Tips and best practices for writing smart contracts and decentralized applications using Vue.js and JavaScript

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:

1. Use Web3.js to interact with smart contracts
   Web3.js is a method used to interact with the Ethereum network JavaScript library. It provides a set of methods to connect to smart contracts and use the methods defined in the contract. The following is a code example for interacting with a smart contract using Web3.js:

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);
  });

2. Using the Truffle framework for smart contract development and deployment
   Truffle is a framework for smart contract development and deployment Development Framework. It provides a set of tools that make contract compilation, testing, and deployment easy. The following are the steps for smart contract development using the Truffle framework:

• Install the Truffle framework:

npm install -g truffle

• Create a new Truffle project:

mkdir my-project
cd my-project
truffle init

• Write a smart contract (for example, the file name is 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;
    }
}

• Compile and deploy the smart contract:

truffle compile
truffle migrate --network YOUR_NETWORK

3. Use the testing framework for smart contract testing
   Testing smart contracts is a very important way to ensure the normal functionality of the contract in different scenarios. The Truffle framework provides a set of testing tools to simplify the testing process of smart contracts. The following is a code example for smart contract testing using the Truffle framework:

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:

1. Use Vue.js to develop user interfaces
   Vue. js is a JavaScript framework for building user interfaces, which provides a composable and reusable development method. Using Vue.js you can easily build a DApp’s user interface and interact with smart contracts. The following is a code example for developing a DApp using Vue.js:

<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>

2. Using Metamask for user authentication and transaction signing
   Metamask is a popular Ethereum wallet plugin that provides Provides user identity verification and transaction signature functions. Metamask can be integrated with DApps to ensure that only users with the correct permissions can perform contract interactions. The following is a code example of using Metamask for user authentication and transaction signing:

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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