但是它是檢測滑鼠雙擊事件的，我們需要進行鍵盤上的單擊和雙擊。所以在他的基礎上進行進一步修改：

private bool keyDownStatus;
private int keyDownCount;
private float lastTime;
private float currentTime;

//key -> 要監聽的按鍵， timeElapse -> 雙擊之間最大時間間隔
bool DoubleClick(KeyCode key, float timeElapse) {
        //down --> mouseDownStatus = true; //up --> mouseDownStatus = false
 

        if (Input.GetKeyDown(key)) {
            if (!keyDownStatus) {
                keyDownStatus = true;
                //Debug.Log("clicked");
                if (keyDownCount == 0) {// 如果按住數量為 0
                    lastTime = Time.realtimeSinceStartup;// 記錄最後時間
                }
                keyDownCount++;
            }
        }
        if
 
 (Input.GetKeyUp(key)) {
            keyDownStatus = false;
        }
        if (keyDownStatus) {
            if (keyDownCount >= 2) {
                currentTime = Time.realtimeSinceStartup;
                if (currentTime - lastTime < timeElapse) {
                    lastTime = currentTime;
                    keyDownCount = 0
 
;
                    //Debug.Log("Double clicked");
                    return true;//返回結果，確認雙擊
                }
                else {
                    lastTime = Time.realtimeSinceStartup;  // 記錄最後時間
                    keyDownCount = 1;
                }
            }
        }
        return false;
    }