计算多个字段的值，并在Javascript中显示每一行

var data = [
  { field1: 10, field2: 20, field3: 30 },
  { field1: 40, field2: 50, field3: 60 },
  { field1: 70, field2: 80, field3: 90 }
];

for (var i = 0; i < data.length; i++) {
  var row = data[i];
  var sum = row.field1 + row.field2;
  row.sum = sum; // 将计算结果保存到新的字段sum中
}

var table = document.createElement('table');

for (var i = 0; i < data.length; i++) {
  var row = data[i];
  var tr = document.createElement('tr');

  // 创建并添加每个字段的单元格
  var td1 = document.createElement('td');
  td1.textContent = row.field1;
  tr.appendChild(td1);

  var td2 = document.createElement('td');
  td2.textContent = row.field2;
  tr.appendChild(td2);

  var td3 = document.createElement('td');
  td3.textContent = row.field3;
  tr.appendChild(td3);

  var tdSum = document.createElement('td');
  tdSum.textContent = row.sum;
  tr.appendChild(tdSum);

  table.appendChild(tr);
}

// 将表格添加到页面中的某个元素中
var container = document.getElementById('container');
container.appendChild(table);