Unity Input.GetMouseButtonDown 拿到鼠标按键

//点击按键，生成子弹，并射向前方
    void ShootBullet()
    {
        if (Input.GetMouseButtonDown(0))
        {
            GameObject temp_Buller = GameObject.Instantiate(bulletPrefab, new Vector3(playerTransform.position.x, playerTransform.position.y, playerTransform.position.z + 0.37f), Quaternion.identity);

            temp_Buller.GetComponent<Rigidbody>().velocity = Vector3.forward * bulletSpeed;
        }
    }