Count numbers and output one char at time
var s = '';
for (var i = 1; i <= 42; i++) s += i.toString();

for (var i = 0; i < s.length; i++) {
  // output s[i]
}

var str = number.toString(); // the current number as you're looping through
for (var k = 0; k < str.length; k++) {
    var oneLetterAtATime = str.charAt(k); // get the digits one at a time
    output += "<td>" + oneLetterAtATime + "</td>";
}
number++;

if (k > 0) {
    j++;
}

var t = '';
var limit=100;
for (var j = 1; j<= limit; j++) t += j.toString();

var output='';
for (var j = 0; j < t.length; j++) {
  output=output+','+t[i];
}
alert(output);

rows = 3;
columns = 19;
number = 1;
var str = "";
output = '<table style="width:100%;">';
for(var i = 0; i < rows; i++) {
    output += "<tr>";
    for(var j = 0; j < columns; j++) {
        output += "<td>" + number + "</td>";
        str +=number;
        number++;
    }
    output += "</tr>";
}
output += "</table>";
$("#game").html(output);

var strvalue="";

$.each(str, function(e,v){
    if (e > 0){
        strvalue = strvalue + ", "+ v;
    }
    else{
    strvalue += v;
    }
});

alert(strvalue);