取款模式

// SPDX-License-Identifier: MIT pragma solidity ^0.8.17;

contract WithdrawalContract { address public wealthiest; uint public mostSent; mapping(address => uint) public pendingWithdrawals;

1// 发送的以太坊金额未超过当前最高金额。
2error NotEnoughEther();
3
4constructor() payable {
5    wealthiest = msg.sender;
6    mostSent = msg.value;
7}
8
9function becomeWealthiest() public payable {
10    if (msg.value <= mostSent) revert NotEnoughEther();
11    pendingWithdrawals[wealthiest] += msg.value;
12    wealthiest = msg.sender;
13    mostSent = msg.value;
14}
15
16function withdraw() public {
17    uint amount = pendingWithdrawals[msg.sender];
18    // 在转账前将待退款金额清零，以防止重入攻击
19    pendingWithdrawals[msg.sender] = 0;
20    payable(msg.sender).transfer(amount);
21}

}

// SPDX-License-Identifier: MIT pragma solidity ^0.8.17;

contract SendContract { address payable public wealthiest; uint public mostSent;

1// 发送的以太坊金额未超过当前最高金额。
2error NotEnoughEther();
3
4constructor() payable {
5    wealthiest = payable(msg.sender);
6    mostSent = msg.value;
7}
8
9function becomeWealthiest() public payable {
10    if (msg.value <= mostSent) revert NotEnoughEther();
11    // 此行可能引发问题：若接收方拒绝接收 ETH，transfer 会回滚，导致任何人都无法成为最富有的参与者。
12    wealthiest.transfer(msg.value);
13    wealthiest = payable(msg.sender);
14    mostSent = msg.value;
15}

}