安装
npm install web3
web3.js查询以太币及代币余额以及进行以太币和代币转账
在私链和主链上查询以太币及代币余额
查询类方法在私链和主链上的方法都是一样的
主链地址。可以去
infura申请
contractAbi。合约的abi。可以去https://etherscan.io获取，如果代币合约提供了code，就会有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"));
}
// 定义合约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"}];
// 合约地址
var contractAddress = "0x7FCCF800568747b178c6cBbe4Bf3d147df75ac61";
// 账号
var currentAccount = "0x4e9d5c58d8d6f02FFe5A6EF10CB804FfFB556bBb";
// 定义合约
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
});
// 查询以太币余额
web3.eth.getBalance(currentAccount).then(console.log);
// 查看某个账号的代币余额
myContract.methods.balanceOf(contractAddress).call({from: currentAccount}, function(error, result){
if(!error) {
console.log(result);
} else {
console.log(error);
}
});这里还可以查询代币的名称，符号，小数位，发行总量等等，因为代币合约一般都符合
ERC标准，都有这些基本方法。甚至如果你有合约代码和abi，还可以调用合约的其他方法，当然调用有些方法需要权限及前置条件
// 获得代币名称
myContract.methods.name().call({from: currentAccount}, function(error, result){
if(!error) {
console.log(result);
} else {
console.log(error);
}
});
// 获取代币符号
myContract.methods.symbol().call({from: currentAccount}, function(error, result){
if(!error) {
console.log(result);
} else {
console.log(error);
}
});
// 获取代币总量
myContract.methods.totalSupply().call({from: currentAccount}, function(error, result){
if(!error) {
console.log(result);
} else {
console.log(error);
}
});
// 查看某个账号允许另一个账号可使用的代币数量
myContract.methods.allowance(sender, spender).call({from: currentAccount}, function(error, result){
if(!error) {
console.log(result);
} else {
console.log(error);
}
});在私链上转账以太币及代币
// 以太币转账
web3.eth.sendTransaction({
from: currentAccount,
to: receiverAccount,
value: '1000000000000000'
})
.then(function(receipt){
console.log(receipt);
});
// 代币转账
myContract.methods.transfer(to, amount).send({from: currentAccount}), function(error, transactionHash){
if(!error) {
console.log('transactionHash is ' + transactionHash);
} else {
console.log(error);
}
});在主链上转账以太币及代币
上面的方法只适用于私链。因为你在私链的账户在本地是有私钥的。而在主链上要进行写入数据的方法，是需要获取账户的私钥并对交易进行签名的，所以要用到
web3.eth.sendSignedTransaction方法-文档
npm install ethereumjs-tx
以太币转账
// 引入ethereumjs-tx
var Tx = require('ethereumjs-tx');
// 以太币转账
// 先获取当前账号交易的nonce
web3.eth.getTransactionCount(currentAccount, web3.eth.defaultBlock.pending).then(function(nonce){
// 获取交易数据
var txData = {
// nonce每次++，以免覆盖之前pending中的交易
nonce: web3.utils.toHex(nonce++),
// 设置gasLimit和gasPrice
gasLimit: web3.utils.toHex(99000),
gasPrice: web3.utils.toHex(10e9),
// 要转账的哪个账号
to: '0x3b11f5CAB8362807273e1680890A802c5F1B15a8',
// 从哪个账号转
from: currentAccount,
// 0.001 以太币
value: web3.utils.toHex(10e14),
data: ''
}
var tx = new Tx(txData);
// 引入私钥，并转换为16进制
const privateKey = new Buffer('your account privateKey', 'hex');
// 用私钥签署交易
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);
}
});
});代币转账
// 补齐64位，不够前面用0补齐
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){
// 获取交易数据
var txData = {
nonce: web3.utils.toHex(nonce++),
gasLimit: web3.utils.toHex(99000),
gasPrice: web3.utils.toHex(10e9),
// 注意这里是代币合约地址
to: contractAddress,
from: currentAccount,
// 调用合约转账value这里留空
value: '0x00',
// data的组成，由：0x + 要调用的合约方法的function signature + 要传递的方法参数，每个参数都为64位(对transfer来说，第一个是接收人的地址去掉0x，第二个是代币数量的16进制表示，去掉前面0x，然后补齐为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);
}
});
});到此这篇关于Web3.js查询以太币和代币余额以及转账的文章就介绍到这了,更多相关Web3.js 转账余额查询内容请搜索阿兔在线工具以前的文章或继续浏览下面的相关文章希望大家以后多多支持阿兔在线工具！
