Node.js实现批量去除BOM文件头

之前的同事写了一个工具，但有bug，就是在替换文件后原文件的格式变成utf8 BOM了，这种带BOM的XML在Mac下可能读取不出来，所以就需要写个工具处理一下。

其实思路比较简单，首先遍历目录，然后读取目录，将文件头三个字节去除掉，然后保存为utf-8格式的文件即可，直接上代码吧 :)

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);