区块链js开发区块链开发框架

皕利分享 2023年01月18日 20:35 130 0

今天给各位分享区块链js开发的知识，其中也会对区块链开发框架进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

怎样开发区块链怎么做区块链开发

Go 是一个开源的编程语言，它能让构造简单、可靠且高效的软件变得容易。想学习这门编程语言，首先要找到一份不错的教程，兄弟连go语言+区块链培训最近新出了一套go语言的教程，老师讲的非常不错！

伴随着“区块链”概念在全球范围内的热议，金融、物流、征信、制造、零售等日常生活场景中也悄然加入了相关区块链技术应用。有专家表明，未来区块链将与人们的生活息息相关，区块链技术与大众日常生活融合是大势所趋。

区块链市场的火热引发了大量以区块链技术型人员为基础的人才性需求，区块链人才受热捧程度呈光速上升。据拉勾网发布的“2018年区块链高薪清单”显示，腾讯、小米、苏宁、京东等国内企业巨头发布了众多高薪区块链岗需求，力图探索区块链相关技术与应用。清单中同时指出，高薪岗位以区块链相关技术型岗位需求为主，其中苏宁和科达月薪最高已给到100k。

极大的技术型人才市场需求，必然会带动整个区块链培训市场的爆发式涌现与增长。培训模式大都可分为线上培训、传统IT机构培训及主打高端形式的线下短期训练营等几种形式，但市场火爆演进过程中也充斥着种种区块链培训乱象：讲师资质注水化、甚至是最基本的姓名都不敢公开，课程大纲不透明、授课质量缩水化，课时安排不合理及培训收费标准参差不齐等等。

在整个区块链培训市场规模化发展之下，兄弟连教育携手资深区块链专家尹成及其清华水木未名团队成立区块链学院，利用其专业强大的技术讲师团队、细致全面的课程体系及海量真实性企业区块链项目实战，旨在深耕区块链教培领域，并为企业为社会培养更多专业型技术人才。

尹成资深区块链技术专家兄弟连区块链学院院长毕业于清华大学，曾担任Google算法工程师，微软区块链领域全球最具价值专家，微软Tech.Ed 大会金牌讲师。精通C/C++、Python、Go语言、Sicikit-Learn与TensorFlow。拥有15年编程经验与5年的教学经验，资深软件架构师，Intel软件技术专家，著名技术专家，具备多年的世界顶尖IT公司微软谷歌的工作经验。具备多年的软件编程经验与讲师授课经历，并在人机交互、教育、信息安全、广告、区块链系统开发诸多产品。具备深厚的项目管理经验以及研发经验，拥有两项人工智能发明专利，与开发电子货币部署到微软Windows Azure的实战经验。教学讲解深入浅出，使学员能够做到学以致用。

第一阶段：区块链行业及Go编程 5周

第二阶段：密码学与共识算法 2周

第三阶段：以太坊源码解析与开发 3周

第四阶段：超级账本与Node.js 2周

第五阶段：比特币 EOS 4周

第六阶段：项目综合性实战

如何用JavaScript实现区块链

span style="font-family:Arial, Helvetica, sans-serif;"'use strict';/spanvar CryptoJS = require("crypto-js");var express = require("express");var bodyParser = require('body-parser');var WebSocket = require("ws");var http_port = process.env.HTTP_PORT || 3001;var p2p_port = process.env.P2P_PORT || 6001;var initialPeers = process.env.PEERS ? process.env.PEERS.split(',') : [];class Block { constructor(index, previousHash, timestamp, data, hash) { this.index = index; this.previousHash = previousHash.toString(); this.timestamp = timestamp; this.data = data; this.hash = hash.toString(); }}var sockets = [];var MessageType = { QUERY_LATEST: 0, QUERY_ALL: 1, RESPONSE_BLOCKCHAIN: 2};var getGenesisBlock = () = { return new Block(0, "0", 1465154705, "my genesis block!!", "816534932c2b7154836da6afc367695e6337db8a921823784c14378abed4f7d7");};var blockchain = [getGenesisBlock()];var initHttpServer = () = { var app = express(); app.use(bodyParser.json()); app.get('/blocks', (req, res) = res.send(JSON.stringify(blockchain))); app.post('/mineBlock', (req, res) = { var newBlock = generateNextBlock(req.body.data); addBlock(newBlock); broadcast(responseLatestMsg()); console.log('block added: ' + JSON.stringify(newBlock)); res.send(); }); app.get('/peers', (req, res) = { res.send(sockets.map(s = s._socket.remoteAddress + ':' + s._socket.remotePort)); }); app.post('/addPeer', (req, res) = { connectToPeers([req.body.peer]); res.send(); }); app.listen(http_port, () = console.log('Listening http on port: ' + http_port));};var initP2PServer = () = { var server = new WebSocket.Server({port: p2p_port}); server.on('connection', ws = initConnection(ws)); console.log('listening websocket p2p port on: ' + p2p_port);};var initConnection = (ws) = { sockets.push(ws); initMessageHandler(ws); initErrorHandler(ws); write(ws, queryChainLengthMsg());};var initMessageHandler = (ws) = { ws.on('message', (data) = { var message = JSON.parse(data); console.log('Received message' + JSON.stringify(message)); switch (message.type) { case MessageType.QUERY_LATEST: write(ws, responseLatestMsg()); break; case MessageType.QUERY_ALL: write(ws, responseChainMsg()); break; case MessageType.RESPONSE_BLOCKCHAIN: handleBlockchainResponse(message); break; } });};var initErrorHandler = (ws) = { var closeConnection = (ws) = { console.log('connection failed to peer: ' + ws.url); sockets.splice(sockets.indexOf(ws), 1); }; ws.on('close', () = closeConnection(ws)); ws.on('error', () = closeConnection(ws));};var generateNextBlock = (blockData) = { var previousBlock = getLatestBlock(); var nextIndex = previousBlock.index + 1; var nextTimestamp = new Date().getTime() / 1000; var nextHash = calculateHash(nextIndex, previousBlock.hash, nextTimestamp, blockData); return new Block(nextIndex, previousBlock.hash, nextTimestamp, blockData, nextHash);};var calculateHashForBlock = (block) = { return calculateHash(block.index, block.previousHash, block.timestamp, block.data);};var calculateHash = (index, previousHash, timestamp, data) = { return CryptoJS.SHA256(index + previousHash + timestamp + data).toString();};var addBlock = (newBlock) = { if (isValidNewBlock(newBlock, getLatestBlock())) { blockchain.push(newBlock); }};var isValidNewBlock = (newBlock, previousBlock) = { if (previousBlock.index + 1 !== newBlock.index) { console.log('invalid index'); return false; } else if (previousBlock.hash !== newBlock.previousHash) { console.log('invalid previoushash'); return false; } else if (calculateHashForBlock(newBlock) !== newBlock.hash) { console.log(typeof (newBlock.hash) + ' ' + typeof calculateHashForBlock(newBlock)); console.log('invalid hash: ' + calculateHashForBlock(newBlock) + ' ' + newBlock.hash); return false; } return true;};var connectToPeers = (newPeers) = { newPeers.forEach((peer) = { var ws = new WebSocket(peer); ws.on('open', () = initConnection(ws)); ws.on('error', () = { console.log('connection failed') }); });};var handleBlockchainResponse = (message) = { var receivedBlocks = JSON.parse(message.data).sort((b1, b2) = (b1.index - b2.index)); var latestBlockReceived = receivedBlocks[receivedBlocks.length - 1]; var latestBlockHeld = getLatestBlock(); if (latestBlockReceived.index latestBlockHeld.index) { console.log('blockchain possibly behind. We got: ' + latestBlockHeld.index + ' Peer got: ' + latestBlockReceived.index); if (latestBlockHeld.hash === latestBlockReceived.previousHash) { console.log("We can append the received block to our chain"); blockchain.push(latestBlockReceived); broadcast(responseLatestMsg()); } else if (receivedBlocks.length === 1) { console.log("We have to query the chain from our peer"); broadcast(queryAllMsg()); } else { console.log("Received blockchain is longer than current blockchain"); replaceChain(receivedBlocks); } } else { console.log('received blockchain is not longer than received blockchain. Do nothing'); }};var replaceChain = (newBlocks) = { if (isValidChain(newBlocks) newBlocks.length blockchain.length) { console.log('Received blockchain is valid. Replacing current blockchain with received blockchain'); blockchain = newBlocks; broadcast(responseLatestMsg()); } else { console.log('Received blockchain invalid'); }};var isValidChain = (blockchainToValidate) = { if (JSON.stringify(blockchainToValidate[0]) !== JSON.stringify(getGenesisBlock())) { return false; } var tempBlocks = [blockchainToValidate[0]]; for (var i = 1; i blockchainToValidate.length; i++) { if (isValidNewBlock(blockchainToValidate[i], tempBlocks[i - 1])) { tempBlocks.push(blockchainToValidate[i]); } else { return false; } } return true;};var getLatestBlock = () = blockchain[blockchain.length - 1];var queryChainLengthMsg = () = ({'type': MessageType.QUERY_LATEST});var queryAllMsg = () = ({'type': MessageType.QUERY_ALL});var responseChainMsg = () =({ 'type': MessageType.RESPONSE_BLOCKCHAIN, 'data': JSON.stringify(blockchain)});var responseLatestMsg = () = ({ 'type': MessageType.RESPONSE_BLOCKCHAIN, 'data': JSON.stringify([getLatestBlock()])});var write = (ws, message) = ws.send(JSON.stringify(message));var broadcast = (message) = sockets.forEach(socket = write(socket, message));connectToPeers(initialPeers);initHttpServer();initP2PServer();