public Transform target;//獲取旋轉(zhuǎn)目標(biāo)

private void camerarotate() //攝像機(jī)圍繞目標(biāo)旋轉(zhuǎn)操作
    {
        transform.RotateAround(target.position, Vector3.up, speed*Time.deltaTime); //攝像機(jī)圍繞目標(biāo)旋轉(zhuǎn)
        var mouse_x = Input.GetAxis("Mouse X");//獲取鼠標(biāo)X軸移動
        var mouse_y = -Input.GetAxis("Mouse Y");//獲取鼠標(biāo)Y軸移動
        if (Input.GetKey(KeyCode.Mouse1))
        {
            transform.Translate(Vector3.left*(mouse_x*15f)*Time.deltaTime);
            transform.Translate(Vector3.up*(mouse_y*15f)*Time.deltaTime);
        }
        if (Input.GetKey(KeyCode.Mouse0))
        {
            transform.RotateAround(target.transform.position, Vector3.up, mouse_x*5);
            transform.RotateAround(target.transform.position, transform.right, mouse_y*5);
        }
    }

    private void camerazoom() //攝像機(jī)滾輪縮放
    {
        if (Input.GetAxis("Mouse ScrollWheel") > 0)
            transform.Translate(Vector3.forward*0.5f);


        if (Input.GetAxis("Mouse ScrollWheel") < 0)
            transform.Translate(Vector3.forward*-0.5f);
    }