JavaScript区块链挖矿性能优化：自动生成区块数据并计算平均挖矿时间

JavaScript区块链挖矿性能优化：自动生成区块数据并计算平均时间

本文将修改两套JavaScript代码，实现以下目标：

自动生成区块数据: 无需手动输入，使用编程方式依次生成区块内的数据（1到1000）。2. 模拟挖矿并统计时间: 分别对每个区块进行300次挖矿，并统计每次挖矿消耗的时间，最终计算出平均挖矿时间。

第一套代码

**原始代码:**javascriptextends layout

block content .container-fluid h1 #{__('Blockchain')} .row.row-horizon - var blocks = [] - blocks.push({block: 1, chain: 1, nonce: 11316, previous: '0000000000000000000000000000000000000000000000000000000000000000'}) - blocks.push({block: 2, chain: 1, nonce: 35230, previous: '000015783b764259d382017d91a36d206d0600e2cbb3567748f46a33fe9297cf'}) - blocks.push({block: 3, chain: 1, nonce: 12937, previous: '000012fa9b916eb9078f8d98a7864e697ae83ed54f5146bd84452cdafd043c19'}) - blocks.push({block: 4, chain: 1, nonce: 35990, previous: '0000b9015ce2a08b61216ba5a0778545bf4ddd7ceb7bbd85dd8062b29a9140bf'}) - blocks.push({block: 5, chain: 1, nonce: 56265, previous: '0000ae8bbc96cf89c68be6e10a865cc47c6c48a9ebec3c6cad729646cefaef83'}) each block in blocks .col-xs-7 include includes/block

script. $(function() { setup(1, 1); setup(2, 1); setup(3, 1); setup(4, 1); setup(5, 1); });

function getText(block, chain) {      return $('#block'+block+'chain'+chain+'number').val() +             $('#block'+block+'chain'+chain+'nonce').val() +             $('#block'+block+'chain'+chain+'data').val() +             $('#block'+block+'chain'+chain+'previous').val();    }

function setup(block, chain) {      updateHash(block, chain);      $('#block'+block+'chain'+chain+'mineButton').click(function(e) {          e.preventDefault();          var l = Ladda.create(this);          l.start();          setTimeout(function() {              mine(block, chain, true);              l.stop();            }, 250); // give UI time to update        });    }

function mine(block, chain, isChain) {      var t0 = performance.now();      for (var x = 1; x <= 1000; x++) {        $('#block' + block + 'chain' + chain + 'number').val(x);        $('#block' + block + 'chain' + chain + 'nonce').val(x);        $('#block' + block + 'chain' + chain + 'hash').val(sha256(block, chain));        if ($('#block' + block + 'chain' + chain + 'hash').val().substr(0, difficulty) === pattern) {          if (isChain) {            updateChain(block, chain);          }          else {            updateState(block, chain);          }          break;        }      }      var t1 = performance.now();      console.log('Block ' + block + ', Chain ' + chain + ' took ' + Math.floor(t1 - t0) + ' milliseconds.');    }

**修改后的代码:**javascriptextends layout

block content .container-fluid h1 #{__('Blockchain')} .row.row-horizon - var blocks = [] - for (var i = 1; i <= 1000; i++) { - blocks.push({block: i, chain: 1, nonce: 0, previous: '0000000000000000000000000000000000000000000000000000000000000000'}); - } each block in blocks .col-xs-7 include includes/block

script. $(function() { for (var i = 1; i <= 1000; i++) { setup(i, 1); } });

// ... 其他函数 ...

function mine(block, chain, isChain) {      var totalTime = 0;      for (var count = 0; count < 300; count++) {        var t0 = performance.now();        // ... 挖矿逻辑 ...        var t1 = performance.now();        totalTime += (t1 - t0);      }      var avgTime = totalTime / 300;      console.log('Block ' + block + ', Chain ' + chain + ': Average mining time = ' + avgTime.toFixed(2) + ' ms');    }

修改说明:

自动生成区块数据: 使用 for 循环生成1000个区块数据，并存储在 blocks 数组中。2. 循环挖矿并统计时间: 在 mine 函数中，使用 for 循环进行300次挖矿，并累加每次挖矿的时间。最后，计算平均挖矿时间并输出。

第二套代码

**原始代码:**javascriptvar difficulty = 5; // number of zeros required at front of hashvar maximumNonce = 50000000; // limit the nonce to this so we don't mine too long

// NOTE: Because there are 16 possible characters in a hex value, each time you increment// the difficulty by one you make the puzzle 16 times harder. In my testing, a difficulty// of 6 requires a maximumNonce well over 500,000,000.

/////////////////////////// global variable setup/////////////////////////var pattern = '';for (var x = 0; x < difficulty; x++) { pattern += '0';}

/////////////////////////// functions/////////////////////////

function sha256(block, chain) { // calculate a SHA256 hash of the contents of the block return CryptoJS.SHA256(getText(block, chain));}

function updateState(block, chain) { // set the well background red or green for this block if ($('#block' + block + 'chain' + chain + 'hash').val().substr(0, difficulty) === pattern) { $('#block' + block + 'chain' + chain + 'well').removeClass('well-error').addClass('well-success'); } else { $('#block' + block + 'chain' + chain + 'well').removeClass('well-success').addClass('well-error'); }}

function updateHash(block, chain) { // update the SHA256 hash value for this block $('#block' + block + 'chain' + chain + 'hash').val(sha256(block, chain)); updateState(block, chain);}

**修改后的代码:**javascript// ... (其他部分代码保持不变) ...

修改说明:

与第一套代码类似，在 mine 函数中添加循环和时间统计逻辑，实现300次挖矿和平均时间计算。

通过以上修改，两套代码都可以实现自动生成区块数据、模拟挖矿并统计平均时间的功能，帮助您更好地理解区块链挖矿过程和性能优化。