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脚手架的开发流程
1 )开发流程
- 创建 npm 项目
 - 创建脚手架入口文件,最上方添加: 
#!/usr/bin/env node
 - 配置 package.json, 添加 bin 属性
 - 编写脚手架代码
 - 将脚手架发布到 npm
 
2 )使用流程
-  
安装脚手架
npm install -g your-own-cli
 -  
使用脚手架
your-own-cli
 
3 )脚手架开发难点
- 分包: 将复杂的系统拆分成若干个模块,并且合并成一个复杂系统
 - 命令注册,如: 
- $ 
vue create - $ 
vue add - $ 
vue invoke - 这里需要了解,如何注册命令,以及执行命令
 
 - $ 
 - 参数解析 
- 如:
vue command [options] <params> - options全称: --version, --help
 - options简写:-V, -h
 - 带params的options: --path /Users/xxx/…/vue-test
 - 帮助文档: 
- global help 是指对主命令进行帮助 
- Usage
 - Options
 - Commands
 
 - vue的帮助文档示例,这个属于 global help
$ vue Usage: vue <command> [options]Options:-V, --version output the version number-h, --help output usage informationCommands:create [options] <app-name> create a new project powered by vue-cli-serviceadd [options] <plugin> [pluginOptions] install a plugin and invoke its generator in an already created projectinvoke [options] <plugin> [pluginOptions] invoke the generator of a plugin in an already created projectinspect [options] [paths...] inspect the webpack config in a project with vue-cli-serviceserve [options] [entry] serve a .js or .vue file in development mode with zero configbuild [options] [entry] build a .js or .vue file in production mode with zero configui [options] start and open the vue-cli uiinit [options] <template> <app-name> generate a project from a remote template (legacy API, requires @vue/cli-init)config [options] [value] inspect and modify the configupgrade [semverLevel] upgrade vue cli service / plugins (default semverLevel: minor)info print debugging information about your environmentRun vue <command> --help for detailed usage of given command.- 可见,可通过 vue -V, 或 vue -h 可查看具体的信息
 - global help 只能表示主命令的用法,对于子命令,也同样需要
 
 - command help 子命令帮助 
- Usage
 - Options
 
 - 子命令的帮助信息,举例
$ vue create Usage: create [options] <app-name>create a new project powered by vue-cli-serviceOptions:-p, --preset <presetName> Skip prompts and use saved or remote preset-d, --default Skip prompts and use default preset-i, --inlinePreset <json> Skip prompts and use inline JSON string as preset-m, --packageManager <command> Use specified npm client when installing dependencies-r, --registry <url> Use specified npm registry when installing dependencies (only for npm)-g, --git [message] Force git initialization with initial commit message-n, --no-git Skip git initialization-f, --force Overwrite target directory if it exists-c, --clone Use git clone when fetching remote preset-x, --proxy Use specified proxy when creating project-b, --bare Scaffold project without beginner instructions--skipGetStarted Skip displaying "Get started" instructions-h, --help output usage informationMissing required argument <app-name>. 
 - global help 是指对主命令进行帮助 
 - 同样,还有很多,如: 
- 命令行交互: 可以选择
 - 日志打印: 标准打印
 - 命令行文字变色: 错误红色,警告黄色
 - 网络通信:HTTP/WebSocket
 - 文件处理
 - …
 
 
 - 如:
 
