<!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="http://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
}));
// 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>
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