code: public OkCoinDepth getDepth(CurrencyPair currencyPair, Integer size) throws IOException {
      size = (size == null || size < 1 || size > 200) ? 200 : size;
      return okCoin.getDepth("1", OkCoinAdapters.adaptSymbol(currencyPair), size);
    }
docs: 获取OKEx币币市场深度
  
  @param currencyPair
  @param size 设置查询数据条数，[1,200]
  @return
  @throws IOException