Web3.js查詢以太幣和代幣余額及轉賬

更新時間：2022年09月20日 10:49:23 作者：JackieDYH

這篇文章主要介紹了Web3.js查詢以太幣和代幣余額以及轉賬,本文通過實例代碼給大家介紹的非常詳細，對大家的學習或工作具有一定的參考借鑒價值，需要的朋友可以參考下

安裝

npm install web3

web3.js查詢以太幣及代幣余額以及進行以太幣和代幣轉賬

在私鏈和主鏈上查詢以太幣及代幣余額

查詢類方法在私鏈和主鏈上的方法都是一樣的

主鏈地址?？梢匀?code>infura申請

contractAbi。合約的abi?？梢匀?a rel="external nofollow" target="_blank">https://etherscan.io獲取，如果代幣合約提供了code，就會有abi

// 引入web3
var Web3 = require('web3');
if (typeof web3 !== 'undefined') {
    web3 = new Web3(web3.currentProvider);
} else {
    // web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:7545"));
    web3 = new Web3(new Web3.providers.HttpProvider("https://mainnet.infura.io/yourAddress"));
}
 
// 定義合約abi
var contractAbi = [{"constant":true,"inputs":[],"name":"mintingFinished","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cap","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"mint","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_value","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_subtractedValue","type":"uint256"}],"name":"decreaseApproval","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"finishMinting","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_addedValue","type":"uint256"}],"name":"increaseApproval","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"burner","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"amount","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[],"name":"MintFinished","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"}];
 
// 合約地址
var contractAddress = "0x7FCCF800568747b178c6cBbe4Bf3d147df75ac61";
 
// 賬號
var currentAccount = "0x4e9d5c58d8d6f02FFe5A6EF10CB804FfFB556bBb";
 
// 定義合約
var myContract = new web3.eth.Contract(contractAbi, contractAddress, {
    from: currentAccount, // default from address
    gasPrice: '10000000000' // default gas price in wei, 10 gwei in this case
});
 
// 查詢以太幣余額
web3.eth.getBalance(currentAccount).then(console.log);
 
// 查看某個賬號的代幣余額
myContract.methods.balanceOf(contractAddress).call({from: currentAccount}, function(error, result){
    if(!error) {
        console.log(result);
    } else {
        console.log(error);
    }
});

這里還可以查詢代幣的名稱，符號，小數(shù)位，發(fā)行總量等等，因為代幣合約一般都符合ERC標準，都有這些基本方法。甚至如果你有合約代碼和abi，還可以調(diào)用合約的其他方法，當然調(diào)用有些方法需要權限及前置條件

// 獲得代幣名稱
myContract.methods.name().call({from: currentAccount}, function(error, result){
    if(!error) {
          console.log(result);
    } else {
      console.log(error);
    }
});
 
// 獲取代幣符號
myContract.methods.symbol().call({from: currentAccount}, function(error, result){
    if(!error) {
      console.log(result);
     } else {
      console.log(error);
     }
});
 
// 獲取代幣總量
myContract.methods.totalSupply().call({from: currentAccount}, function(error, result){
    if(!error) {
      console.log(result);
     } else {
      console.log(error);
     }
});
 
// 查看某個賬號允許另一個賬號可使用的代幣數(shù)量
myContract.methods.allowance(sender, spender).call({from: currentAccount}, function(error, result){
    if(!error) {
      console.log(result);
     } else {
      console.log(error);
     }
});

在私鏈上轉賬以太幣及代幣

// 以太幣轉賬
web3.eth.sendTransaction({
    from: currentAccount,
    to: receiverAccount,
    value: '1000000000000000'
})
.then(function(receipt){
    console.log(receipt);
});
 
// 代幣轉賬
myContract.methods.transfer(to, amount).send({from: currentAccount}), function(error, transactionHash){
    if(!error) {
       console.log('transactionHash is ' + transactionHash);
    } else {
       console.log(error);
    }
});

在主鏈上轉賬以太幣及代幣

上面的方法只適用于私鏈。因為你在私鏈的賬戶在本地是有私鑰的。而在主鏈上要進行寫入數(shù)據(jù)的方法，是需要獲取賬戶的私鑰并對交易進行簽名的，所以要用到web3.eth.sendSignedTransaction方法-文檔

npm install ethereumjs-tx

以太幣轉賬

// 引入ethereumjs-tx
var Tx = require('ethereumjs-tx');
 
// 以太幣轉賬    
// 先獲取當前賬號交易的nonce
web3.eth.getTransactionCount(currentAccount, web3.eth.defaultBlock.pending).then(function(nonce){
 
    
    // 獲取交易數(shù)據(jù)
    var txData = {
        // nonce每次++，以免覆蓋之前pending中的交易
        nonce: web3.utils.toHex(nonce++),
        // 設置gasLimit和gasPrice
        gasLimit: web3.utils.toHex(99000),   
        gasPrice: web3.utils.toHex(10e9),  
        // 要轉賬的哪個賬號  
        to: '0x3b11f5CAB8362807273e1680890A802c5F1B15a8',
        // 從哪個賬號轉
        from: currentAccount,
        // 0.001 以太幣
        value: web3.utils.toHex(10e14),         
        data: ''
    }
 
    var tx = new Tx(txData);
 
    // 引入私鑰，并轉換為16進制
    const privateKey = new Buffer('your account privateKey', 'hex'); 
 
    // 用私鑰簽署交易
    tx.sign(privateKey);
 
    // 序列化
    var serializedTx = tx.serialize().toString('hex');
 
    web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'), function(err, hash) {
        if (!err) {
            console.log(hash);
        } else {
            console.error(err);
        }
    });
});

代幣轉賬

// 補齊64位，不夠前面用0補齊
function addPreZero(num){
  var t = (num+'').length,
  s = '';
  for(var i=0; i<64-t; i++){
    s += '0';
  }
  return s+num;
}
 
web3.eth.getTransactionCount(currentAccount, web3.eth.defaultBlock.pending).then(function(nonce){
 
    // 獲取交易數(shù)據(jù)
    var txData = {
        nonce: web3.utils.toHex(nonce++),
        gasLimit: web3.utils.toHex(99000),   
        gasPrice: web3.utils.toHex(10e9),
        // 注意這里是代幣合約地址    
        to: contractAddress,
        from: currentAccount,
        // 調(diào)用合約轉賬value這里留空
        value: '0x00',         
        // data的組成，由：0x + 要調(diào)用的合約方法的function signature + 要傳遞的方法參數(shù)，每個參數(shù)都為64位(對transfer來說，第一個是接收人的地址去掉0x，第二個是代幣數(shù)量的16進制表示，去掉前面0x，然后補齊為64位)
        data: '0x' + 'a9059cbb' + addPreZero('3b11f5CAB8362807273e1680890A802c5F1B15a8') + addPreZero(web3.utils.toHex(1000000000000000000).substr(2))
    }
 
    var tx = new Tx(txData);
 
    const privateKey = new Buffer('your account privateKey', 'hex'); 
 
    tx.sign(privateKey);
 
    var serializedTx = tx.serialize().toString('hex');
 
    web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'), function(err, hash) {
        if (!err) {
            console.log(hash);
        } else {
            console.error(err);
        }
    });
});

到此這篇關于Web3.js查詢以太幣和代幣余額以及轉賬的文章就介紹到這了,更多相關Web3.js 轉賬余額查詢內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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