代币演示合约

token.sol

pragma solidity ^0.4.16;

interface tokenRecipient { function receiveApproval (address _from, uint256 _value, address _token, bytes _extraData) external; }

contract FangTangCoin {
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    uint256 public totalSupply;
    address private creator;

    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    event Transfer(address indexed from, address indexed to, uint256 value);


    function FangTangCoin(
        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
        name = tokenName;                                   // Set the name for display purposes
        symbol = tokenSymbol;                               // Set the symbol for display purposes
        creator = msg.sender;
    }

    function _transfer(address _from, address _to, uint _value) internal {
        require(_to != 0x0);
        require(balanceOf[_from] >= _value);
        require(balanceOf[_to] + _value > balanceOf[_to]);
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     // Check allowance
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        return true;
    }
    
    function buyToken() public payable returns (bool success){
        
    uint256 weiAmount = msg.value;
    uint256 tokens;
    uint rate = 1000;
    tokens = weiAmount * ( 10 ** uint256(decimals)/ 1000000000000000000 ) * rate ;
        
    require(tokens > 0);  
      
    _transfer(creator , msg.sender, tokens);
    return true;
    }   
    
    function getETH() public 
    {
       require(address(this).balance > 0 && msg.sender == creator);
         creator.transfer(address(this).balance);
    
    } 



}