btc转账费用计算 fee

btc转账费用计算：

getBtcTransferFee(int inputNum,int outputNum,double feeRate){
  var feeBasic = (148 * inputNum) + (34 * outputNum) + 10;
  var fee = feeBasic * feeRate;
  return fee;
}

校验网站：https://www.buybitcoinworldwide.com/fee-calculator/