node js 读取文件内容

来段node js  逐行读取文件内容 的代码

function readLines(input, func) {
    var remaining = '';
    input.on('data', function(data) {
        remaining += data;
        var index = remaining.indexOf('\n');
        while (index > -1) {
            var line = remaining.substring(0, index);
            remaining = remaining.substring(index + 1);
            func(line);
            index = remaining.indexOf('\n');
        }

    });

    input.on('end', function() {
        if (remaining.length > 0) {
            func(remaining);
        }
    });
}

function func(data) {
    container.push(data);
}

var input = fs.createReadStream(__dirname + '/ip_arr.txt');
readLines(input, func);