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S_47_IERC20.sol 3.13 KB
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GKing 提交于 2022-11-16 16:21 +08:00 . debug 接受者增加数量
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
/**
* 合约包含IERC20接口,代表满足标准
*/
interface IERC20 {
/**
* 当前合约的 token 总量
*/
function totalSupply() external view returns (uint);
/**
* 某一个账户的当前余额
*/
function balanceOf(address account) external view returns (uint);
/**
* 把账户中的余额,由调用者发送到另一个账户中,并向链外汇报事件
*/
function transfer(address recipient, uint amount) external returns (bool);
/**
* 查询某账户向另一账户批准额度有多少
*/
function allowance(address owner, address spender) external view returns (uint);
/**
* 把账户中的数量批准给另一个账户
*/
function approve(address spender, uint amount) external returns (bool);
/**
* 向另一个合约存款的时候,另一个合约需要调用 transferFrom 把token拿到它的合约中
*/
function transferFrom(address sender, address recipient, uint amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint amount);
event Approval(address indexed owner, address indexed spender, uint amount);
}
contract ERC20 is IERC20 {
// 当前合约的token总量
uint public totalSupply;
// 账本映射
mapping(address => uint) public balanceOf;
// 批准映射
mapping(address => mapping(address => uint)) public allowance;
// token name
string public name = "Test";
string public symbol = "TEST";
// token 精度
uint8 public decimals = 18;
/**
* 把账户中的余额,由调用者发送到另一个账户中,并向链外汇报事件
*/
function transfer(address recipient, uint amount) external returns (bool) {
// 发送者减掉数量
balanceOf[msg.sender] -= amount;
// 接受者增加数量
balanceOf[recipient] += amount;
emit Transfer(msg.sender, recipient, amount);
return true;
}
/**
* 把账户中的数量批准给另一个账户
*/
function approve(address spender, uint amount) external returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
/**
* 向另一个合约存款的时候,另一个合约需要调用 transferFrom 把token拿到它的合约中
*/
function transferFrom(address sender, address recipient, uint amount) external returns (bool) {
allowance[sender][msg.sender] -= amount;
balanceOf[sender] -= amount;
balanceOf[recipient] += amount;
emit Transfer(sender, recipient, amount);
return true;
}
/**
* 筑币方法
*/
function mint(uint amount) external {
balanceOf[msg.sender] += amount;
totalSupply += amount;
emit Transfer(address(0), msg.sender, amount);
}
/**
* 销毁方法
*/
function burn(uint amount) external {
balanceOf[msg.sender] -= amount;
totalSupply -= amount;
emit Transfer(msg.sender, address(0), amount);
}
}
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