以太坊ERC20代币合约web3调用

以太坊ERC20代币合约案例之web3调用代码如下所示：
//1.1 导入 编译好的 合约的 字节代码 和 abi
const path = require('path');
const fs = require('fs');
//1.2 合约编译后的文件路径
const bytecodeFilePath = path.resolve(__dirname,'./TokenERC20.bytecode');
const bytecodeJsonStr = fs.readFileSync(bytecodeFilePath,'utf-8');
const byteCodeJsonObj = JSON.parse(bytecodeJsonStr);
//const {bytecode,interface} = require('./compilCaiPiao');
const bytecode = byteCodeJsonObj.bytecode;
const interface = byteCodeJsonObj.interface;

//2.导入 hd钱包provider
const HDWalletProvider = require("truffle-hdwallet-provider");
//3.助记词（相当于是我们的私钥）
const mnemonic = "jar ... cat beef"; // 12 word mnemonic
//4.创建 provider，可以用来访问 以太坊真实网络节点
const provider = new HDWalletProvider(mnemonic, "https://rinkeby.infura.io/v3/3a60f2b160....",1);//最后的0 是获取 助记词 的第1个地址

//5.创建web对象
const Web3 = require('web3');
const web3= new Web3(provider);

async function main(){
    console.log('开始与以太网交互......');
    const usrAdr = await web3.eth.getAccounts();//0x6c57CD10B4384C605aC748937b6cC1dF6C8eddA9
    web3.eth.defaultAccount = usrAdr[0];
    console.log('当前调用者的地址:' + web3.eth.defaultAccount);

    //6.部署合约到 以太网节点
    //let contractObj =await deployContract();

    //7.调用合约
    //7.0 创建 远程智能合约
    const contractObj = await new web3.eth.Contract(JSON.parse(interface),'0x46495b091cd3Fcb789cC336c3B5e9041E28555b0');
    console.log('获取【合约】对象成功!');

    // // 7.1 获取指定地址余额
    await getBalanceAt(contractObj,'0x85BCc0F34718e80c332d41C513B72f8640B05249');
    //await transferTo(contractObj,'0x83E9e99B7f5018680930baE0C7801555C850D9C5',10000000);
    //await approveTo(contractObj,'0x83E9e99B7f5018680930baE0C7801555C850D9C5',1000000000);
    await allowanceAt(contractObj,'0x85BCc0F34718e80c332d41C513B72f8640B05249','0x83E9e99B7f5018680930baE0C7801555C850D9C5');
    await transferFrom(contractObj,'0x85BCc0F34718e80c332d41C513B72f8640B05249','0x737Df786f6e86625258960970c6752Fd7926F752',1);
    await allowanceAt(contractObj,'0x85BCc0F34718e80c332d41C513B72f8640B05249','0x83E9e99B7f5018680930baE0C7801555C850D9C5');
    //await getBalanceAt(contractObj,'0x737Df786f6e86625258960970c6752Fd7926F752');
    // //7.2 显示合约账户余额
    // await showContracMoney(contractObj);
    // //查看调用者购买的号码
    // await showInvokerLuckNum(contractObj);

    // 7.3 开奖+
    // await withdrawLottery(contractObj);

    // 7.4 显示买家账户列表
    // await showUsrList(contractObj);
    // await showContracMoney(contractObj);
    // 7.5 重置数据
    //await resetContract(contractObj);
    //await showManageAddress(contractObj);
    //await killContract(contractObj);


    console.log('结束!');

}

//启动
main();

// 1.部署合约
async function deployContract() {
    console.log('开始部署合约......');
    let contractObj = await new web3.eth.Contract(JSON.parse(interface))
        .deploy({
            data: bytecode,//TokenERC20(uint256 initialSupply, string tokenName, string tokenSymbol)
            arguments: ['1000000000','梦想零钱','DreamCoin']
        }).send({
            from:web3.eth.defaultAccount,
            gas:'1000000'
        });

    console.log('部署成功，合约地址：【'+contractObj.options.address+'】');
    return contractObj;
}

// 2.查询余额
async function getBalanceAt(contractObj,usrAdr) {
    let usrMoney = await contractObj.methods.balanceOf(usrAdr).call();
    console.log('地址【'+usrAdr+'】余额：'+usrMoney);
}

//3.将当前调用者的钱 转 money 金额给 usrAdrTo
async function transferTo(contractObj,usrAdrTo, money) {
    let result = await contractObj.methods.transfer(usrAdrTo,money).send({
        from:web3.eth.defaultAccount,
        gas:'1000000'
    });
    console.log('【'+web3.eth.defaultAccount+'】向【'+usrAdrTo+'】转账【'+money+'】完毕');
    console.log('转账完毕~记录如下：')
    console.log(result);
}

//4.授权（当前调用者授权给 spenderAdr 操作数额为 money 的代币）
async function approveTo(contractObj,spenderAdr, money){
    let result = await contractObj.methods.approve(spenderAdr,money).send({
       from:web3.eth.defaultAccount,
       gas:'1000000'
    });
    console.log('【'+web3.eth.defaultAccount+'】向【'+spenderAdr+'】授权【'+money+'】完毕!');
    //console.log(result);
}

//5.查询授权
async function allowanceAt(contractObj,ownerAdr,spenderAdr) {
    let result = await contractObj.methods.allowance(ownerAdr,spenderAdr).call();
    console.log('查询：【'+ownerAdr+'】给【'+spenderAdr+'】剩余授权余额为：'+result);
}

//6.转账（汇款人地址，收款人地址，金额）
async function transferFrom(contractObj,usrAdrFrom, usrAdrTo, money) {
    let result = await contractObj.methods.transferFrom(usrAdrFrom,usrAdrTo,money).send({
        from:web3.eth.defaultAccount,
        gas:'1000000'
    });
    console.log('【'+usrAdrFrom+'】向【'+usrAdrTo+'】转账【'+money+'】完毕');
    //console.log(result);
}