1.效应器

Point Effector 2D： 点效应器。进入区域，吸引或排斥物体

Area Effector 2D： 区域效应器，可以用来做马里奥的管道移动效果

Surface Effector 2D ：表面效应器。实现传送带效果

PlatForm Effector 2D：平台效应器。实现2D游戏里面的台阶效果

2.控制移动

// Update is called once per frame
    void Update () {
        if (Input.GetKey(KeyCode.A))
        {
            MoveLeft();
        }
        if (Input.GetKey(KeyCode.D))
        {
            MoveRight();
        }
        if (Input.GetKeyDown(KeyCode.Space))
        {
            Jump();
        }
    }
        void MoveLeft()
    {
        var v = rgbd.velocity;
        v.x = -movespeed;
        rgbd.velocity = v;
        //gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.left * movespeed, ForceMode2D.Force);
    }

    void MoveRight()
    {
        var v = rgbd.velocity;
        v.x = movespeed;
        rgbd.velocity = v;
        //gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.right * movespeed, ForceMode2D.Force);
    }

    public void Jump()
    {
        if (isground)
        {
            gameObject.GetComponent<Rigidbody2D>().AddForce(Vector2.up * jumpspeed, ForceMode2D.Impulse);
            isground = false;
        }
        
    }

3.敌人来回移动

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

public class laihui : MonoBehaviour {

    public float movespeed=3.0f;
    private Vector2 currentposition;
    public float distnation=10.0f;
    private int face = 1;

    // Use this for initialization
    void Start () {
        currentposition = gameObject.transform.position;
    }
    
    // Update is called once per frame
    void Update () {
        if (face == 1)
        {
            gameObject.transform.Translate(Vector2.right * movespeed * Time.deltaTime);
        }
        if (face == 0)
        {
            gameObject.transform.Translate(Vector2.left * movespeed * Time.deltaTime);
        }
        if (gameObject.transform.position.x > currentposition.x+distnation)
        {
            face = 0;
        }
        if (gameObject.transform.position.x < currentposition.x)
        {
            face = 1;
        }
    }
}