C# （15,1）：错误CS0120:非静态字段、方法或属性“GameObject.GetComponent（string）”需要对象引用

我正在编程

using UnityEngine;

public class playermove : MonoBehaviour
{
    public float moveSpeed=5f;

    // Update is called once per frame
    void Update()
    {
        jump();
        Vector3 movment = new Vector3(Input.GetAxis("Horizontal"),0f ,0f);
        transform.position += movment * Time.deltaTime * moveSpeed; 
    }

    void jump() 
    {
        if (Input.GetButtonDown("jump")) 
        {
            GameObject.GetComponent("RigidBody2D")().AddForce(new Vector2(0f,5f),ForceMode2D.Impulse);
        }
    }
}

我遇到了这个问题：

15,1:错误CS0120:非静态字段、方法或属性“GameObject.GetComponentstring”需要对象引用。

GameObject是类的名称。错误是告诉你一个对象是预期的，换句话说，一个特定的游戏对象实例，比如玩家

乙二醇

GameObject player = GameObject.Find("player");
player.GetComponent("RigidBody2D").AddForce(new Vector2(0f,5f),ForceMode2D.Impulse);