JavaScript搜索对象数组和返回父级的索引

const array = [
  { id: 1, name: 'Alice', parent: null },
  { id: 2, name: 'Bob', parent: 1 },
  { id: 3, name: 'Charlie', parent: 2 },
  { id: 4, name: 'David', parent: 2 },
  { id: 5, name: 'Eve', parent: 1 }
];

const index = array.findIndex(item => item.name === 'Charlie');
console.log(index); // 输出 2

function findParentIndex(array, childIndex) {
  const child = array[childIndex];
  if (child.parent === null) {
    return null; // 如果父级为null，则返回null表示没有找到父级
  }
  const parentIndex = array.findIndex(item => item.id === child.parent);
  if (parentIndex === -1) {
    return null; // 如果找不到父级，则返回null表示没有找到父级
  }
  return parentIndex;
}

const childIndex = array.findIndex(item => item.name === 'Charlie');
const parentIndex = findParentIndex(array, childIndex);
console.log(parentIndex); // 输出 1