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我尝试通过 Truffle 向 Ganache 发送原始交易。错误消息“Object.exports.toBuffer 的类型无效”。

这是代码：

const Tx = require('ethereumjs-tx').Transaction;
const privateKey = Buffer.from('5b58ae3fe5bf48d05f0a94c87a28fb480ec2bc200a4423ab42ea9557f3617743', 'hex');

const payment_usercashTx = {
    nonce: myAsyncNonceFunction(),
    gasPrice: web3.utils.toHex(25000),
    gasLimit: web3.utils.toHex(10e9),
    to: '0x107180312267DB452930731EA475187BdD4948DB',
    from: web3.eth.defaultAccount,
    value: '0x00',
    data: encode_usercash
}

let usercashTx = new Tx(payment_usercashTx);
usercashTx.sign(privateKey);

let usercash_serializedTx = usercashTx.serialize();

web3.eth.sendSignedTransaction('0x' + usercash_serializedTx.toString('hex'))
.on('receipt', console.log);

新消息：

Error: invalid type
    at Object.exports.toBuffer (/Users/yuha/Desktop/blockchainProject/Kidari/node_modules/ethereumjs-util/dist/bytes.js:97:19)
    at Transaction.setter [as nonce] (/Users/yuha/Desktop/blockchainProject/Kidari/node_modules/ethereumjs-util/dist/object.js:43:25)
    at /Users/yuha/Desktop/blockchainProject/Kidari/node_modules/ethereumjs-util/dist/object.js:96:38
    at Array.forEach (<anonymous>)
    at Object.exports.defineProperties (/Users/yuha/Desktop/blockchainProject/Kidari/node_modules/ethereumjs-util/dist/object.js:94:20)
    at new Transaction (/Users/yuha/Desktop/blockchainProject/Kidari/node_modules/ethereumjs-tx/dist/transaction.js:127:27)
    at Object.<anonymous> (/Users/yuha/Desktop/blockchainProject/Kidari/routes/payment.js:72:18)
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