Contract Source Code:
File 1 of 1 : FOMOWINNER
// 定义语言和版本
pragma solidity ^0.4.16;
// 调用人合约
contract owned {
//地址
address public owner;
constructor () public {
owner = msg.sender;
}
//必须是自己
modifier onlyOwner {
require(msg.sender == owner);
_;
}
//转移所有权
function transferOwnership(address newOwner) onlyOwner public {
owner = newOwner;
}
}
// 定义令牌接收接口
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }
// 合约主要逻辑
contract TokenERC20 {
// Public variables of the token
// 令牌的公共变量
// 令牌的名称
string public name;
// 令牌的标识
string public symbol;
// 18 decimals is the strongly suggested default, avoid changing it
// 强烈建议18位小数
uint8 public decimals = 18;
// 总供应量
uint256 public totalSupply;
// This creates an array with all balances
// 创建一个map保存所有代币持有者的余额
mapping (address => uint256) public balanceOf;
// 地址配额
mapping (address => mapping (address => uint256)) public allowance;
// This generates a public event on the blockchain that will notify clients
// 这将在区块链上生成将通知客户的公共事件
event Transfer(address indexed from, address indexed to, uint256 value);
// This generates a public event on the blockchain that will notify clients
// 这将在区块链上生成将通知客户的公共事件
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
// This notifies clients about the amount burnt
// 通知客户销毁的总量
event Burn(address indexed from, uint256 value);
/**
* Constrctor function
* 构造函数
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
constructor ( uint256 initialSupply, string tokenName, string tokenSymbol ) public {
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens 给令牌创建者所有初始化的数量
name = tokenName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
}
/**
* Internal transfer, only can be called by this contract
* 内部转账，私有函数，内部调用
*/
function _transfer( address _from, address _to, uint _value ) internal {
// Prevent transfer to 0x0 address. Use burn() instead
// 检查地址格式
require(_to != 0x0);
// Check if the sender has enough
// 检查转账者是否有足够token
require(balanceOf[_from] >= _value);
// Check for overflows
// 检查是否超过最大量
require(balanceOf[_to] + _value > balanceOf[_to]);
// Save this for an assertion in the future
uint previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
// 转出人减少
balanceOf[_from] -= _value;
// Add the same to the recipient
// 转入人增加
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
// 该断言用于使用静态分析来查找代码中的错误，他们永远不应该失败
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
/**
* Transfer tokens
* 转账
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer( address _to, uint256 _value ) public returns (bool success) {
//这里注意发送者就是合约调用者
_transfer(msg.sender, _to, _value);
return true;
}
/**
* Transfer tokens from other address
* 从另一个地址转移一定配额的token
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom( address _from, address _to, uint256 _value ) public returns (bool success) {
require(_value <= allowance[_from][msg.sender]); // Check allowance 检查从from地址中转移一定配额的token到to地址
allowance[_from][msg.sender] -= _value; //转入地址的数量减少
_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
* 设置配额给其他地址
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve( address _spender, uint256 _value) public returns (bool success) {
allowance[msg.sender][_spender] = _value; //调用地址给指定地址一定数量的配额
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* Set allowance for other address and notify
* 设置配额给其他地址，并且触发
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
* @param _extraData some extra information to send to the approved contract
*/
function approveAndCall( address _spender, uint256 _value, bytes _extraData ) public returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/**
* Destroy tokens
* 销毁令牌
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough 检查销毁地址余额
balanceOf[msg.sender] -= _value; // Subtract from the sender 账户里减少
totalSupply -= _value; // Updates totalSupply 总供应量减少
emit Burn(msg.sender, _value); // 销毁
return true;
}
/**
* Destroy tokens from other account
* 从指定账户销毁令牌
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender 地址
* @param _value the amount of money to burn 数量
*/
function burnFrom(address _from, uint256 _value) public returns (bool success) {
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough 检查余额
require(_value <= allowance[_from][msg.sender]); // Check allowance 检查配额
balanceOf[_from] -= _value; // Subtract from the targeted balance
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
totalSupply -= _value; // Update totalSupply 总供应量减少
emit Burn(_from, _value); // 销毁
return true;
}
}
/******************************************/
/* ADVANCED TOKEN STARTS HERE */
/******************************************/
// 高级版本
contract FOMOWINNER is owned, TokenERC20 {
// 销售价格
uint256 public sellPrice;
// 购买价格
uint256 public buyPrice;
// 定义冻结账户
mapping (address => bool) public frozenAccount;
/* This generates a public event on the blockchain that will notify clients */
// 冻结消息通知
event FrozenFunds(address target, bool frozen);
/* Initializes contract with initial supply tokens to the creator of the contract */
// 构造
constructor ( uint256 initialSupply, string tokenName, string tokenSymbol ) TokenERC20(initialSupply, tokenName, tokenSymbol) public {}
/* Internal transfer, only can be called by this contract */
// 转账，内部私有函数
function _transfer( address _from, address _to, uint _value ) internal {
require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead 检查转账地址格式
require (balanceOf[_from] >= _value); // Check if the sender has enough 检查转出地址余额
require (balanceOf[_to] + _value >= balanceOf[_to]); // Check for overflows 检查转入金额不能为负
require(!frozenAccount[_from]); // Check if sender is frozen 转出地址不在冻结账户中
require(!frozenAccount[_to]); // Check if recipient is frozen 转入地址不在冻结账户中
balanceOf[_from] -= _value; // Subtract from the spender 转出地址减少
balanceOf[_to] += _value; // Add the same to the recipient 转入地址增加
emit Transfer(_from, _to, _value);
}
/// @notice Create `mintedAmount` tokens and send it to `target`
/// @param target Address to receive the tokens
/// @param mintedAmount the amount of tokens it will receive
/// 蒸发
function mintToken( address target, uint256 mintedAmount ) onlyOwner public {
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
emit Transfer(0, this, mintedAmount);
emit Transfer(this, target, mintedAmount);
}
/// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens
/// @param target Address to be frozen
/// @param freeze either to freeze it or not
/// 冻结账户
function freezeAccount( address target, bool freeze ) onlyOwner public {
frozenAccount[target] = freeze;
emit FrozenFunds(target, freeze);
}
/// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth
/// @param newSellPrice Price the users can sell to the contract
/// @param newBuyPrice Price users can buy from the contract
/// 设置价格，针对eth
function setPrices( uint256 newSellPrice, uint256 newBuyPrice ) onlyOwner public {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}
/// @notice Buy tokens from contract by sending ether
/// 从合约中购买令牌
function buy() payable public {
uint amount = msg.value / buyPrice; // calculates the amount 计算收到的eth能换多少token
_transfer(this, msg.sender, amount); // makes the transfers token转账
}
/// @notice Sell `amount` tokens to contract
/// @param amount amount of tokens to be sold
/// 向合约卖出令牌
function sell(uint256 amount) public {
address myAddress = this;
require(myAddress.balance >= amount * sellPrice); // checks if the contract has enough ether to buy 检查合约地址是否有足够的eth
_transfer(msg.sender, this, amount); // makes the transfers token转账
msg.sender.transfer(amount * sellPrice); // sends ether to the seller. It's important to do this last to avoid recursion attacks 向对方发送eth
}
}