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A guide to developing smart contracts and blockchain applications using Vue.js and JavaScript
Introduction:
With the development of blockchain technology, Ethereum, as a smart contract platform, provides a platform for development The staff provided a great convenience. Vue.js, as a popular JavaScript framework, provides developers with powerful front-end technical support. This article will provide a guide on how to use Vue.js and JavaScript to develop smart contracts and blockchain applications, with code examples.
node -v npm -v
npm install -g @vue/cli vue create blockchain-app cd blockchain-app
The above command will install the Vue CLI globally and create a new Vue.js project in the project folder. Then switch to the project folder.
npm install web3
src/store/index.js
file and import web3 at the top of the file: import Web3 from 'web3';
Then, add a file named properties of web3
and set it to null: <pre class='brush:javascript;toolbar:false;'>state: {
web3: null
},</pre>
Next, add a method named
in mutations
, This method will be responsible for creating the web3 instance and storing it in Vuex's state
: <pre class='brush:javascript;toolbar:false;'>mutations: {
registerWeb3(state, payload) {
state.web3 = payload.web3;
}
},</pre>
Finally, add a file called
actions ## method, which will be responsible for connecting to the Ethereum blockchain and calling the
registerWeb3 method:
actions: { initWeb3({ commit }) { if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); commit('registerWeb3', { web3 }); } else { console.error('No web3 provider detected'); } } },
Smart Contract Interaction Next, we will The component calls the methods of the smart contract and interacts with the Ethereum blockchain. Create a property named life cycle hook:
<pre class='brush:javascript;toolbar:false;'>import contractABI from '@/contracts/ContractABI.json';
import contractAddress from '@/contracts/ContractAddress.json';
export default {
data() {
return {
contract: null
};
},
created() {
this.contract = new web3.eth.Contract(contractABI, contractAddress);
},
methods: {
async getContractData() {
const result = await this.contract.methods.getData().call();
console.log(result);
},
async setContractData() {
await this.contract.methods.setData('Hello, blockchain!').send({ from: web3.eth.defaultAccount });
console.log('Transaction completed');
}
}
}</pre>
In the above code , we first import the ABI (Application Binary Interface) and address of the smart contract. Then, in the In the
methods
getContractData and
setContractData, which are used to call the smart contract methods and Interact with the Ethereum blockchain.
Code Example
<pre class='brush:html;toolbar:false;'><template>
<div>
<button @click="getContractData">Get Data</button>
<button @click="setContractData">Set Data</button>
</div>
</template></pre>
The above code adds two buttons to the template of the Vue component and calls setContractData methods.
Summary:
This article introduces a guide to developing smart contracts and blockchain applications using Vue.js and JavaScript. We first prepared the development environment and created a new Vue.js project. Then, connect to the Ethereum blockchain through the web3.js library, and call the smart contract's methods in the Vue component and interact with the blockchain. Through this guide, developers already have the basic knowledge and skills to develop smart contracts and blockchain applications using Vue.js and JavaScript.
Appendix: Complete code example
// src/store/index.js import Web3 from 'web3'; export default { state: { web3: null }, mutations: { registerWeb3(state, payload) { state.web3 = payload.web3; } }, actions: { initWeb3({ commit }) { if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); commit('registerWeb3', { web3 }); } else { console.error('No web3 provider detected'); } } } }
// src/views/Home.vue import contractABI from '@/contracts/ContractABI.json'; import contractAddress from '@/contracts/ContractAddress.json'; export default { data() { return { contract: null }; }, created() { this.contract = new web3.eth.Contract(contractABI, contractAddress); }, methods: { async getContractData() { const result = await this.contract.methods.getData().call(); console.log(result); }, async setContractData() { await this.contract.methods.setData('Hello, blockchain!').send({ from: web3.eth.defaultAccount }); console.log('Transaction completed'); } } }I hope this article will be helpful to beginners who use Vue.js and JavaScript to develop smart contracts and blockchain applications. Further learning and development can be carried out according to actual needs.
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