根据多个条件和可能的未定义值对对象数组进行排序

function sortByConditions(arr, conditions) {
  return arr.sort((a, b) => {
    for (let condition of conditions) {
      let prop = condition.property;
      let order = condition.order || 'asc';
      let undefinedValue = condition.undefinedValue || Number.MAX_VALUE;

      let aValue = a[prop] !== undefined ? a[prop] : undefinedValue;
      let bValue = b[prop] !== undefined ? b[prop] : undefinedValue;

      if (aValue < bValue) {
        return order === 'asc' ? -1 : 1;
      } else if (aValue > bValue) {
        return order === 'asc' ? 1 : -1;
      }
    }
    return 0;
  });
}

let objects = [
  { name: 'Alice', age: 25, score: 80 },
  { name: 'Bob', age: 30, score: 90 },
  { name: 'Charlie', age: 20 },
  { name: 'David', age: 25, score: 85 },
];

let conditions = [
  { property: 'age', order: 'asc' },
  { property: 'score', order: 'desc', undefinedValue: 0 },
];

let sortedObjects = sortByConditions(objects, conditions);
console.log(sortedObjects);

[
  { name: 'Charlie', age: 20 },
  { name: 'David', age: 25, score: 85 },
  { name: 'Alice', age: 25, score: 80 },
  { name: 'Bob', age: 30, score: 90 }
]