function isHan(unicode) {
  return  codeInBlock(unicode, 'CJK Radicals Supplement') 
      ||  codeInBlock(unicode, 'Kangxi Radicals')
      ||  codeInBlock(unicode, 'CJK Strokes')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs Extension A')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs')
      ||  codeInBlock(unicode, 'CJK Compatibility Ideographs')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs Extension B')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs Extension C')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs Extension D')
      ||  codeInBlock(unicode, 'CJK Unified Ideographs Extension E');
}
Check if the character code is a Han character
@param { number } unicode 
@returns { boolean }