public float speed = 6.0F;
    public float jumpSpeed = 8.0F;
    public float gravity = 20.0F;
    private Vector3 moveDirection = Vector3.zero;

void Update() {
        CharacterController controller = GetComponent<CharacterController>();
        if (controller.isGrounded) {
            moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
            moveDirection = transform.TransformDirection(moveDirection);
            moveDirection *= speed;
            if (Input.GetButton("Jump"))
                moveDirection.y = jumpSpeed;
            
        }
        moveDirection.y -= gravity * Time.deltaTime;
        controller.Move(moveDirection * Time.deltaTime);
    }

上面是官方给出的例子，由于检测移动是只能在地面上才能用，所以要将检测移动的代码移出至判定外。 但是将判定位移移出后Y轴将会一直为0，所以需要定义一个变量用来计算当前Y轴方向速度。

修改后代码：

 public float speed = 6.0F;
    public float jumpSpeed = 8.0F;
    public float gravity = 20.0F;
　　 public float verVel  = 0;                    //vertical velocity
    private Vector3 moveDirection = Vector3.zero;

void Update() {
        CharacterController controller = GetComponent<CharacterController>();

 　　　　 moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
　　　　  moveDirection = transform.TransformDirection(moveDirection);
        moveDirection *= speed;

        if (controller.isGrounded) {
        　　if (Input.GetButton("Jump"))
               moveDirection.y = jumpSpeed;            
        }
        verVel = -= gravity * Time.deltaTime;
        moveDirection.y = verVel;
        controller.Move(moveDirection * Time.deltaTime);
    }

原创：http://www.cnblogs.com/m-f-s/

unity CharactorController下Move()官方示例下跳跃时主角无法移动操作问题。