Unity查找自身为第几个子物体

API  GetSiblingIndex();

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GetChild_ID : MonoBehaviour
{
    public int IDD;
    public  Transform parent;
    // Start is called before the first frame update
    void Start()
    {
        parent = this.transform.parent;
        IDD = this.transform.GetSiblingIndex();
    }
}