端午节放假了,饱食终日,无所事事,用solidity写了个以太坊代币,于是离骚币诞生了,纪念屈原,今年不仅仅是读一遍离骚了。
代码地址:https://etherscan.io/address/0x9a5dcd4348549d719813431f10fbb6d1c1758d83#code
代币地址:https://etherscan.io/token/0x9a5dcd4348549d719813431f10fbb6d1c1758d83
这里也贴一份:
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
防止整数溢出问题
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract StandardToken {
//使用SafeMath
using SafeMath for uint256;
//代币名称
string public name;
//代币缩写
string public symbol;
//代币小数位数(一个代币可以分为多少份)
uint8 public decimals;
//代币总数
uint256 public totalSupply;
//交易的发起方(谁调用这个方法,谁就是交易的发起方)把_value数量的代币发送到_to账户
function transfer(address _to, uint256 _value) public returns (bool success);
//从_from账户里转出_value数量的代币到_to账户
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
//交易的发起方把_value数量的代币的使用权交给_spender,然后_spender才能调用transferFrom方法把我账户里的钱转给另外一个人
function approve(address _spender, uint256 _value) public returns (bool success);
//查询_spender目前还有多少_owner账户代币的使用权
function allowance(address _owner, address _spender) public constant returns (uint256 remaining);
//转账成功的事件
event Transfer(address indexed _from, address indexed _to, uint256 _value);
//使用权委托成功的事件
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
//设置代币控制合约的管理员
contract Owned {
// modifier(条件),表示必须是权力所有者才能do something,类似administrator的意思
modifier onlyOwner() {
require(msg.sender == owner);
_;//do something
}
//权力所有者
address public owner;
//合约创建的时候执行,执行合约的人是第一个owner
constructor() public {
owner = msg.sender;
}
//新的owner,初始为空地址,类似null
address newOwner=0x0;
//更换owner成功的事件
event OwnerUpdate(address _prevOwner, address _newOwner);
//现任owner把所有权交给新的owner(需要新的owner调用acceptOwnership方法才会生效)
function changeOwner(address _newOwner) public onlyOwner {
require(_newOwner != owner);
newOwner = _newOwner;
}
//新的owner接受所有权,权力交替正式生效
function acceptOwnership() public{
require(msg.sender == newOwner);
emit OwnerUpdate(owner, newOwner);
owner = newOwner;
newOwner = 0x0;
}
}
//代币的控制合约
contract Controlled is Owned{
//创世vip
constructor() public {
setExclude(msg.sender,true);
}
// 控制代币是否可以交易,true代表可以(exclude里的账户不受此限制,具体实现在下面的transferAllowed里)
bool public transferEnabled = true;
// 是否启用账户锁定功能,true代表启用
bool lockFlag=true;
// 锁定的账户集合,address账户,bool是否被锁,true:被锁定,当lockFlag=true时,恭喜,你转不了账了,哈哈
mapping(address => bool) locked;
// 拥有特权用户,不受transferEnabled和lockFlag的限制,vip啊,bool为true代表vip有效
mapping(address => bool) exclude;
//设置transferEnabled值
function enableTransfer(bool _enable) public onlyOwner returns (bool success){
transferEnabled=_enable;
return true;
}
//设置lockFlag值
function disableLock(bool _enable) public onlyOwner returns (bool success){
lockFlag=_enable;
return true;
}
// 把_addr加到锁定账户里,拉黑名单。。。
function addLock(address _addr) public onlyOwner returns (bool success){
require(_addr!=msg.sender);
locked[_addr]=true;
return true;
}
//设置vip用户
function setExclude(address _addr,bool _enable) public onlyOwner returns (bool success){
exclude[_addr]=_enable;
return true;
}
//解锁_addr用户
function removeLock(address _addr) public onlyOwner returns (bool success){
locked[_addr]=false;
return true;
}
//控制合约 核心实现
modifier transferAllowed(address _addr) {
if (!exclude[_addr]) {
require(transferEnabled,"transfer is not enabeled now!");
if(lockFlag){
require(!locked[_addr],"you are locked!");
}
}
_;
}
}
//端午节,代币离骚
contract LiSaoToken is StandardToken,Controlled {
//账户集合
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) internal allowed;
constructor() public {
totalSupply = 1000000000;//10亿
name = "LiSao Token";
symbol = "LS";
decimals = 0;
balanceOf[msg.sender] = totalSupply;
}
function transfer(address _to, uint256 _value) public transferAllowed(msg.sender) returns (bool success) {
require(_to != address(0));
require(_value <= balanceOf[msg.sender]);
balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public transferAllowed(_from) returns (bool success) {
require(_to != address(0));
require(_value <= balanceOf[_from]);
require(_value <= allowed[_from][msg.sender]);
balanceOf[_from] = balanceOf[_from].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool success) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
function name() view returns (string name)你的代码里咋没写呢?因为我定义了 string public name,而public的公共变量name,会自动生成一个返回name的name()的方法,所以我不用重复写function name()了,其它几个变量也是一样的