方法 eth_sendTransaction 不存在/在 infura 上不可用

我試圖在 infura 節點上使用 web3.js 將交易發送到簡單的歡迎契約。在這樣做時，我收到了這個錯誤。

throw errors.InvalidResponse(result);
       ^

Error: The method eth_sendTransaction does not exist/is not available 

在網際網路上對這個錯誤進行了大量調查後，我得出結論 infura 不支持這種方法，我們必須離線簽署交易並將原始交易發送到節點。我已經在做同樣的事情了。但不斷收到此錯誤，請幫助我修復此錯誤。這是我的交易簽名程式碼：

const contractFunction = contract.greet({from:web3.eth.defaultAccount},"hello all devs");

const functionAbi = contractFunction.encodeABI();

let estimatedGas;
let nonce;

console.log("Getting gas estimate");

contractFunction.estimateGas({from: account}).then((gasAmount) => {
estimatedGas = gasAmount.toString(16);

console.log("Estimated gas: " + estimatedGas);

web3.eth.getTransactionCount(account).then(_nonce => {
  nonce = _nonce.toString(16);

  console.log("Nonce: " + nonce);
  const txParams = {
    gasPrice: '0x09184e72a000',
    gasLimit: 3000000,
    to: contract_Address,
    data: functionAbi,
    from: account,
    nonce: '0x' + nonce
  };
  const tx = new Tx(txParams);
  signed_tx = web3.eth.account.signTransaction(tx, privateKey)
  tx_hash= web3.eth.sendRawTransaction(signed_tx.rawTransaction)
  tx_receipt = web3.eth.waitForTransactionReceipt(tx_hash)
  //tx.sign(privateKey);
  console.log(tx_receipt)

伙計（這是關於同一件事的第三個問題），如果您對此有疑問，我已經更改了一些方法，請寫下來，不要打開新問題:)

這是新程式碼

var Tx = require('ethereumjs-tx');
const Web3 = require('web3');
const provider = new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/......");
const web3 = new Web3(provider);

const account1 = '.......'; // Your account address 1
//const account2 = '' // Your account address 2
web3.eth.defaultAccount = account1;

const privateKey1 = Buffer.from('.......', 'hex');

const abi = [{"constant":false,"inputs":[{"name":"_greeting","type":"string"}],"name":"greet","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getGreeting","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}];

const contract_Address = "0xcbe74e21b070a979b9d6426b11e876d4cb618daf";

const myContract = new web3.eth.Contract(abi, contract_Address);

const myData = myContract.methods.greet( "hello blockchain devs").encodeABI();

web3.eth.getTransactionCount(account1, (err, txCount) => {
// Build the transaction
 const txObject = {
   nonce:    web3.utils.toHex(txCount),
   to:       contract_Address,
   value:    web3.utils.toHex(web3.utils.toWei('0', 'ether')),
   gasLimit: web3.utils.toHex(2100000),
   gasPrice: web3.utils.toHex(web3.utils.toWei('6', 'gwei')),
   data: myData  
 }
   // Sign the transaction
   const tx = new Tx(txObject);
   tx.sign(privateKey1);

   const serializedTx = tx.serialize();
   const raw = '0x' + serializedTx.toString('hex');

   // Broadcast the transaction
   const transaction = web3.eth.sendSignedTransaction(raw, (err, tx) => {
       console.log(tx)
   });
});

這就是它有效的證明

引用自：https://ethereum.stackexchange.com/questions/70853