如何顯示表格標題但值顯示“？”-有解無憂

我有一個輸入分數的表格，當用戶單擊“提交”按鈕時，它會顯示一個包含所有輸入資訊的表格。但是，我的問題是我想將表格標題顯示為“平均分數”，但“平均分數”列的值應該顯示為“？” .讓我介紹以下內容，我想用純 JS 完成這個練習，請幫忙。我真的很感激和感激。

這是我的 HTML 檔案：

<body>
    <script src="js/script.js"></script>
    <h1 align="center">Class Marksheet</h1>

    <table align="center">
      <tr>
        <td>Name:</td>
        <td><input name="name" id="name" type="text" /></td>
      </tr>

      <tr>
        <td>Math:</td>
        <td>
          <input name="math" min="0" max="10" id="math" type="number" />
        </td>
      </tr>

      <tr>
        <td>Physics:</td>
        <td>
          <input name="physics" min="0" max="10" id="physics" type="number" />
        </td>
      </tr>

      <tr>
        <td>Chemistry:</td>
        <td>
          <input name="chemical" min="0" max="10" id="chemical" type="number" />
        </td>
      </tr>

      <td>
        <button type="submit" onclick="score_table()">Submit</button>
      </td>
    </table>

 <!--After the user enters the score and submits, this table will be displayed with the 2 buttons below
-->
    <div id="divTable">
      <table id="tableScore" border="5" align="center">
        <th>No</th>
        <th>Name</th>
        <th>Math</th>
        <th>Physics</th>
        <th>Chemistry</th>
        <th>Average Score</th> <!--Only show table heading but the value must be show "?"-->
      </table>

      <!--User press this button and the average score will be calculated and substituted for the value "?" in the "Average Score" column.-->
      <button onclick="showAvg()" align="center">Calculate the average score</button>

      <!--This is to demonstrate the average score >= 8-->
      <button onclick="showBest()" align="center">
        Best student
      </button>
    </div>
  </body>

我的 JS 檔案：

var testScore = { 
    name: "",
    math: 0,
    physical: 0,
    chemistry: 0,
    avg: 0
};

var i = 1;
// Show the table after "Submit"
function score_table() {
    
    document.getElementById("divTable").style.display="block";

    // Gathering the data
    testScore.name = document.getElementById("name").value;
    testScore.math = document.getElementById("math").value;
    testScore.physical = document.getElementById("physics").value;
    testScore.chemistry = document.getElementById("chemical").value;

    // I know to calcualte the average score but i am struggle to show the value "?"
    testScore.avg = ((parseFloat(testScore.math)   parseFloat(testScore.physical)   parseFloat(testScore.chemistry)) / 3).toFixed(2);
    
    document.getElementById("name").value = "";
    document.getElementById("math").value = "";
    document.getElementById("physics").value = "";
    document.getElementById("chemical").value = "";

    // Add the data after submit
    var table = document.getElementById("tableScore");
    var row = table.insertRow(i);
    var number = row.insertCell(0);
    var name = row.insertCell(1);
    var math = row.insertCell(2);
    var physics = row.insertCell(3);
    var chemistry = row.insertCell(4);
    var avg = row.insertCell(5);
    
// Return the HTML value
    number.innerHTML  = i;
    name.innerHTML  = testScore.name;
    math.innerHTML  = testScore.math;
    physics.innerHTML  = testScore.physical;
    chemistry.innerHTML  = testScore.chemistry;
    avg.innerHTML  = testScore.avg;
    i  ;
}

// I want the calculated average score to replace the value "?" in the "Average Score" column
function showAvg() {
  document.getElementById("tableScore").querySelector("th:nth-child(6)").style.display = "block";
    var colAvg = document.getElementById("tableScore").querySelectorAll("td:nth-child(6n)");
    for (var i = 0; i < colAvg.length; i  ) {
      colAvg[i].style.display = "block";
    }
}

// If the average score >= 8  it will be red
function showBest() {
    var colAvg = document.getElementById("tableScore").querySelectorAll("td:nth-child(6n)");
    var rowAvg = document.getElementById("tableScore").querySelectorAll("tr:nth-child(1n)");
  
    for (var i = 0; i < colAvg.length; i  ) {
      var avg = parseFloat(colAvg[i].innerText);
      if (avg >= 8) {
        rowAvg[i   1].style.background = "red";
      } else {}
    }
  }

我的 CSS 檔案：

#divTable {
  display: none;
  text-align: center;
  width: 100%;
}

#tableScore th:nth-child(6),
#tableScore td:nth-child(6) {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
  display: none;
}

uj5u.com熱心網友回復：

去吧，享受它

var testScore = { 
    name: "",
    math: 0,
    physical: 0,
    chemistry: 0,
    avg: 0
};

var i = 1;
// Hi?n th? ra b?ng ?i?m sau khi nh?p
function score_table() {
    
    document.getElementById("divTable").style.display="block";

    // L?y d? li?u sau khi nh?p
    testScore.name = document.getElementById("name").value;// gán giá tr? tên theo id ? input
    testScore.math = document.getElementById("math").value;// gán giá tr? toán theo id ? input
    testScore.physical = document.getElementById("physics").value;// gán giá tr? v?t ly theo id ? input
    testScore.chemistry = document.getElementById("chemical").value;// gán giá tr? hóa h?c theo id ? input
    testScore.avg = "?";
    document.getElementById("name").value = "";// Xóa tr?ng các ? input c?a tên
    document.getElementById("math").value = "";// Xóa tr?ng các ? input c?a toán
    document.getElementById("physics").value = "";// Xóa tr?ng các ? input c?a v?t ly
    document.getElementById("chemical").value = "";// Xóa tr?ng các ? input c?a hóa h?c

    // Thêm d? li?u vào b?ng sau khi nh?p th?ng tin
    var table = document.getElementById("tableScore");
    var row = table.insertRow(i);// T?o table row theo v? trí
    var number = row.insertCell(0);// Table data ? v? trí ??u tiên
    var name = row.insertCell(1);// V? trí th? 2
    var math = row.insertCell(2);// V? trí th? 3
    var physics = row.insertCell(3);// V? trí th? 4
    var chemistry = row.insertCell(4);// V? trí th? 5
    var avg = row.insertCell(5);// V? trí th? 6
    
    number.innerHTML  = i;// Tr? v? n?i dung HTML
    name.innerHTML  = testScore.name;// Tên s? tr? v? các giá tr? ?? ???c nh?p
    math.innerHTML  = testScore.math;// Tr? v? giá tr? HTML c?a toán
    physics.innerHTML  = testScore.physical;// Tr? v? giá tr? HTML c?a ?i?m ly
    chemistry.innerHTML  = testScore.chemistry;// Tr? v? giá tr? HTML c?a ?i?m hóa
    avg.innerHTML  = testScore.avg;// Tr? v? giá tr? ?i?m trung bình
    i  ;
}

// 
function showAvg() {
  var table = document.getElementById('tableScore');
  var count = table.rows.length;
  for(var i = 0; i < count; i  ) {
  var math =  parseFloat(table.rows[i].cells[2].innerHTML);
  var physics =  parseFloat(table.rows[i].cells[3].innerHTML);
  var chemistry =  parseFloat(table.rows[i].cells[4].innerHTML);
  var avg = ((math   physics   chemistry)/3).toFixed(2);
  if (i > 0) {
    table.rows[i].cells[5].innerHTML = avg;
  }
}
}


// Xác ??nh n?u ?i?m >= 8 thì b?i ?? c?t và hàng ?ó
function showBest() {
    var colAvg = document.getElementById("tableScore").querySelectorAll("td:nth-child(6n)");
    var rowAvg = document.getElementById("tableScore").querySelectorAll("tr:nth-child(1n)");
  
    for (var i = 0; i < colAvg.length; i  ) {
      var avg = parseFloat(colAvg[i].innerText);
      if (avg >= 8) {
        rowAvg[i   1].style.color = "red";
      } else {}
    }
  }

哦，您還需要更改 CSS 檔案

#divTable {
  display: none;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

#tableScore th:nth-child(6),
#tableScore td:nth-child(6) {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

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