在此之前先介绍一个逐行读取文件内容NPM：https://github.com/nickewing/line-reader,需要的朋友可以看看。
直接上代码：
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);