void OnGUI()    {        if(GUILayout.RepeatButton("加血"))        {            if(HP<100)            {                HP++;            }        }        if(GUILayout.RepeatButton("减血"))        {            if(HP>0)            {                HP--;            }        }        int blood_width=blood_Red.width * HP/100;        GUI.DrawTexture(new Rect(100,100,blood_Black.width,blood_Black.height),blood_Black);        GUI.DrawTexture(new Rect(100,100,blood_width,blood_Red.height),blood_Red);    }