无头浏览器puppeteer自动调用Dapp交易

自动化调用dapp的方法一种是直接调用合约的方法进行交易，另一种是用无头浏览器通过操作dapp页面进行自动化交易。用到了puppeteer和@chainsafe/dappeteer两个库；
puppeteer：无头浏览器
@chainsafe/dappeteer： 是封装好的在无头浏览器操作MataMask插件的库

以下是示例代码

const puppeteer = require('puppeteer');
const dappeteer = require('@chainsafe/dappeteer');


async function main() {
 // 引入MetaMask
  const browser = await dappeteer.launch(puppeteer, { metamaskVersion: 'v10.8.1' , headless: false});
  const metamask = await dappeteer.setupMetamask(browser);

  // 通过私钥导入账户
  await metamask.importPK('账户私钥')
  // 给MetaMask添加网络
  await metamask.addNetwork({
    networkName: "BSC-Test",
    rpc: "https://data-seed-prebsc-1-s1.binance.org:8545/",
    chainId: 97,
    symbol: "BNB",
    explorer: "https://testnet.bscscan.com/"
  });
  const page = await browser.newPage()
  // 打开dapp的页面
  let info = await page.goto('http://127.0.0.1:5502/dist/index.html')
  // 授权地址操作权限
  await metamask.approve()
  await page.bringToFront()
 let btn = await page.$('#addWhitelistBox .btn');
 await page.$eval('#addWhitelist_account', el => el.value = '0x90a780054f372eEC70dEf3f1C96c1bbcd3a21336');
 await btn.click()
 await metamask.confirmTransaction()
 await browser.close()
}
main();