if (Input.GetKey(KeyCode.A))
    //if (touchKey_x < -0.1f)
    {
        transform.localEulerAngles = new Vector3(0,180,0);
        if (Camera.main.WorldToScreenPoint(transform.position).x > 20)  //小玛丽不能超出坐屏幕
        {
            transform.Translate(Vector3.right * runSpeed * Time.deltaTime * Mathf.Abs(touchKey_x)); //移动位置
        }
        runAnim();
    }
    
    if (Input.GetKey(KeyCode.D))
    //else if (touchKey_x > 0.1f)
    {
        transform.localEulerAngles = new Vector3(0, 0, 0);
        transform.Translate(Vector3.right * runSpeed * Time.deltaTime * Mathf.Abs(touchKey_x));
        runAnim(); 
    }

    if (Input.GetKeyDown(KeyCode.W) && isGround)
    //if (isTouchJump()&&isGround)
    {
        World.playAudio(World.jumpAudioIndex);
        rigidbody2D.velocity = new Vector2(0, jumpSeed);
        jumpAnim();
    }