遍历文件

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使用 fs 模块遍历文件，有递归、非递归两种方式

递归：

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function travel(dir, callback) {
    fs.readdirSync(dir).forEach(function (file) {
        var pathname = path.join(dir, file);

        if (fs.statSync(pathname).isDirectory()) {
            travel(pathname, callback);
        } else {
            callback(pathname);
        }
    });
}

// 调用
travel('c:\\workspace\\nodejs\\public', (pathname) => {
  console.log(pathname);
});

非递归：

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function travel(dir, callback, finish) {
    fs.readdir(dir, function (err, files) {
        (function next(i) {
            if (i < files.length) {
                var pathname = path.join(dir, files[i]);

                fs.stat(pathname, function (err, stats) {
                    if (stats.isDirectory()) {
                        travel(pathname, callback, function () {
                            next(i + 1);
                        });
                    } else {
                        callback(pathname, function () {
                            next(i + 1);
                        });
                    }
                });
            } else {
                finish && finish();
            }
        }(0));
    });
}

// 调用
travel('c:\\workspace\\nodejs\\public', (pathname, next) => {
  console.log(pathname);
  next();
});