UGUI检查鼠标是否点击到UI

void Update () {
if (Input.GetMouseButton(0))
{
if (EventSystem.current.IsPointerOverGameObject())  //检查是否点击到UI
//  if (EventSystem.current.IsPointerOverGameObject(Input.GetTouch(0).fingerId))  //如果要用于手机上，则使用这条
{
return;
}
x += Input.GetAxis("Mouse X") * 5;
y += Input.GetAxis("Mouse Y") * 5;
y = Mathf.Clamp(y, -90, 90);
transform.localEulerAngles = new Vector3(-y, x, transform.localEulerAngles.z);
}
}
}