当前热控件的 controlID。
热控件是临时处于活动状态的控件。当用户在按钮上按下鼠标时，它会变为热控件。
当其他控件处于热状态时，不允许其他任何控件响应鼠标事件。
当用户松开鼠标时，控件会将hotControl设置为 0，以指示其他控件现在可以响应用户输入。
using UnityEngine;
public class Example : MonoBehaviour { // Click on the button to see the id
void OnGUI() { GUILayout.Button("Press Me!"); Debug.Log("id: " + GUIUtility.hotControl); } }
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