如何在Javascript中计算对象数组中的值？

var objArray = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];

var sum = 0;
for (var i = 0; i < objArray.length; i++) {
  sum += objArray[i].age;
}

console.log('总年龄：' + sum);

var objArray = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];

var sum = objArray.reduce(function(total, currentValue) {
  return total + currentValue.age;
}, 0);

console.log('总年龄：' + sum);

var objArray = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];

var ageArray = objArray.map(function(obj) {
  return obj.age;
});

var sum = ageArray.reduce(function(total, currentValue) {
  return total + currentValue;
}, 0);

console.log('总年龄：' + sum);