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Tips and best practices for writing smart contracts and decentralized applications using Vue.js and JavaScript
Introduction:
Smart contracts and decentralized applications (DApps) are blockchain technology An important part of. Vue.js is a popular JavaScript framework that provides reusable and component-based development. This article will introduce tips and best practices for writing smart contracts and decentralized applications using Vue.js and JavaScript, and provide relevant code examples.
1. Smart contract development skills:
import Web3 from 'web3'; const web3 = new Web3('https://ropsten.infura.io/v3/YOUR_INFURA_PROJECT_ID'); const contractAddress = '0x1234567890abcdef1234567890abcdef12345678'; const contractABI = [{"constant": true,"inputs": [],"name": "getData","outputs": [{"name": "","type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": false,"inputs": [{"name": "_data","type": "uint256"}],"name": "setData","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}]; const contractInstance = new web3.eth.Contract(contractABI, contractAddress); // 调用智能合约中的方法 contractInstance.methods.getData().call() .then(result => { console.log("Data:", result); }) .catch(error => { console.error(error); });
npm install -g truffle
mkdir my-project cd my-project truffle init
MainContract.sol
): pragma solidity ^0.8.0; contract MainContract { uint256 public data; function setData(uint256 _data) public { data = _data; } function getData() public view returns (uint256) { return data; } }
truffle compile truffle migrate --network YOUR_NETWORK
const MainContract = artifacts.require('MainContract'); contract('MainContract', (accounts) => { let mainContractInstance; before(async () => { mainContractInstance = await MainContract.deployed(); }); it('should set and get data correctly', async () => { const testData = 100; await mainContractInstance.setData(testData); const result = await mainContractInstance.getData(); assert.equal(result, testData, 'Data is not set correctly'); }); });
2. DApp development skills:
<template> <div> <label>Data:</label> <span>{{ data }}</span> <br> <input type="number" v-model="newData"> <button @click="setData">Set Data</button> </div> </template> <script> import Web3 from 'web3'; export default { data() { return { data: 0, newData: 0, contractInstance: null }; }, mounted() { const web3 = new Web3('https://ropsten.infura.io/v3/YOUR_INFURA_PROJECT_ID'); const contractAddress = '0x1234567890abcdef1234567890abcdef12345678'; const contractABI = [{"constant": true,"inputs": [],"name": "getData","outputs": [{"name": "","type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": false,"inputs": [{"name": "_data","type": "uint256"}],"name": "setData","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}]; this.contractInstance = new web3.eth.Contract(contractABI, contractAddress); this.getData(); }, methods: { getData() { this.contractInstance.methods.getData().call() .then(result => { this.data = result; }) .catch(error => { console.error(error); }); }, setData() { this.contractInstance.methods.setData(this.newData).send() .then(() => { this.getData(); }) .catch(error => { console.error(error); }); } } }; </script>
import Web3 from 'web3'; export default { data() { return { web3: null, accounts: [], contractInstance: null }; }, mounted() { this.initWeb3(); }, methods: { async initWeb3() { // 检查是否已经安装Metamask if (typeof window.ethereum !== 'undefined') { this.web3 = new Web3(window.ethereum); // 请求用户授权 await window.ethereum.enable(); this.getAccounts(); this.initContractInstance(); } else { console.error('Please install MetaMask'); } }, async getAccounts() { this.accounts = await this.web3.eth.getAccounts(); }, initContractInstance() { const contractAddress = '0x1234567890abcdef1234567890abcdef12345678'; const contractABI = [{"constant": true,"inputs": [],"name": "getData","outputs": [{"name": "","type": "uint256"}],"payable": false,"stateMutability": "view","type": "function"},{"constant": false,"inputs": [{"name": "_data","type": "uint256"}],"name": "setData","outputs": [],"payable": false,"stateMutability": "nonpayable","type": "function"}]; this.contractInstance = new this.web3.eth.Contract(contractABI, contractAddress); }, async setData(newData) { const gasPrice = await this.web3.eth.getGasPrice(); const gasLimit = 300000; await this.contractInstance.methods.setData(newData).send({ from: this.accounts[0], gas: gasLimit, gasPrice: gasPrice }); this.getData(); } } };
Summary:
This article introduces tips and tricks for writing smart contracts and decentralized applications using Vue.js and JavaScript. Best Practices. It is easier to develop and Deploy smart contracts and decentralized applications.
(The code examples are for reference only, please modify and adjust appropriately according to actual needs.)
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