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比價

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Jul 10th, 2024
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  1. <!DOCTYPE html>
  2. <html lang="zh-TW">
  3. <head>
  4. <meta charset="UTF-8">
  5. <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6. <title>比價網頁</title>
  7. <style>
  8.   body {
  9.     text-align: center;
  10.     font-family: Arial, sans-serif;
  11.     padding: 20px;
  12.   }
  13.   table {
  14.     border-collapse: collapse;
  15.     width: 100%;
  16.     max-width: 800px;
  17.     margin: 20px auto 0;
  18.   }
  19.   table, th, td {
  20.     border: 1px solid black;
  21.     text-align: center;
  22.     padding: 8px;
  23.   }
  24.   th {
  25.     background-color: #f2f2f2;
  26.   }
  27.   .lowest-price {
  28.     font-weight: bold;
  29.     color: red;
  30.   }
  31.   th, td {
  32.     width: 33.33%;
  33.   }
  34.   .total-price, .quantity {
  35.     width: 100%;
  36.     box-sizing: border-box;
  37.     padding: 10px;
  38.     margin: 0;
  39.     font-size: 16px;
  40.   }
  41.   .unit-price {
  42.     font-size: 16px;
  43.   }
  44.   input[type="number"] {
  45.     -moz-appearance: textfield;
  46.   }
  47.   input::-webkit-outer-spin-button,
  48.   input::-webkit-inner-spin-button {
  49.     -webkit-appearance: none;
  50.     margin: 0;
  51.   }
  52.   #reset-button {
  53.     margin-top: 20px;
  54.     padding: 10px 20px;
  55.     font-size: 16px;
  56.     background-color: #f2f2f2;
  57.     border: 1px solid #ccc;
  58.     cursor: pointer;
  59.   }
  60.   #reset-button:hover {
  61.     background-color: #e6e6e6;
  62.   }
  63.   @media screen and (max-width: 600px) {
  64.     table {
  65.       font-size: 14px;
  66.     }
  67.     .total-price, .quantity, .unit-price {
  68.       font-size: 14px;
  69.     }
  70.     .total-price, .quantity {
  71.       padding: 8px;
  72.     }
  73.     #reset-button {
  74.       font-size: 14px;
  75.       padding: 8px 16px;
  76.     }
  77.   }
  78. </style>
  79. </head>
  80. <body>
  81. <h2>商品比價表</h2>
  82. <table id="price-table">
  83.   <tr>
  84.     <th>售價</th>
  85.     <th>容量 or 重量</th>
  86.     <th>每單位價格</th>
  87.   </tr>
  88.   <tr>
  89.     <td><input type="number" class="total-price" oninput="calculateUnitPrice(0)" /></td>
  90.     <td><input type="number" class="quantity" oninput="calculateUnitPrice(0)" /></td>
  91.     <td class="unit-price"></td>
  92.   </tr>
  93.   <tr>
  94.     <td><input type="number" class="total-price" oninput="calculateUnitPrice(1)" /></td>
  95.     <td><input type="number" class="quantity" oninput="calculateUnitPrice(1)" /></td>
  96.     <td class="unit-price"></td>
  97.   </tr>
  98.   <tr>
  99.     <td><input type="number" class="total-price" oninput="calculateUnitPrice(2)" /></td>
  100.     <td><input type="number" class="quantity" oninput="calculateUnitPrice(2)" /></td>
  101.     <td class="unit-price"></td>
  102.   </tr>
  103.   <tr>
  104.     <td><input type="number" class="total-price" oninput="calculateUnitPrice(3)" /></td>
  105.     <td><input type="number" class="quantity" oninput="calculateUnitPrice(3)" /></td>
  106.     <td class="unit-price"></td>
  107.   </tr>
  108.   <tr>
  109.     <td><input type="number" class="total-price" oninput="calculateUnitPrice(4)" /></td>
  110.     <td><input type="number" class="quantity" oninput="calculateUnitPrice(4)" /></td>
  111.     <td class="unit-price"></td>
  112.   </tr>
  113. </table>
  114. <button id="reset-button">再來一次</button>
  115. <script>
  116. function calculateUnitPrice(row) {
  117.   var totalPrice = parseFloat(document.getElementsByClassName('total-price')[row].value);
  118.   var quantity = parseFloat(document.getElementsByClassName('quantity')[row].value);
  119.  
  120.   if (isNaN(totalPrice) || isNaN(quantity) || quantity <= 0) {
  121.    document.getElementsByClassName('unit-price')[row].innerText = '';
  122.    return;
  123.  }
  124.  
  125.  var unitPrice = totalPrice / quantity;
  126.  document.getElementsByClassName('unit-price')[row].innerText = unitPrice.toFixed(2);
  127.  
  128.  highlightLowestPrice();
  129. }
  130.  
  131. function highlightLowestPrice() {
  132.  var unitPrices = document.getElementsByClassName('unit-price');
  133.  var lowestPrice = Infinity;
  134.  var lowestIndexes = [];
  135.  
  136.  // 找出最低價格及其索引
  137.  for (var i = 0; i < unitPrices.length; i++) {
  138.    if (unitPrices[i].innerText !== '') {
  139.      var price = parseFloat(unitPrices[i].innerText);
  140.      if (price < lowestPrice) {
  141.        lowestPrice = price;
  142.        lowestIndexes = [i];
  143.      } else if (price === lowestPrice) {
  144.        lowestIndexes.push(i);
  145.      }
  146.    }
  147.  }
  148.  
  149.  // 將最低價格的單元格標記為紅色粗體
  150.  for (var j = 0; j < unitPrices.length; j++) {
  151.    if (lowestIndexes.includes(j)) {
  152.      unitPrices[j].classList.add('lowest-price');
  153.    } else {
  154.      unitPrices[j].classList.remove('lowest-price');
  155.    }
  156.  }
  157. }
  158.  
  159. function resetTable() {
  160.  var totalPrices = document.getElementsByClassName('total-price');
  161.  var quantities = document.getElementsByClassName('quantity');
  162.  var unitPrices = document.getElementsByClassName('unit-price');
  163.  
  164.  for (var i = 0; i < totalPrices.length; i++) {
  165.    totalPrices[i].value = '';
  166.    quantities[i].value = '';
  167.    unitPrices[i].innerText = '';
  168.    unitPrices[i].classList.remove('lowest-price');
  169.  }
  170. }
  171.  
  172. document.getElementById('reset-button').addEventListener('click', resetTable);
  173. </script>
  174. </body>
  175. </html>
  176.  
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