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复制的现货单币种平衡策略，在火币平台BTC3S_USDT，未修改前遇到交易单精度错误，修改如下：
193： trade('buy', buy_price.toFixed(6), buy_value.toFixed(4), '买入平衡')
194： trade('sell', sell_price.toFixed(6), sell_value.toFixed(4), '卖出平衡')
然后报错：InternalError: bad argument #3 to 'Exchange_Trade' (float64 expected, got string) at <anonymous> (native) at Buy (FILE) at trade (FILE:139) at onTick (FILE:193) at main (FILE:205)
在API文档里发现exchange.Buy(Price, Amount)传递的两个参数，现货单币种平衡策略里面是：
139 id = exchange.Buy(price, amount, msg)
三个参数删掉msg后还是如上报错，感觉是toFixed()用错了，求正确的截取小数点位数的方法
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