code: function ( str ) {
              if ( !str ) return '';
      
              var regAry = $B.object.toArray( this.HTML_CHARACTERS ),
                  reg = new RegExp( '(' + regAry.join('|') + ')', 'g' ),
                  characters = this._htmlChars ? this._htmlChars : this._htmlChars = $B.object.replaceKeyValue( this.HTML_CHARACTERS );
      
              return str.replace( reg, function ( match, capture ) {
                  return characters[capture] || capture;
              });
          }
docs: "<" 태그를 "&lt;" 처럼 변형된 태그 문자열로 반환 (기존 변환된 문자열 유지)
  @param	{String}	str
  @return  {String}