Method shake

packages/fairygui/src/tween/GTween.ts:127–134

* Create a shake tween * 创建震动补间

(
        startX: number,
        startY: number,
        amplitude: number,
        duration: number
    )

     * 创建震动补间
     */
    public static shake(
        startX: number,
        startY: number,
        amplitude: number,
        duration: number
    ): GTweener {
        return TweenManager.createTween()._shake(startX, startY, amplitude, duration);
    }

    /**
     * Check if target is being tweened