通过学习,自己模拟仿写了一个众筹的智能合约代码。内容还不够完善,只完成了投资和取款操作。

//SPDX-License-Identifier: SimPL-2.0pragma solidity >=0.7.0 <0.8.9;contract zhongchou{    //投资者投资记录:投资目标,投资金额    struct toMoney{        address payable addressReceiptor;        uint money;    }    //投资者基本信息:地址,是否被激活,总投资金额,投资次数,映射记录投资记录    struct funder{        address payable addressfunder;        bool isActive;        uint totalMoney;        uint numberGive;        mapping(uint=>toMoney)expMap;    }    //众筹合约:合约创建者,是否被激活,金额总需求,已投资金额,投资人数量,映射记录投资人    struct needMoneyContract{        address payable addressNeeder;        // payable address addressContract;        bool isActive;        uint totalMoney;        uint giveMoney;        uint amountFunder;        mapping (uint=>funder)mapFunder;    }    //众筹发起者:地址,激活状态,需求总金额,已经被投资的金额,发起的众筹的数量,映射记录投资合约    struct needer{        address addressNeeder;        bool isActive;        uint amountMoneyNeed;        uint amountHasFunded;        uint numberContract;        mapping(uint=>needMoneyContract)expMap;    }    //记录众筹合约总数,合约地址(资金池地址)    uint amountContract;    address payable public addressFinance;     //三方数组    mapping(address=>funder)funderMap;    mapping(uint=>needMoneyContract)contractMap;    mapping(address=>needer)neederMap;        constructor(){        addressFinance=payable(msg.sender);    }    //创建一个众筹发起者    function createNeeder()public returns(bool){        //需要判定是否已经被激活        if(neederMap[msg.sender].isActive){            return false;        }        else{            address _addressNeeder=msg.sender;            //0.8.0后不允许直接创建一个包含映射的结构体。需要通过引用的方式,先创建一个storage类型的结构体(与目标是引用关系),再对新变量进行操作即可。            needer storage tmp1=neederMap[_addressNeeder];            tmp1.addressNeeder=_addressNeeder;            tmp1.isActive=true;            tmp1.amountMoneyNeed=0;            tmp1.amountHasFunded=0;            tmp1.numberContract=0;            return true;        }    }        function createContract(        uint _amountMoneyNeed    )public returns(bool){        address _addressNeeder=msg.sender;        uint tmpNum=amountContract++;        needMoneyContract storage tmp2=contractMap[tmpNum];        tmp2.addressNeeder=payable(_addressNeeder);        tmp2.isActive=true;        tmp2.totalMoney=_amountMoneyNeed;        tmp2.giveMoney=0;        tmp2.amountFunder=0;        uint tmpContract=neederMap[_addressNeeder].numberContract++;        neederMap[_addressNeeder].amountMoneyNeed+=_amountMoneyNeed;        needMoneyContract storage tmp3=neederMap[_addressNeeder].expMap[tmpContract];        needMoneyContract storage tmp4=contractMap[tmpNum];        tmp3=tmp4;        return true;    }        function createFunder()public returns(bool){        if(funderMap[msg.sender].isActive){            return false;        }        else{            address _address=msg.sender;            funder storage tmpfund=funderMap[_address];            tmpfund.addressfunder=payable(_address);            tmpfund.isActive=true;            tmpfund.totalMoney=0;            tmpfund.numberGive=0;            return true;        }    }        function donateMoney(        uint money,        uint idContract,        address addressNeeder    ) public payable returns(bool){        require(contractMap[idContract].isActive==true);        require(money==msg.value);        require(contractMap[idContract].addressNeeder==addressNeeder);        // payable address adressDonate=msg.sender;        address tmpfunder=msg.sender;        funderMap[tmpfunder].totalMoney+=money;        toMoney storage tmpMoney=funderMap[tmpfunder].expMap[funderMap[tmpfunder].numberGive];        tmpMoney.addressReceiptor=payable(addressNeeder);        tmpMoney.money=money;        funderMap[tmpfunder].numberGive++;        contractMap[idContract].giveMoney+=money;        funder storage tmpfund1=contractMap[idContract].mapFunder[contractMap[idContract].amountFunder++];        funder storage tmpfund2=funderMap[tmpfunder];        tmpfund1=tmpfund2;        return true;    }        function isComplete(uint idContract)public payable returns(bool){        require(contractMap[idContract].isActive==true);        require(contractMap[idContract].addressNeeder==msg.sender);        require(contractMap[idContract].totalMoney<=contractMap[idContract].giveMoney);        needMoneyContract storage tmptrans=contractMap[idContract];        tmptrans.isActive=false;        address tmpaddr=msg.sender;        uint getMoney=tmptrans.giveMoney;        neederMap[tmpaddr].amountHasFunded+=getMoney;        tmptrans.addressNeeder.transfer(getMoney);        return true;    }}