区块链 solidity msg.sender.transfer发送给谁

发送给调用者自己，表示将该合约中的自己应有的以太坊退款到发送者自己的账户

address.transfer(amount)

转账一定数量（以wei为单位）的以太币到指定的地址，遇到任何错误都将抛出异常。我们在Faucet例子中使用过这个方法，针对的是msg.sender这个地址，即msg.sender.transfer

精通以太坊8：智能合约与Solidity（2） | 码农家园精通以太坊8：智能合约与Solidity（2）8.1使用Solidity进行编程有关Solidity的完整文档可以在这里访问：https://solidity.readthedocs.io/en/latest。8.2数据...https://www.codenong.com/cs105234539/

如：weth源码

pragma solidity ^0.4.18;

contract WETH9 {

string public name = "Wrapped Ether";

string public symbol = "WETH";

uint8 public decimals = 18;

event Approval(address indexed src, address indexed guy, uint wad);

event Transfer(address indexed src, address indexed dst, uint wad);

event Deposit(address indexed dst, uint wad);

event Withdrawal(address indexed src, uint wad);

mapping (address => uint) public balanceOf;

mapping (address => mapping (address => uint)) public allowance;

function() public payable {

deposit();

}

function deposit() public payable {

balanceOf[msg.sender] += msg.value;

Deposit(msg.sender, msg.value);

}

function withdraw(uint wad) public {

require(balanceOf[msg.sender] >= wad);

balanceOf[msg.sender] -= wad;

msg.sender.transfer(wad);

Withdrawal(msg.sender, wad);

}

function totalSupply() public view returns (uint) {

return this.balance;

}

function approve(address guy, uint wad) public returns (bool) {

allowance[msg.sender][guy] = wad;

Approval(msg.sender, guy, wad);

return true;

}

function transfer(address dst, uint wad) public returns (bool) {

return transferFrom(msg.sender, dst, wad);

}

function transferFrom(address src, address dst, uint wad)

public

returns (bool)

{

require(balanceOf[src] >= wad);

if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {

require(allowance[src][msg.sender] >= wad);

allowance[src][msg.sender] -= wad;

}

balanceOf[src] -= wad;

balanceOf[dst] += wad;

Transfer(src, dst, wad);

return true;

}

}

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