Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var hasTrimRight = !! String.prototype.trimRight;
    
    function isBlankWithNativeTrimRight(string) {
      if (string === '') {
        return true;
      }
    
      // I assume this is faster, if it exists
      if (hasTrimRight && string.trimRight() === '') {
        return true;
      }
    
      // matches most space or empty characters (including some unicode whitespace characters)
      if (string.match(/^[ \t\r\n\u00A0\u2000-\u200B]+$/)) {
        return true;
      }
    
      return false;
    }
    
    var hasTrim = !! String.prototype.trim;
    
    function isBlankWithNativeTrim(string) {
      if (string === '') {
        return true;
      }
    
      // I assume this is faster, if it exists
      if (hasTrim && string.trim() === '') {
        return true;
      }
    
      // matches most space or empty characters (including some unicode whitespace characters)
      if (string.match(/^[ \t\r\n\u00A0\u2000-\u200B]+$/)) {
        return true;
      }
    
      return false;
    }
    
    function isBlankNoNative(string) {
      if (string === '') {
        return true;
      }
    
      if (string.match(/^[ \t\r\n\u00A0\u2000-\u200B]+$/)) {
        return true;
      }
    
      return false;
    }
    
    var strIsBlank = (function() {
      if ( !! String.prototype.trim) {
        return function(string) {
          if (string === '' || string.trim() === '') {
            return true;
          }
    
          return false;
        };
      }
    
      return function(string) {
        // matches most space or empty characters (including some unicode whitespace characters)
        if (string === '' || string.match(/^[ \t\r\n\u00A0\u2000-\u200B]+$/)) {
          return true;
        }
    
        return false;
      };
    })();
  };
</script>

Test runner

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isBlankWithNativeTrimRight('');
isBlankWithNativeTrimRight(' ');
isBlankWithNativeTrimRight('    '); // includes unicode   character

isBlankNoNative('');
isBlankNoNative(' ');
isBlankNoNative('    '); // includes unicode   character

isBlankWithNativeTrim('');
isBlankWithNativeTrim(' ');
isBlankWithNativeTrim('    ');

strIsBlank('');
strIsBlank(' ');
strIsBlank('    ');

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