[JavaScript] Parse Accept-Language in HTTP Request Header

/**
 * Parse HTTP accept-language header of the user browser.
 *
 * @param {string} hdr The string of accpet-language header
 * @return {Array} Array of language-quality pairs
 */
function getParsedAcceptLangs(hdr) {
  var pairs = hdr.split(',');
  var result = [];
  for (var i=0; i < pairs.length; i++) {
    var pair = pairs[i].split(';');
    if (pair.length == 1) result.push( [pair[0], '1'] );
    else result.push( [pair[0], pair[1].split('=')[1] ] );
  }
  return result;
}