众筹智能合约

1.ico.sol 需要结合ERC20.sol使用

pragma solidity^0.4.20;

interface token{
    function transfer(address _to,uint256 _account) external ;
}

contract ICO {
    uint public fundingGoal;//众筹目标
    uint public deadline;//众筹时间
    uint public price;//价格
    uint public fundAmount//众筹金额
    token public tokenReward;
    address punlic beneficiary;//受益者
    
    mapping (address => uint ) public balanceOf;
    
    event FundTransfer(address backer,uint amount);
    event GoalReached(bool success); 
    
    //构造函数
    constructor(uint fundingGoalInEthers,uint durationInMinutes,uint etherCostofEachToken,address addressOfToken){
        beneficiary=msg.sender;//受益者
        fundingGoal =fundingGoalInEthers;//众筹目标金额
        deadline =now +durationInMinutes * 1 minutes;//截至时间
        price =etherCostofEachToken * 1 ether; //1ether=10**18wei
        tokenReward=token(addressOfToken);
        
    }  
    //接受
    function () public payable{
        require(now <deadline);
        balanceOf[msg.sender]+=amount;
        fundAmount +=amount;
        uint amount =msg.value;//wei 
        uint tokenAccount=amount / price;
        tokenReward.transfer(msg.sender,tokenAccount);
        emit FundTransfer(msg.sender,amount);
    }
    
    //检查获得的钱
    function checkGoalReached() public {
        require(now >=deadline);
        if(fundAmount>= fundingGoal){
            emit GoalReached(true); 
        }
    }
    
//提钱
    function withdrawal() public {
        require(now >=deadline);
        if (fundAmount>=fundingGoal){
            //众筹金额大于目标众筹金额
            if(beneficiary==msg.sender){
                //受益者获得转账
                beneficiary.transfer(fundAmount);
            }
        }else{
                
            uint amount =balanceOf[msg.sender];
            if(amount >0){
                 //老板提取钱
                msg.sender.transfer(amount);
                balanceOf[msg.sender]=0;
            }
        }
        
    }
    
    
    
    
    
    
    
    
    
}