fastest way to select the nth digit in integer in javascript?

I tried different way to get the ntn digit in an integer.

function toStringAndCharAt(ntn, number){
  return number.toString().charAt(ntn);
}
  
function plusAndCharAt(ntn, number){
  return (number + '').charAt(ntn);
}
  
function plusAndIndex(ntn, number){
  return (number + '')[ntn];
}
  
function math(ntn, number){
  var len = Math.floor( Math.log(number) / Math.LN10 ) - ntn;
  return ( (number / Math.pow(10, len)) % 10) | 0;
}

See http://jsperf.com/fastest-way-to-get-the-first-in-a-number/2

There are huge performance different between browsers. ☺

Conclusion:

Use Math is the fastest in most case: