【unity2D横板】【sunnyland】角色的跳跃

public float jumpForce;
public float jumpAddForce;
public float jumpTime;
public float jumpStartTime;
public bool  isjump;//是否在跳跃  
private void jump()
    {
        if (Input.GetKeyDown(KeyCode.Space))//按下按钮的时候开始检测
        {
            isjump = true;
            rb2d.velocity = Vector2.up * jumpForce;//Vectors.up是一种简写形式，单看这个单词也能明白意思吧，本来我也设想过用改变坐标的形式来进行跳跃但是很违和，所以我找到了添加力的方式来进行跳跃，看起来很自然，舒服。
            jumpTime = jumpStartTime;
        }
        if(Input.GetKey(KeyCode.Space)&&isjump == true)//这里是长按跳跃键时最多上升到什么时候
        {
            if(jumpTime > 0)
            {
                rb2d.velocity = Vector2.up * jumpForce;
                jumpTime -= Time.deltaTime;
            }
        }
        else
        {
            isjump = false;//跳跃时间到，停止
        }
        if (Input.GetKeyUp(KeyCode.Space))//放下跳跃键也停止跳跃
        {
            isjump = false;
        }
    }