Reading Text File in JavaScript [closed]

function readTextFile(file_name)
{
    var file = new XMLHttpRequest();
    file.open("GET", file_name, false);
    file.onreadystatechange = function ()
    {
        if(file.readyState === 4)
        {
            if(file.status === 200 || file.status == 0)
            {
                allText = file.responseText;
                document.write(allText+"<BR>");
            }
        }
    }
    file.send(null);
}
function processTextValue()
{
	var in_arr = ['PROTO', 'TTL', 'TOS', 'ID', 'IpLen', 'DgmLen'];
	for(var i=0; i<in_arr.length; i++)
	{
		var c = in_arr[i];
		var n = allText.indexOf(c);
		var m = allText.indexOf(" ", n);
		n = n+c.length+1;
		document.write(c+": "+allText.substr(n, m-n)+"<BR>");
	}
}

readTextFile('your_file.txt');
processTextValue();