类型错误：无法读取未定义的属性"eth"

Question

所以我有这个问题，这段代码，似乎不能弄清楚为什么我得到这个错误，当我运行脚本与终端:

(node:30800) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'eth' of undefined

const Web3 = require('web3');
class TransactionChecker{
web3;
account;
constuctor(projectId, account){
this.web3 = new Web3(new Web3.providers.HttpProvider('wss://mainnet.infura.io/ws/v3/' + projectId));
this.account = account.toLowerCase();
}
async checkBlock(){
let block = await this.web3.eth.getBlock('latest');
let number = block.number;
console.log('Searching block ' + number);
if (block != null && block.transactions != null){
for (let txHash of block.transactions){
let tx = await this.web3.eth.getTransaction(txHash);
if (this.account == tx.to.toLowerCase()) {
console.log('Transaction found on block: ' + number);
console.log({address: tx.from, value: this.web3.utils.fromWei(tx.value, 'ether'), timestamp})
}
}
}
}
}
let txChecker = new TransactionChecker('6bad75506d6649428e0e34ba41d51805', '0x9cad169749bBF8a3Fd735B26C21F2C7F4D8c5383');
txChecker.checkBlock();

有谁能更好地理解这一点吗?

Answer 1

您在constuctor中有一个拼写错误，因此this.web3...行从未运行。正确的是constructor

在你的代码有另一个问题，当你使用websocket，你不需要使用HttpProvider只是传递websocket url给web3:

this.web3 = new Web3('wss://mainnet.infura.io/ws/v3/' + projectId);