solidity:简单众筹合约及其调用流程_骗招狗子的博客

函数解释：
newCampaign：创建公司受益人以及筹款目标
contribute：进行捐赠，并将捐赠名单计入结构体
CheckGoalReached：若达到众筹目标，清空amout，并将goal转给受益者

调用次序说明：

合约代码：

pragma solidity ^0.4.11;

contract CrowdFunding{
    
    struct Funder{
        address addr;
        uint amout;
    }
    
    struct Campaign{
        address beneficiary;
        uint fundingGoal;
        uint numFunders;
        uint amount;
        //when initialize the Campaign
        //ignore the mapping
        mapping(uint => Funder) funders;
    }
    
    uint numCampaigns;
    mapping(uint => Campaign) campaigns;
    
    function newCampaign(address beneficiary, uint goal) 
        public returns (uint campaignID){
            campaignID = numCampaigns++;
            campaigns[campaignID] = Campaign(beneficiary, goal, 0, 0);
    }
    
    function contribute(uint campaignID) public payable{
        Campaign storage c = campaigns[campaignID];
        c.funders[c.numFunders++] = Funder(msg.sender, msg.value);
        c.amount += msg.value;
    }
    
    function checkGoalReached(uint campaignID) public returns (bool reached){
        Campaign storage c = campaigns[campaignID];
        if(c.amount < c.fundingGoal)
            return false;
        uint amount = c.amount;
        c.amount = 0;
        c.beneficiary.transfer(amount);
        return true;
    }
}

总结：
模拟众筹