如何使用web3 js在uniswap上交换令牌

npm install web3

const Web3 = require('web3');

const web3 = new Web3('https://rinkeby.infura.io/v3/YOUR_INFURA_PROJECT_ID');

const tokenAddress = '0x1234567890abcdef'; // 要交换的令牌地址
const tokenAmount = web3.utils.toWei('1', 'ether'); // 要交换的令牌数量
const path = [tokenAddress, '0xUniswapRouterAddress']; // 交易路径，包括令牌地址和Uniswap路由器地址

const uniswapRouter = '0xUniswapRouterAddress'; // Uniswap路由器地址
const deadline = Math.floor(Date.now() / 1000) + 60 * 20; // 交易截止时间，当前时间加上20分钟

const txObject = {
  from: '0xYourAddress', // 发送交易的以太坊地址
  to: uniswapRouter,
  value: '0', // 交易的以太币数量
  gas: 200000, // 交易的燃气限制
  data: web3.eth.abi.encodeFunctionCall({
    name: 'swapExactTokensForTokens',
    type: 'function',
    inputs: [
      { type: 'uint256', name: 'amountIn' },
      { type: 'uint256', name: 'amountOutMin' },
      { type: 'address[]', name: 'path' },
      { type: 'address', name: 'to' },
      { type: 'uint256', name: 'deadline' },
    ],
  }, [tokenAmount, 0, path, '0xYourAddress', deadline]),
};

web3.eth.accounts.signTransaction(txObject, '0xYourPrivateKey')
  .then((signedTx) => {
    web3.eth.sendSignedTransaction(signedTx.rawTransaction)
      .on('receipt', (receipt) => {
        console.log('交易成功:', receipt);
      })
      .on('error', (error) => {
        console.error('交易失败:', error);
      });
  });