web3js实现通过合约方法进行代币交易查询余额

代币交易查询余额"/>

web3js实现通过合约方法进行代币交易查询余额

web3js

这里使用MetaMask注入的etherum

import MetaMaskSDK from '@metamask/sdk';
import Web3 from 'web3';let option = {injectProvider: false,communicationLayerPreference: 'webrtc',preferDesktop: true
}
const MMSDK = new MetaMaskSDK(option);
const ethereum = MMSDK.getProvider();
let web3 = new Web3(ethereum);

获取合同

getContract(abi, address) {if (!web3) return false;let contract = new web3.eth.Contract(abi, address);return contract}

交易

通过合同实现交易，具体参数根据合约需要，数量一般为16进制

async sendTransactionByContract(param) {const myContract = this.getContract(param.abi, param.address);if (!myContract) return;return new Promise((resolve, reject) => {myContract.methods[param.funcName](param.amount ? this.toHex(param.amount) : null).send({from: param.from}).then(res => {resolve(res)}).catch(err => {reject(err);showToast(err)})})}

获取余额等

通过合同查询余额等

async queryTransactionByContract(param) {const myContract = this.getContract(param.abi, param.address);if (!myContract) return;let ret = await myContract.methods[param.funcName](param.from).call()return ret;
}