code: function traverseFilesAndCb(curDir, cb) {
      let fileDirs = [curDir];
      while (fileDirs.length) {
          let currDir = fileDirs.pop();
          let files = fs.readdirSync(currDir);
          for (let i = 0, len = files.length; i < len; i++) {
              let fileName = files[i];
  
              if (/^\./.test(fileName)) {
                  continue;
              }
  
              let fullPath = path.resolve(currDir, fileName);
              let stat = getFileState(fullPath);
              if (!stat) {
                  continue;
              }
  
              let isDir = stat.isDirectory();
              if (isDir) {
                  fileDirs.push(fullPath);
                  continue;
              }
  
              if (typeof cb === 'function') {
                  cb(fullPath);
              }
          }
      }
  }
docs: 遍历当前文件夹下的文件并进行回调操作
  
  @param  {string}   curDir 当前的目录
  @param  {Function} cb callback function