获取文件夹和子文件夹中的所有文件

function walkSync(currentDirPath, callback) {
  // attrib: https://stackoverflow.com/questions/2727167/how-do-you-get-a-list-of-the-names-of-all-files-present-in-a-directory-in-node-j

  fs.readdirSync(currentDirPath).forEach(function (name) {
    var filePath = path.join(currentDirPath, name);
    var stat = fs.statSync(filePath);
    if (stat.isDirectory()) {
      if (hasChildDirectories(filePath)) {
        walkSync(filePath, callback);
      }
      callback(filePath, stat);
    }
  });
}