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README
MulanPSL-2.0

use-async

在目前主流的 MVVM 框架, vuereact 中有一个通病或者痛点: 业务的逻辑被分散在各个文件中。

比如 react 如果跟 redux 搭配, 那么业务流程的控制,可能 redux 中有一部分, 涉及 state 的业务更新逻辑。 react 中有一部分, 涉及事件的响应逻辑。

很多的时候, 我们往往会强制要求, 业务逻辑必须怎么怎么写, 放到哪个文件里面。但是遇到异步的, 业务操作是连续的时候,这种规定往往不经意间就被打破。

比如有一种任务提交流程

1 -> 是否提交 ?

这种处理还好做, 非常简单, 一行代码估计就搞定

2 -> 选择提交模板

这种可能需要涉及事件处理, 需要响应用户的操作。 实际代码层面, 这个业务流程就断了。

3 -> 选择提交的说明

这种也是如此, 响应用户操作

4 -> 各种提参校验, 最后提交

上面列举的步骤其实很简答。但是涉及的变量和状态控制, 可能不少于 7-8 个。

如果再涉及到 组件生命周期 的处理, 代码只会更分散。往往一个流程,要翻遍几乎所有的核心文件目录, 什么 componet, store, services 等等。

因此 use-async 就应运而生了。当然 use-async 只是解决这个痛点的一种方案, 并不是万金油。使用之前,还需要开发者自己衡量一下。

安装

npm install -S @zjxpcyc/use-async

使用


import useAsync from '@zjxpcyc/use-async'

// 这里以伪代码的方式解决刚刚示例痛点
handleSubmit = async () => {
  // 1. 是否提交
  wait useAsync(

    // useAsync 有2个参数
    // 第一个是需要执行逻辑的函数
    // 该函数的第一个参数有 next, cancel 两个属性
    // next 是流程继续, cancel 是流程结束
    ({ next, cancel }, isSubmit) => {
      if (isSubmit) next();
    },
    
    // 第二个参数是一个 setter
    // 用来将你写的函数绑定到当前对象上, 以便后面事件绑定
    // 比如本例, handleConfirmModal 将会被如下的形式绑定
    // <Confirm onSubmit={(isSubmit) => { this.handleConfirmModal(isSubmit) }}>
    fn => (this.handleConfirmModal = fn)
  )

  // 2. 选择提交模板
  // 先打开弹窗
  this.setState({ showTemplate: true })

  // 这里演示里 useAsync 的第二种用法
  // 第一个参数是一个事件函数的名称, 第二个是当前组件
  // 也就是说 handleTemplateCheck 会在某个地方被定义
  // 支持这种方式的原因是, 可能业务逻辑跟基本的事件处理是不同文件
  // 这种方式会将原来的事件函数给替换掉, 但是不影响原来的代码逻辑
  // 同时新增一个对应的 Cancel 函数来处理相反的流程
  // 假设 handleTemplateCheck 是如下代码
  // handleTemplateCheck = ({next}, template) => { this.setState({ template, showTemplate: false }, next) }
  // 这个示例中 componentInstance 会被绑定一个 handleTemplateCheckCancel 方法
  wait useAsync('handleTemplateCheck', componentInstance)

  // 3. 提交文件说明
  this.setState({ showDesc: true })
  wait useAsync('handleDesChange', componentInstance)

  // 4. 验证提交
  // some code ...
}

上述演示, 很好的解决了因为异步逻辑造成的代码阻断. 同时也减少了代码耦合, 实现了关注点分离。 如果跟 redux 这种样板代码很多的框架组合, 如果 redux 可以再封装一层通用层, 甚至可以直接解放大部分的 redux 的样板代码。

最后

这个小的 lib 还有很多不足, 后期会继续跟进优化

木兰宽松许可证, 第2版 木兰宽松许可证, 第2版 2020年1月 http://license.coscl.org.cn/MulanPSL2 您对“软件”的复制、使用、修改及分发受木兰宽松许可证,第2版(“本许可证”)的如下条款的约束: 0. 定义 “软件”是指由“贡献”构成的许可在“本许可证”下的程序和相关文档的集合。 “贡献”是指由任一“贡献者”许可在“本许可证”下的受版权法保护的作品。 “贡献者”是指将受版权法保护的作品许可在“本许可证”下的自然人或“法人实体”。 “法人实体”是指提交贡献的机构及其“关联实体”。 “关联实体”是指,对“本许可证”下的行为方而言,控制、受控制或与其共同受控制的机构,此处的控制是指有受控方或共同受控方至少50%直接或间接的投票权、资金或其他有价证券。 1. 授予版权许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的版权许可,您可以复制、使用、修改、分发其“贡献”,不论修改与否。 2. 授予专利许可 每个“贡献者”根据“本许可证”授予您永久性的、全球性的、免费的、非独占的、不可撤销的(根据本条规定撤销除外)专利许可,供您制造、委托制造、使用、许诺销售、销售、进口其“贡献”或以其他方式转移其“贡献”。前述专利许可仅限于“贡献者”现在或将来拥有或控制的其“贡献”本身或其“贡献”与许可“贡献”时的“软件”结合而将必然会侵犯的专利权利要求,不包括对“贡献”的修改或包含“贡献”的其他结合。如果您或您的“关联实体”直接或间接地,就“软件”或其中的“贡献”对任何人发起专利侵权诉讼(包括反诉或交叉诉讼)或其他专利维权行动,指控其侵犯专利权,则“本许可证”授予您对“软件”的专利许可自您提起诉讼或发起维权行动之日终止。 3. 无商标许可 “本许可证”不提供对“贡献者”的商品名称、商标、服务标志或产品名称的商标许可,但您为满足第4条规定的声明义务而必须使用除外。 4. 分发限制 您可以在任何媒介中将“软件”以源程序形式或可执行形式重新分发,不论修改与否,但您必须向接收者提供“本许可证”的副本,并保留“软件”中的版权、商标、专利及免责声明。 5. 免责声明与责任限制 “软件”及其中的“贡献”在提供时不带任何明示或默示的担保。在任何情况下,“贡献者”或版权所有者不对任何人因使用“软件”或其中的“贡献”而引发的任何直接或间接损失承担责任,不论因何种原因导致或者基于何种法律理论,即使其曾被建议有此种损失的可能性。 6. 语言 “本许可证”以中英文双语表述,中英文版本具有同等法律效力。如果中英文版本存在任何冲突不一致,以中文版为准。 条款结束 如何将木兰宽松许可证,第2版,应用到您的软件 如果您希望将木兰宽松许可证,第2版,应用到您的新软件,为了方便接收者查阅,建议您完成如下三步: 1, 请您补充如下声明中的空白,包括软件名、软件的首次发表年份以及您作为版权人的名字; 2, 请您在软件包的一级目录下创建以“LICENSE”为名的文件,将整个许可证文本放入该文件中; 3, 请将如下声明文本放入每个源文件的头部注释中。 Copyright (c) [Year] [name of copyright holder] [Software Name] is licensed under Mulan PSL v2. 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