这是一个示例合约，它有两个发出“TransferReceived”和“TransferSent”的函数。

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;

contract Sample {

    event TransferReceived(address sender, uint amount);
    event TransferSent(address sender, uint amount);

    function SendTransfer() public payable{
        emit TransferSent(msg.sender, msg.value);
    }

    function ReceiveTransfer(uint amount) public {
        emit TransferReceived(msg.sender, amount);        
    }
 }

这是一段Javascript代码，用于监听样本合约上的两个事件。

const contractAddress = process.env.CONTRACT_ADDRESS;
const provider = new ethers.providers.WebSocketProvider(process.env.WEB_SOCKET);

const contract = new ethers.Contract(contractAddress, abi, provider);

export async function handleEvents() {
    contract.on("TransferReceived", async (sender, amount,event) => {
        //Do Something 
    })

    contract.on("TransferSent", async (sender, amount, event) => {
      //Do something
    });
  }

您可以从Alchemy或Infura等节点提供者那里获得WebSocket URL。