[Tips]Javascrip计算文件行数

function calcLineCount(filename, callback) {
    var fs = require(‘fs‘);

    var fileStream = fs.createReadStream(filename),
        lines = 0;

    fileStream.on(‘data‘, function (buf) {
        lines += buf.toString().match(/\n/g).length + 1;
    });

    fileStream.on(‘end‘, function () {
        callback(lines);
    });
}

calcLineCount(‘/Users/piaoger/Downloads/lc.js‘, function(lines) {
    console.log(lines);
});