项目地址：https://www.trufflesuite.com/boxes/tutorialtoken

项目结构

• package.json配置文件

{
  "#name": "定义项目的名称，版本",
  "name": "tutorialtoken",
  "version": "1.0.0",
  "description": "",
  "main": "truffle-config.js",
  "directories": {
    "test": "test"
  },
  "#scripts": "定义可执行的脚本，在执行项目的时候npm run dev，这个dev取决于配置的这个名字",
  "scripts": {
    "//":"lite-server,可以用来搭建本地server服务器，默认读取bs-config.json文件",
    "dev": "lite-server",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "#lite-server": "lite-server,可以用来搭建本地server服务,默认读取bs-config.json",
    "lite-server": "^2.3.0"
  }
}

• bs-config.json配置文件

{
  "//":"将端口变为4000",
  "port":"4000",
  "server": {
    "baseDir": ["./src", "./build/contracts"]
  }
}

• app.js

  //APP就是一个json对象，里面定义所有逻辑和待调用的函数;
  App = {
    //定义了两个变量
    web3Provider: null,//合约要连接的私有链或者公有链的地址
    contracts: {},//合约的实例
  //定义了一个初始化函数
    //  页面生成后执行init对象
    init: function() {
      return App.initWeb3();
    },
  //实例化了web3js 对象
    initWeb3: function() {
      // Initialize web3 and set the provider to the testRPC.
      if (typeof web3 !== 'undefined') {
        //上个语句的意思就是，当前有私有链就返回私有链的信息
        App.web3Provider = web3.currentProvider;//查看当前连接的哪条私有链
      } else {
        // 来手动连接要连接的私有链地址
        App.web3Provider = new Web3.providers.HttpProvider('http://127.0.0.1:9545');
      }
        //创建web3对象，才能调用web3 api
      web3 = new Web3(web3.currentProvider);
      return App.initContract();
    },
  //初始化智能合约
    initContract: function() {
      //获取json格式的文件 缺少TutorialToken.sol
      $.getJSON('TutorialToken.json', function(data) {
        // Get the necessary contract artifact file and instantiate it with truffle-contract.
        var TutorialTokenArtifact = data;
        //获取json文件中的合约名称
        App.contracts.TutorialToken = TruffleContract(TutorialTokenArtifact);
  
        // Set the provider for our contract.
        App.contracts.TutorialToken.setProvider(App.web3Provider);
  
        // Use our contract to retieve and mark the adopted pets.
        return App.getBalances();
      });
  
      return App.bindEvents();
    },
  //绑定前端的事件
    bindEvents: function() {
      $(document).on('click', '#transferButton', App.handleTransfer);
    },
  //实现转账功能
    handleTransfer: function(event) {
      event.preventDefault();
      //获取目标账户和转账金额
      var amount = parseInt($('#TTTransferAmount').val());
      var toAddress = $('#TTTransferAddress').val();
  
      console.log('Transfer ' + amount + ' TT to ' + toAddress);
  
      //存储实例化的合约
      var tutorialTokenInstance;
  
      web3.eth.getAccounts(function(error, accounts) {
        if (error) {
          console.log(error);
        }
        //默认第一个账户
        var account = accounts[0];
  
        //通过合约名词实例化智能合约
        App.contracts.TutorialToken.deployed().then(function(instance) {
          tutorialTokenInstance = instance;
          //补充transfer函数 转账
          return tutorialTokenInstance.transfer(toAddress, amount, {from: account, gas: 100000});
        }).then(function(result) {
          alert('Transfer Successful!');
          return App.getBalances();
        }).catch(function(err) {
          console.log(err.message);
        });
      });
    },
  //查询余额
    getBalances: function() {
      console.log('Getting balances...');
  
      var tutorialTokenInstance;
  
      web3.eth.getAccounts(function(error, accounts) {
        if (error) {
          console.log(error);
        }
  
        var account = accounts[0];
  
        App.contracts.TutorialToken.deployed().then(function(instance) {
          tutorialTokenInstance = instance;
          //补充balanceOf函数 余额查询
          return tutorialTokenInstance.balanceOf(account);
        }).then(function(result) {
          console.info(result);
          balance = result.c[0];
  
          $('#TTBalance').text(balance);
        }).catch(function(err) {
          console.log(err.message);
        });
      });
    }
  
  };
  
  $(function() {
    $(window).load(function() {
      App.init();
    });
  });
  
  

• OpenZeppelin

C:\Users\28694\Desktop\token\token>cnpm install openzeppelin-solidity

在 /contracts 目录下创建 TutorialToken.sol

pragma solidity ^0.5.0;

import 'openzeppelin-solidity/contracts/token/ERC20/ERC20.sol';

// 使用is 來繼承ERC20合約
contract TutorialToken is ERC20 {

    string public name = 'TutorialToken';
    // 代币符号
    string public symbol = 'TT';
    //代币精度
    uint public decimals = 2;
    // 发行代币的总数量
    uint public INITIAL_SUPPLY = 12000;

    //构造函数
    construct() public {
      _mint(msg.sender,INITIAL_SUPPLY);
    }

    function () {
      totalSupply = INITIAL_SUPPLY;
      balances[msg.sender] = INITIAL_SUPPLY;
    }
}

创建迁移文件 2_initial_migration.js

var TutorialToken = artifacts.require("TutorialToken");

module.exports = function(deployer) {
  deployer.deploy(TutorialToken);
};

部署操作

C:\Users\28694\Desktop\token\token>truffle develop
C:\Users\28694\Desktop\token\token>migrate

报错

truffle(develop)> deploy --reset

Compiling your contracts...
===========================
> Compiling .\contracts\Migrations.sol
> Compiling .\contracts\TutorialToken.sol
> Compiling openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

openzeppelin-solidity/contracts/token/ERC20/ERC20.sol:85:45: ParserError: Expected '{' but got reserved keyword 'override'
    function decimals() public view virtual override returns (uint8) {
                                            ^------^

Compilation failed. See above.

openzeppelin版本问题 重新安装2.0.0版本(未解决)