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今天呢，我们来看一个糊涂用语，文档

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我们经常听到这样的话

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你们怎么一上手就写代码

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连个文档都没有

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或者问一个人

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你现在在做什么呀

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他说，我在写文档

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或者有的人说，代码就是文档

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你看，这个文档就出现在类似这样的场合

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那么

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当前面这些，他说到文档的时候

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这个文档是什么呢

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可能是这样的

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他把所做的工作分成两块

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一块是代码

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也就是最终

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交给计算机来编译运行的那个介质

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也就是人跟计算机接口的

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最终的介质，给计算机发命令那个介质

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这是代码

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而剩下的

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他通通叫文档

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所以文档的意思是

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代码之外的所有东西

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或者说，他把那个

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他用编码工具写的东西

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就是代码

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用编码工具之外的

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比如说他用Word写的

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或者用别的什么工具写的

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比如说用EA画图什么之类的

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那这叫文档

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编码之外的所有工作

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或者非编码工具产出的东西

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但是这个是不对的

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那另外一种

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或者刚才这一种

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这样的一种想法

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它本质上

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是把代码

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放在了最核心的位置

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然后呢

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把文档

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看作是代码的

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某些概要视图

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所以呢，在他的大脑里面

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这个文档那个文档无非是什么

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不同级别的代码的视图而已

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不同角度

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不同级别的代码视图

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那很多人

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在他大脑里面，文档扮演的是这样一个角色

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但是这个是错的

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那像这样的误解

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不只是一般的开发人员会有

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包括一些有名的名人

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比如Martin Fowler

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他也会有这样误解

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你看他在《UML精粹》这个书里面

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他说了

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UML有三种使用的方式

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有草稿的

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蓝图的、编程语言的

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实际上是把它看作是什么

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把UML也好

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什么也好

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看作是代码的一个视图而已

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代码是核心

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其他的就是它的视图

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无非是粗糙一点的

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精细一点的视图

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对不对

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但这个是错的

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Fowler他擅长的是什么

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C和D，我们说ABCD嘛

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业务建模、需求、分析、设计

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他擅长分析和设计

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A和B

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擅长不擅长

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不知道

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但我没有见过他写的那些

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怎么做业务建模

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做需求的文章没有

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书也没有

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都是说什么

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我要做一个什么系统

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然后就开始，里面有哪些类什么之类的

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这系统怎么样好卖

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怎么样去描述这个需求

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怎么样怎么样

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Fowler应该是很少看到他有这方面的阐述

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不只是Fowler了

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其他的像那个

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一些著名的敏捷的书也是

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一开始就说我要做一个什么系统

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功能是这个

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也就是说，需求都已经确定了

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然后再说我打算怎么做

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那就已经到C和D了

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AB不擅长

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那像这样的误解有什么危害呢

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危害就是

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思维颠倒

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会让开发人员，他会怎么做

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他先拍脑袋

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先写代码

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然后呢

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再从实现去反推其他工作流的内容

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那这种我经常碰到的

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像右边这个场景

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就是我经常碰到的一种情况

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比如说，我跟那个开发人员说

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根据愿景什么的

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你这个系统不需要有这个用例的

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或者说不需要有这个功能的

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开发人员说

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有的，我都写好了

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你看，我运行给你看，系统就有这个功能

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就有这个用例

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系统应不应该有这个用例

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应该从什么来看

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从卖的角度来看

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你从

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业务流程的角度看

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系统提供这个功能

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提供这个用例

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到底有没有给我们的组织带来好处

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涉众的利益有没有得到改善

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从这个角度，该有就有，没有就没有

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对不对

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不是说你写好了代码，能运行了

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所以它就有这个功能

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不是这样的

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那另外一种就是这个

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比如说，我评审那个

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开发人员的

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类的设计

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然后呢

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我就说，这两个类关系不应该是泛化

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应该是关联才对的

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然后开发人员就说，是泛化的

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你不信，我打开代码给你看

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代码，你看我都写了

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A扩展B

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A继承B

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你看，不是泛化吗

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你再不信

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我把它逆转成UML类图给你看

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你都先写好代码了

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说人是猪的一种

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写好了

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而且编译运行了

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然后呢

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再从这个反推

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你看，我代码都写了

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人是猪的一种嘛

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所以呢，我图里面画，人是猪的一种

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那是没错的

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很多人会这样想

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包括你看

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我们现在经常看到一些领域系统设计的文章

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整篇文章就是泛泛而谈

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胡说八道的

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什么也没说

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但你不服不行哦

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人家有代码

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一开始就给你一个代码的链接

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他有代码哦

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你看，我代码都写好了

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你代码写好能运行了

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能说明什么问题

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能说明你这里面逻辑的组织是合理的吗

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能说明你这个需求

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的推导是正确的吗

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不能的

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对不对

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那我们很多人

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因为他只会写代码

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然后呢

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随便拍脑袋

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写一段代码，能运行了

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他就以这个来证明

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他前面的工作都是对的

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不行的

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所以呢，这里面的区别在于什么

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我们要学会从ABCD

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这样来判断

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我们思考的内容

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业务建模

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需求、分析、设计

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这样来思考我们的内容，不要看形式

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不能说，我正在编码

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我正在敲代码

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所以呢，我做的就是D

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设计，不一定的

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很可能你这时候想的是需求

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对吧

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可能想的是分析

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可能甚至是业务建模

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而且怎么样

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即使你唯一的工具

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是编码的工具

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并不代表说你不能用编码工具来写需求

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对不对

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你把整个系统作为研究对象

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那什么是需求

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需求就是系统的功能嘛

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系统的责任，你把整个系统作为研究对象来写代码

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那它暴露的那个

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服务

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暴露的接口不就是系统的需求吗

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对不对

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如果你只有代码工具

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你也可以在代码里面表达需求

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只要你研究或者思考的问题

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是需求的问题就可以

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同样

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你看到有人在画UML图

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那他一定就是做分析

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做需求，做什么吗

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不一定的

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很可能这个UML图就是它的代码

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比如说，他用Rhapsody

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来画状态机图

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画完了

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然后仿真

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没问题了

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他就直接运行了

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对不对

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他不用去写那个文本的代码

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文本代码都已经隐藏在后面了

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背后的C/C++代码都隐藏在状态机后面了

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他所有的逻辑都在状态机上表达的嘛

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这个时候，所谓的状态机图

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就已经是代码了

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因为它是这个人

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和

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计算机

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交接的

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那个介质了

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最终的介质，因为人并不需要再去编辑C/C++文本

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00:10:15,460 --> 00:10:16,570

261
00:10:19,790 --> 00:10:22,331
所以呢，我们了解了这个之后

262
00:10:22,331 --> 00:10:25,460
就不要再说我在写文档这种废话了

263
00:10:26,020 --> 00:10:26,900

264
00:10:27,180 --> 00:10:28,433
这种意思是

265
00:10:28,433 --> 00:10:30,939
我正在用Word来工作而已

266
00:10:30,939 --> 00:10:31,190

267
00:10:31,470 --> 00:10:33,188
你要说内容

268
00:10:33,188 --> 00:10:34,692
我在做业务建模

269
00:10:34,692 --> 00:10:38,130
我在思考需求问题，要这样说

270
00:10:38,410 --> 00:10:38,944
然后呢

271
00:10:38,944 --> 00:10:41,258
你在上面加一些废话也可以的

272
00:10:41,258 --> 00:10:42,860
我在写业务建模文档

273
00:10:43,140 --> 00:10:43,487

274
00:10:43,487 --> 00:10:45,570
这也可以对吧

275
00:10:45,850 --> 00:10:47,565
或者你加多点废话

276
00:10:47,565 --> 00:10:51,211
我在写需求文档规约说明书，都可以

277
00:10:51,211 --> 00:10:53,355
至少内容这个要有

278
00:10:53,355 --> 00:10:54,427
这个下划线

279
00:10:54,427 --> 00:10:55,500
这个要有，你在干嘛

280
00:10:55,780 --> 00:10:56,044

281
00:10:56,044 --> 00:10:58,690
要有内容在里面

282
00:10:59,010 --> 00:10:59,197

283
00:10:59,197 --> 00:11:00,880
你这个形式什么

284
00:11:02,090 --> 00:11:02,891
都好说

285
00:11:02,891 --> 00:11:03,493
内容

286
00:11:03,493 --> 00:11:05,498
你难道你不写文档不行吗

287
00:11:05,498 --> 00:11:06,901
我嘴巴说不行吗

288
00:11:06,901 --> 00:11:09,708
我嘴巴描述一下我们组织的流程

289
00:11:09,708 --> 00:11:10,910
那也是建模

290
00:11:10,910 --> 00:11:11,512
对不对

291
00:11:11,512 --> 00:11:13,316
那也是在做业务建模

292
00:11:13,316 --> 00:11:15,922
我嘴巴说一下系统有什么功能

293
00:11:15,922 --> 00:11:17,727
那也是在做需求的

294
00:11:17,727 --> 00:11:20,734
不一定要写一个文档或者画一个图

295
00:11:20,734 --> 00:11:20,934

296
00:11:20,934 --> 00:11:23,140
关键你讲的内容是什么

297
00:11:23,560 --> 00:11:24,968
把内容加上

298
00:11:24,968 --> 00:11:26,780
不要说那个形式