js 实现简单区块链

一步步解决问题，简单写个链，

const SHA256 = require("crypto-js/sha256");class Block {constructor(index, transactions, timestamp, previousHash) {this.index = index;this.transactions = transactions;this.timestamp = timestamp;this.previousHash = previousHash;this.hash = this.calculateHash();this.nonce = 0; //工作量证明}calculateHash() {return SHA256(this.index +this.previousHash +this.timestamp +JSON.stringify(this.transactions) +this.nonce).toString();}mineBlock(difficulty) {while (this.hash.substring(0, difficulty) !== Array(difficulty + 1).join("0")) {this.nonce++;this.hash = this.calculateHash();}}
}class Blockchain {constructor() {this.index = 0;this.difficulty = 2;this.pendingTransactions = [];this.miningReward = 200;this.chain = [this.createGenesisBlock()];}createGenesisBlock() {let firstBlock = new Block(this.index++, "创世love", new Date(), "我爱你");firstBlock.mineBlock(this.difficulty);return firstBlock;}getLatestBlock() {return this.chain[this.chain.length - 1];}createTransaction(transactions) {// 这里应该有一些校验!// 推入待处理交易数组this.pendingTransactions.push(transactions);}isChainValid() {for (let i = 1; i < this.chain.length; i++) {const currentBlock = this.chain[i];const previousBlock = this.chain[i - 1];if (currentBlock.hash !== currentBlock.calculateHash()) {return false;}if (currentBlock.previousHash !== previousBlock.hash) {return false;}}return true;}minePendingTransactions(miningRewardAddress) {// 用所有待交易来创建新的区块并且开挖..let block = new Block(this.index++,this.pendingTransactions,new Date(),this.getLatestBlock().hash);block.mineBlock(this.difficulty);// 将新挖的看矿加入到链上this.chain.push(block);// 重置待处理交易列表并且发送奖励this.pendingTransactions = [new Transaction(null, miningRewardAddress, this.miningReward),];}getBalanceOfAddress(address) {let balance = 0; // you start at zero!// 遍历每个区块以及每个区块内的交易for (const block of this.chain) {for (const trans of block.transactions) {// 如果地址是发起方 -> 减少余额if (trans.fromAddress === address) {balance -= trans.amount;}// 如果地址是接收方 -> 增加余额if (trans.toAddress === address) {balance += trans.amount;}}}return balance;}
}// 交易信息
class Transaction {constructor(fromAddress, toAddress, amount) {this.fromAddress = fromAddress;this.toAddress = toAddress;this.amount = amount;}
}let chain1 = new Blockchain();chain1.createTransaction(new Transaction("anni", "zhanguo", 50));
chain1.createTransaction(new Transaction("anni", "zhanguo", 60));
chain1.createTransaction(new Transaction("anni", "zhanguo", 100));chain1.minePendingTransactions("anni");chain1.createTransaction(new Transaction("anni", "zhanguo", 50));
chain1.createTransaction(new Transaction("anni", "zhanguo", 60));
chain1.createTransaction(new Transaction("anni", "zhanguo", 100));chain1.minePendingTransactions("anni");chain1.minePendingTransactions("anni");console.log(chain1.chain,chain1.getBalanceOfAddress("anni"),chain1.getBalanceOfAddress("zhanguo")
);

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js 实现简单区块链

一步步解决问题，简单写个链，

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