编写应用合约之前,先弄清它的逻辑,有助于我们更好的部署合约 

pragma solidity ^0.4.21;

pragma experimental ABIEncoderV2;

contract voter1{

//voter candidate

    //["eilinge", "lin" ,"meimei"]

    //admin 0x4B0897b0513fdC7C541B6d9D7E929C4e5364D2dB

    //0x14723a09acff6d2a60dcdf7aa4aff308fddc160c 2

    //0x583031d1113ad414f02576bd6afabfb302140225 1

    //0xdd870fa1b7c4700f2bd7f44238821c26f7392148 0

    //投票人

    struct Voter{

        uint _voterAddr;

        uint _weight;

        bool _voted;

        address delegate;

    }

    //候选人

    struct Candidate{

        string candidateName;

        uint voterNum;

    }

    address public admin;

    //候选人集合

    Candidate[] public candidates;

    //投票人集合

    mapping(address=>Voter) public voters;

    //添加候选人

    constructor(string[] candidateNames)public{

        admin = msg.sender;

        for(uint i;i<candidateNames.length;i++){

            Candidate memory canNum = Candidate(candidateNames[i],0);

            candidates.push(canNum);

        }

    }

    modifier OnlyAdmin(){

        require(admin == msg.sender);

        _;

    }

    //赋予投票权

    function giveVoteRight(address addr) OnlyAdmin() public{

        if (voters[addr]._weight > 0){

            revert();

        }

        voters[addr]._weight = 1;

    }

    //进行投票

    function vote(uint voteNum) public{

        Voter storage voter = voters[msg.sender];

        if(voter._weight <= 0 || voter._voted ==true){

            revert();

        }

        voter._voted = true;

        voter._voterAddr = voteNum;

        candidates[voteNum].voterNum += voter._weight;

    }

    //设置代理人

    function delegateFunc(address to) public{

        Voter storage voter = voters[msg.sender];

        if(voter._weight <= 0 || voter._voted ==true){

            revert();

        }

        //设置代理人的地址不为空,且不能是自己

        while (voters[to].delegate != address(0) && voters[to].delegate !=msg.sender){

            to = voters[to].delegate;//新代理人地址

        }

        //代理人的地址不能是自己

        require(msg.sender != to);

        voter._voted = true;

        voter.delegate = to;

        //代理人

        Voter storage finalDelegateVoter = voters[to];

        //代理人投过票,则在代理人投票的候选人票数上加上自己的权重

        if(finalDelegateVoter._voted){

            candidates[finalDelegateVoter._voterAddr].voterNum += voter._weight;

        }

        //代理人未投过票,则在代理人权重加上自己的权重

        else{

            finalDelegateVoter._weight += voter._weight;

        }

    }

    //查看谁胜出

    function whoWin() public constant returns(string,uint){

        string winner;

        uint winnerVoteCounts;

        for (uint i;i>candidates.length;i++){

            if (candidates[i].voterNum > winnerVoteCounts){

                winnerVoteCounts = candidates[i].voterNum;

                winner = candidates[i].candidateName;

            }

        }

        return(winner,winnerVoteCounts);

    }

}