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})