该案例具体命令作用如下

1. -v,-V output the version number
   2. -d —del 删除当前路径下的所有文件与文件夹
   3. -c —copydir 拷贝文件夹到指定目录
   4. -h, —help display help for command
   5. 当不传入参数，会展示当前node目录下的文件信息

   ! /usr/bin/env node

   const { program } = require(“commander”);
   const fs = require(“fs”);
   const { join } = require(“path”);
   const { extname } = require(“path”)

   let paths = process.cwd();

   program
   .version(“1.0.1”, “-v,-V”)
   .option(“-d —del “, “删除当前路径下的所有文件与文件夹”)
   .option(“-c —copydir”, “拷贝文件夹到指定目录”)
   .action((res, com) => {
   if (com.args.length == 0) {
   readDir(paths);
   } else if (res.del) {
   delFile(join(paths, res.del));
   } else if (res.copydir) {
   copydir(join(paths, com.args[0]), join(paths, com.args[1]))
   }
   })
   .parse(process.argv)

   //删除文件夹
   function delFile(filepath) {
   if (fs.existsSync(filepath)) {
   if (fs.statSync(filepath).isDirectory()) {
   let dirArr = fs.readdirSync(filepath);
   dirArr.forEach(item => {
   delFile(join(filepath, item));
   })
   } else {
   fs.unlinkSync(filepath);
   }
   fs.rmdirSync(filepath);
   } else {
   console.log(“该路径不合法”);
   }
   }

   //克隆文件夹
   function copydir(srcpath, distpath) {
   if (fs.existsSync(srcpath)) {
   !fs.existsSync(distpath) && fs.mkdirSync(distpath);

        if (fs.statSync(srcpath).isDirectory()) {<br />                let dirArr = fs.readdirSync(srcpath);
            dirArr.forEach(item => {<br />                    if (fs.statSync(join(srcpath, item)).isDirectory()) {<br />                        copydir(join(srcpath, item), join(distpath, item));<br />                    } else {<br />                        fs.copyFileSync(join(srcpath, item), join(distpath, item));<br />                    }<br />                })<br />            } else {<br />                fs.copyFileSync(srcpath, distpath);<br />            }<br />        } else {<br />            console.log("该路径不合法");<br />        }<br />    }

   //读取当前执行的node目录下的文件信息
   function readDir(dirPath) {
   let dirArr = fs.readdirSync(dirPath);
   let str = “路径” + dirPath + “下的所有文件有：”;

    dirArr.forEach(item => {<br />            if (fs.statSync(join(dirPath, item)).isFile()) {<br />                str += `\n\n${item}:<br />                    文件大小：${fs.statSync(join(dirPath, item)).size} <br />                    文件类型：${extname(join (dirPath, item)).substr(1)}`;<br />            }<br />        })
    console.log(str);<br />    }