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我正在尝试与 nodejs 交换令牌，但此代码不起作用并返回此错误：

var 错误 = 新错误（消息）；^

错误：下溢（故障=“下溢”，操作=“BigNumber.from”，值=0.1，代码=NUMERIC_FAULT，版本=大数字/5.0.15）

当我在第 41 行更改金额时，它返回一个不同的错误：

错误：意外的服务器响应：302

const ethers = require('ethers');

const addresses = {
  WBNB: '0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c',
  factory: '0x196a03f90b9742f2dcbee3c3c0e6579def219728',
  router: '0x10ED43C718714eb63d5aA57B78B54704E256024E',
  recipient: '0xFa722bA470728e1c40C27c45435D2E12CaB5e7d3'
}

//First address of this mnemonic must have enough BNB to pay for tx fess
const mnemonic = 'my mnemonic password';

const provider = new ethers.providers.WebSocketProvider('https://rpc.ankr.com/bsc');
const wallet = ethers.Wallet.fromMnemonic(mnemonic);
const account = wallet.connect(provider);
const factory = new ethers.Contract(
  addresses.factory,
  ['event PairCreated(address indexed token0, address indexed token1, address pair, uint)'],
  account
);
const router = new ethers.Contract(
  addresses.router,
  [
    'function getAmountsOut(uint amountIn, address[] memory path) public view returns (uint[] memory amounts)',
    'function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts)'
  ],
  account
);

const wbnb = new ethers.Contract(
  addresses.WBNB,
  [
    'function approve(address spender, uint amount) public returns(bool)',
  ],
  account
);

const init = async () => {
  const tx = await wbnb.approve(
    router.address, 
    0.1
  );
  const receipt = await tx.wait(); 
  console.log('Transaction receipt');
  console.log(receipt);
}

factory.on('PairCreated', async (token0, token1, pairAddress) => {
  console.log(`
    New pair detected
    =================
    token0: ${token0}
    token1: ${token1}
    pairAddress: ${pairAddress}
  `);

  //The quote currency needs to be WBNB (we will pay with WBNB)
  let tokenIn, tokenOut;
  if(token0 === addresses.WBNB) {
    tokenIn = token0; 
    tokenOut = token1;
  }

  if(token1 == addresses.WBNB) {
    tokenIn = token1; 
    tokenOut = token0;
  }

  //The quote currency is not WBNB
  if(typeof tokenIn === 'undefined') {
    return;
  }

  //We buy for 0.1 BNB of the new token
  //ethers was originally created for Ethereum, both also work for BSC
  //'ether' === 'bnb' on BSC
  const amountIn = ethers.utils.parseUnits('0.1', 'ether');
  const amounts = await router.getAmountsOut(amountIn, [tokenIn, tokenOut]);
  //Our execution price will be a bit different, we need some flexbility
  const amountOutMin = amounts[1].sub(amounts[1].div(10));
  console.log(`
    Buying new token
    =================
    tokenIn: ${amountIn.toString()} ${tokenIn} (WBNB)
    tokenOut: ${amounOutMin.toString()} ${tokenOut}
  `);
  const tx = await router.swapExactTokensForTokens(
    amountIn,
    amountOutMin,
    [tokenIn, tokenOut],
    addresses.recipient,
    Date.now() + 1000 * 60 * 10 //10 minutes
  );
  const receipt = await tx.wait(); 
  console.log('Transaction receipt');
  console.log(receipt);
});

init();
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