) { this.delegate = { iterator: values(iterable), resultName: resultName, nextLoc: nextLoc }; if (this.method === "next") { // Deliberately forget the last sent value so that we don't // accidentally pass it on to the delegate. this.arg = undefined; } return ContinueSentinel; } }; // Regardless of whether this script is executing as a CommonJS module // or not, return the runtime object so that we can declare the variable // regeneratorRuntime in the outer scope, which allows this module to be // injected easily by `bin/regenerator --include-runtime script.js`. return exports; }( // If this script is executing as a CommonJS module, use module.exports // as the regeneratorRuntime namespace. Otherwise create a new empty // object. Either way, the resulting object will be used to initialize // the regeneratorRuntime variable at the top of this file. typeof module === "object" ? module.exports : {} )); [代码] 后端 [代码]const typeDefs = gql` # schema 下面是根类型，约定是 RootQuery 和 RootMutation schema { query: Query } # 定义具体的 Query 的结构 type Query { # 登陆接口 login(code: String!, encryptedData: String, iv: String): Login } type Login { token: String! userInfo: UserInfo } type UserInfo { nickName: String gender: String avatarUrl: String } `; const resolvers = { Query: { async login(parent, { code, encryptedData, iv }) { const { sessionKey, openId, unionId } = await wxService.code2Session(code); const userInfo = encryptedData && iv ? wxService.decryptData(sessionKey, encryptedData, iv) : { openId, unionId }; if (userInfo.nickName) { userService.createOrUpdateWxUser(userInfo); } const token = await userService.generateJwtToken(userInfo); return { token, userInfo }; }, }, }; [代码]

1、输入框居然不支持双向绑定。 2、只有自定义组件支持observer,页面不支持。 3、必须通过setData来更改数据。不知设计时为什么不用Object.defineProperty来实现响应式数据。 4、客户端性能低下。同一个交互动画，在移动版的谷歌浏览器上丝滑顺畅，在小程序客户端上卡得如麻。 5、不支持层级路由，导致一个公共头组件，每个页面都要加上。 6、组件上事件监听只支持以函数名作为参数，不可以放参，不可以用js表达式，导致一个简单的加法还必须做个函数实现，非常不方便。 希望小程序未来能够解决以上问题。