text: function strcspn (str, mask, start, length) {
    //  discuss at: http://phpjs.org/functions/strcspn/
    // original by: Brett Zamir (http://brett-zamir.me)
    //   example 1: strcspn('abcdefg123', '1234567890');
    //   returns 1: 7
    //   example 2: strcspn('123abc', '1234567890');
    //   returns 2: 3
  
    start = start ? start : 0
    var count = (length && ((start + length) < str.length)) ? start + length : str.length
    strct: for (var i = start, lgth = 0; i < count; i++) {
      for (var j = 0; j < mask.length; j++) {
        if (str.charAt(i)
          .indexOf(mask[j]) !== -1) {
          continue strct
        }
      }++lgth
    }
  
    return lgth
  }
  