文件数据过滤，并将过滤后的数据存入新的文件。

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const fs = require('fs');
const readline = require('readline');
const path1 = __dirname + '/aid_imei_mac.log';
const path2 = __dirname + '/aid_imei_mac1.log';
let wf = fs.createWriteStream(path2) // 创建一个写入流
const strem = process.stderr; // 终端输出
const rl = readline.createInterface({
    input: fs.createReadStream(path1),
    // output: process.stdout
});
let i = 0
rl.on('line', (line) => {
    if (line.split(',').filter(i => !!i).length == 3) {
        wf.write(line + '\n')
        i++
        // 控制台输入写入进度
        strem.cursorTo(0)
        strem.write(`写入${i}行${(wf.bytesWritten / 1024 / 1024).toFixed(2)}M 数据`)
    }
});
rl.on('close', function () {
    //将操作系统缓存区中的数据全部写入文件
    wf.end(function () {
        console.log('\n文件全部写入完毕');
        console.log(`共写入${(wf.bytesWritten / 1024 / 1024).toFixed(2)}M 数据`);
    });
});
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