3_deploy_Uniswap.js

const UniswapV2Factory = artifacts.require("UniswapV2Factory");
const UniswapV2Router02 = artifacts.require("UniswapV2Router02");
const WETH9 = artifacts.require("WETH9");

const weth = {
  mainnet: '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2',
  ropsten: '0xc778417E063141139Fce010982780140Aa0cD5Ab',
  rinkeby: '0xc778417E063141139Fce010982780140Aa0cD5Ab',
  goerli: '0xB4FBF271143F4FBf7B91A5ded31805e42b2208d6',
  kovan: '0xd0A1E359811322d97991E03f863a0C30C2cF029C',
  ganache: ''
}

module.exports = function (deployer, network, accounts) {
  // 布署Uniswap工厂合约
  deployer.deploy(UniswapV2Factory,
    accounts[0] //feeToSetter地址
  ).then(async (UniswapV2FactoryInstance) => {
    console.log(await UniswapV2FactoryInstance.pairCodeHash())
    if(network == 'ganache'){
      const WETH9Instance = await deployer.deploy(WETH9);
      weth.ganache = WETH9Instance.address;
    }
    return deployer.deploy(UniswapV2Router02,
      UniswapV2FactoryInstance.address, //Uniswap工厂合约地址
      weth[network], //weth地址
    );
  });
};