code: function writeSubTable0(writer, unicodes) {
  
              writer.writeUint16(0); // format
              writer.writeUint16(262); // length
              writer.writeUint16(0); // language
  
              // Array of unicodes 0..255
              var i = -1;
              var unicode;
              while ((unicode = unicodes.shift())) {
                  while (++i < unicode[0]) {
                      writer.writeUint8(0);
                  }
  
                  writer.writeUint8(unicode[1]);
                  i = unicode[0];
              }
  
              while (++i < 256) {
                  writer.writeUint8(0);
              }
  
              return writer;
          }
docs: 创建`子表0`
  
  @param {Writer} writer 写对象
  @param {Array} unicodes unicodes列表
  @return {Writer}