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

public class myMove : MonoBehaviour
{
    private Rigidbody2D rb;
    private BoxCollider2D coll;
    private float ability = 1;//角色能力属性，更改其大小可以改变速度等
    public float speed = 1f;
    private bool if_Jump = true;//判断物体是否悬空，悬空则为false
    private float yposition;//记录物体上一次的y轴坐标

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        coll = GetComponent<BoxCollider2D>();
        Vector2 position = transform.position;
        yposition = position.y;
    }

    private void FixedUpdate()
    {
        float horizintal = Input.GetAxis("Horizontal");
        float vertical = Input.GetAxis("Jump");
        Vector2 position = transform.position;
        position.x = position.x + speed * ability * horizintal;
        if (Input.GetButton("Jump") && if_Jump)
        {
            position.y = position.y + speed * ability * vertical;
            if_Jump = false;
        }
        //判断是否有空格键且是否处于悬空状态
        if (yposition == position.y)
        {
            if_Jump = true;
        }
        //判断是否落地
        yposition = position.y;
        transform.position = position;
    }

}

以上为实现角色2D平台跳跃脚本