based on line-by-line, and add function readlines, can read some lines.
usage:
var FSReadLines = require("fsreadlines");
var fsreadlines = new FSReadLines();
var test = async function(){
fsreadlines.openFile(__dirname + '\\test.js');
var nNum = 5
while(true){
var lines = await fsreadlines.readLines(nNum);
console.log(lines);
console.log(lines.length);
if (lines.length < nNum){
break;
}
}
console.log('finish.');
fsreadlines.closeFile();
}
test();