Node.js批量去除BOM文件

var fs = require('fs');
var path = "目标路径..";


function readDirectory(dirPath) {
if (fs.existsSync(dirPath)) {
var files = fs.readdirSync(dirPath);

        files.forEach(function(file) {
var filePath = dirPath + "/" + file;
var stats = fs.statSync(filePath);

if (stats.isDirectory()) {
                console.log('\n读取目录：\n', filePath, "\n");
                readDirectory(filePath);
            } else if (stats.isFile()) {
var buff = fs.readFileSync(filePath);
if (buff[0].toString(16).toLowerCase() == "ef" && buff[1].toString(16).toLowerCase() == "bb" && buff[2].toString(16).toLowerCase() == "bf") {
//EF BB BF 239 187 191
                    console.log('\发现BOM文件：', filePath, "\n");

                    buff = buff.slice(3);
                    fs.writeFile(filePath, buff.toString(), "utf8");
                }
            }
        });        

    } else {
        console.log('Not Found Path : ', dirPath);
    }
}

readDirectory(path);