一、安装nodeJs

官网下载地址：https://nodejs.org/en/

二、安装以太坊代码编译环境solc

npm install -g solc

这里也可以使用在线的编译浏览器：http://remix.ethereum.org/，如下图：

image.png

三、安装ganache

ganache是大名鼎鼎的testRPC的前身，很多老的教程还是使用的testRPC，它是一套本地的区块链测试环境

npm -g ganache-cli

四、运行ganache

命令直接输入：ganache-li

image.png

附件remix中的demo代码：

pragma solidity ^0.4.0;
contract Ballot {

struct Voter {
    uint weight;
    bool voted;
    uint8 vote;
    address delegate;
}
struct Proposal {
    uint voteCount;
}

address chairperson;
mapping(address => Voter) voters;
Proposal[] proposals;

/// Create a new ballot with $(_numProposals) different proposals.
function Ballot(uint8 _numProposals) public {
    chairperson = msg.sender;
    voters[chairperson].weight = 1;
    proposals.length = _numProposals;
}

/// Give $(toVoter) the right to vote on this ballot.
/// May only be called by $(chairperson).
function giveRightToVote(address toVoter) public {
    if (msg.sender != chairperson || voters[toVoter].voted) return;
    voters[toVoter].weight = 1;
}

/// Delegate your vote to the voter $(to).
function delegate(address to) public {
    Voter storage sender = voters[msg.sender]; // assigns reference
    if (sender.voted) return;
    while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
        to = voters[to].delegate;
    if (to == msg.sender) return;
    sender.voted = true;
    sender.delegate = to;
    Voter storage delegateTo = voters[to];
    if (delegateTo.voted)
        proposals[delegateTo.vote].voteCount += sender.weight;
    else
        delegateTo.weight += sender.weight;
}

/// Give a single vote to proposal $(toProposal).
function vote(uint8 toProposal) public {
    Voter storage sender = voters[msg.sender];
    if (sender.voted || toProposal >= proposals.length) return;
    sender.voted = true;
    sender.vote = toProposal;
    proposals[toProposal].voteCount += sender.weight;
}

function winningProposal() public constant returns (uint8 _winningProposal) {
    uint256 winningVoteCount = 0;
    for (uint8 prop = 0; prop < proposals.length; prop++)
        if (proposals[prop].voteCount > winningVoteCount) {
            winningVoteCount = proposals[prop].voteCount;
            _winningProposal = prop;
        }
}
}