Node.JS 循環遞歸復制文件夾目錄及其子文件夾下的所有文件

var fs = require('fs')
var path = require('path')

var copyFile = function(srcPath, tarPath, cb) {
 var rs = fs.createReadStream(srcPath)
 rs.on('error', function(err) {
 if (err) {
 console.log('read error', srcPath)
 }
 cb && cb(err)
 })

 var ws = fs.createWriteStream(tarPath)
 ws.on('error', function(err) {
 if (err) {
 console.log('write error', tarPath)
 }
 cb && cb(err)
 })
 ws.on('close', function(ex) {
 cb && cb(ex)
 })

 rs.pipe(ws)
}

var copyFolder = function(srcDir, tarDir, cb) {
 fs.readdir(srcDir, function(err, files) {
 var count = 0
 var checkEnd = function() {
 ++count == files.length && cb && cb()
 }

 if (err) {
 checkEnd()
 return
 }

 files.forEach(function(file) {
 var srcPath = path.join(srcDir, file)
 var tarPath = path.join(tarDir, file)

 fs.stat(srcPath, function(err, stats) {
 if (stats.isDirectory()) {
 console.log('mkdir', tarPath)
 fs.mkdir(tarPath, function(err) {
 if (err) {
 console.log(err)
 return
 }

 copyFolder(srcPath, tarPath, checkEnd)
 })
 } else {
 copyFile(srcPath, tarPath, checkEnd)
 }
 })
 })

 //為空時直接回調
 files.length === 0 && cb && cb()
 })
}

copyFolder('...', '....', function(err) {
 if (err) {

 return
 }

 //continue
})