显示没有值的单位

// 假设我们有一个数据数组
const data = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: null },
  { name: "Charlie", age: 30 }
];

// 渲染表格
function renderTable(data) {
  const table = document.createElement("table");
  const thead = document.createElement("thead");
  const tbody = document.createElement("tbody");

  // 创建表头
  const headerRow = document.createElement("tr");
  ["Name", "Age"].forEach(headerText => {
    const th = document.createElement("th");
    th.textContent = headerText;
    headerRow.appendChild(th);
  });
  thead.appendChild(headerRow);
  table.appendChild(thead);

  // 创建表体
  data.forEach(item => {
    const row = document.createElement("tr");
    const nameCell = document.createElement("td");
    nameCell.textContent = item.name || "N/A";
    const ageCell = document.createElement("td");
    ageCell.textContent = item.age !== null ? item.age : "N/A";
    row.appendChild(nameCell);
    row.appendChild(ageCell);
    tbody.appendChild(row);
  });
  table.appendChild(tbody);

  document.body.appendChild(table);
}

renderTable(data);