程式碼分為三部分：

1. Update()中的輸入判定程式碼
2. LateUpdate()中的跳躍實現部分
3. OnCollisionEnter()與OnCollisionExit()的落地&離地檢測部分

當玩家按下跳躍鍵時進入跳躍狀態並判斷當前的水平速度

        //跳躍判定
        if (Input.GetButtonDown("Jump") &&nextJump)            //不能在落地前跳躍
            if (currentBaseState.fullPathHash == walkingState|| 
                currentBaseState.fullPathHash == runningState||
                currentBaseState.fullPathHash == standingState)//不能在動畫完成前跳躍
 

            {
                nextJump = false;//落地前無法再次起跳
                GameManager.isJumping = true;//進入跳躍狀態
                if (GameManager.isStanding)
                {
                    jumpV_x = 0;//處於站立狀態時水平初速度為0
                    GameManager.isStanding = false;//改變當前狀態由站立到跳躍，下同
                }
                if
 
 (GameManager.isWalking)
                {
                    jumpV_x = Haxis * moveSpeed;
                    GameManager.isWalking = false;
                }
                if (GameManager.isRunning)                //加速跳躍
                {
                    jumpV_x = Haxis * moveSpeed;
                    jumpVelocity = GameManager.jumpVelocity * GameManager.jumpMultiple;//加速跳躍時豎向分速度也提高
 

                    GameManager.isRunning = false;
                }
            }

當跳躍狀態==true時每幀移動相應的豎向，水平距離

    private void LateUpdate()
    {
        transform.Translate(Vector3.right * Time.deltaTime * moveSpeed * Haxis); //角色移動實現
        if (GameManager.isJumping)                   //跳躍實現
        {

            jumpHight += jumpVelocity * Time.deltaTime * jumpSpeed;
            jumpVelocity = jumpVelocity - 9.8f * Time.deltaTime * jumpSpeed;
            currentPosition.y = jumpHight;
            currentPosition.x = privousPosition.x + Time.deltaTime * jumpV_x; //空中水平移動實現
            transform.position = currentPosition;

        }

落地以後退出跳躍狀態，允許進行下次跳躍，並將跳躍速度的全域性變量回歸初始值以便下次跳躍

    void OnCollisionEnter(Collision collider)
    {
        //落地檢測
        if (collider.gameObject.tag == "Ground")
        {
            nextJump = true;
            GameManager.isGround = true;
            GameManager.isJumping = false;

            //落地還原速度
            moveSpeed = GameManager.moveSpeed;           
            jumpVelocity = GameManager.jumpVelocity;
            jumpHight = 0;
            jumpV_x = 0;

            Debug.Log("ground!");
        }
    }
    void OnCollisionExit(Collision collider)
    {
        //離地檢測
        if (collider.gameObject.tag == "Ground")
            GameManager.isGround = false;
        Debug.Log("offground!");
    }