用js写的一个简单区块链代码,实现了数据上链,数据检验,是否被篡改等功能,代码如下:
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>BFW DEMO JS PAGE</title>
<script id="bfwone" data="dep=jquery.17|crypto-js-3.1.9-1/crypto-js" src="//repo.bfw.wiki/bfwrepo/js/bfwone.js"></script>
<script>
class Block {
constructor(index, timestamp, data, previousHash = '') {
this.index = index;
this.previousHash = previousHash;
this.timestamp = timestamp;
this.data = data;
this.hash = this.calculateHash();
}
calculateHash() {
return CryptoJS.SHA256(this.index + this.previousHash + this.timestamp + JSON.stringify(this.data)).toString();
}
}
class Blockchain {
constructor() {
this.chain = [this.createGenesisBlock()];
}
createGenesisBlock() {
return new Block(0, "011/01/2019", "bfw init block", "0");
}
getLatestBlock() {
return this.chain[this.chain.length - 1];
}
addBlock(newBlock) {
newBlock.previousHash = this.getLatestBlock().hash;
newBlock.hash = newBlock.calculateHash();
this.chain.push(newBlock);
}
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;
}
}
bready(function() {
let bfwcoin = new Blockchain();
bfwcoin.addBlock(new Block(1, "1/12/2019", {
amount: 4
}));
bfwcoin.addBlock(new Block(2, "2/12/2019", {
amount: 8
}));
console.log(bfwcoin);
// 检查是否有效(将会返回true)
console.log('区块链是否有效? ' + bfwcoin.isChainValid());
// 现在尝试操作变更数据
bfwcoin.chain[1].data = {
amount: 100
};
console.log(bfwcoin);
// 再次检查是否有效 (将会返回false)
console.log("区块链是否有效? " + bfwcoin.isChainValid());
});
</script>
</head>
<body>
</body>
</html>
网友回复
python如何调用openai的api实现知识讲解类动画讲解视频的合成?
html如何直接调用openai的api实现海报可视化设计及文本描述生成可编辑海报?
f12前端调试如何找出按钮点击事件触发的那段代码进行调试?
abcjs如何将曲谱播放后导出mid和wav格式音频下载?
python如何将曲子文本生成音乐mp3或wav、mid文件
python中mp3、wav音乐如何转成mid格式?
js在HTML中如何将曲谱生成音乐在线播放并下载本地?
python如何实现在windows上通过键盘来模拟鼠标操作?
python如何给win10电脑增加文件或文件夹右键自定义菜单?
python如何将音乐mp3文件解析获取曲调数据?