第76篇 Faucet 智能合约

Posted 2021-07-26 wonderBlock

Faucet 在以太坊网络称为水龙头，它向任何提出申请的地址发送底层币。

1. faucet1.sol

pragma solidity ^0.4.19;

contract Faucet {   
	// Give out ether to anyone who asks
	function withdraw(uint withdraw_amount) public {              // 提币函数
		// Limit withdrawal amount
		require(withdraw_amount <= 100000000000000000);           // 每次限额
		// Send the amount to the address that requested it
		msg.sender.transfer(withdraw_amount);                     // 发币
	}
	
	// Accept any incoming amount
	function() public payable {                                   // 回退函数，可以接收底层币
   }
}

2. faucet2.sol

升级版合约：

pragma solidity ^0.8.0;

contract Faucet {	
	function withdraw(uint withdraw_amount) public {		
		require(withdraw_amount <= 100000000000000000);
		payable(msg.sender).transfer(withdraw_amount);
	}

    fallback() payable external {}
    receive() payable external {}

}

本文合约在 remix 编译部署通过，仅供参考。