演示应用 — 你已在上方看到过它的截图。我创建了一个包含三个函数的演示：change_background_color（更改背景颜色）、change_app_title（更改标题）和show_alert（显示警告对话框）。
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16 January 2026ShareSave
Apple's mobile devices are secure enough for NATO. Following extensive testing by the German government, the iPhone and iPad are now considered secure enough for the NATO-restricted classified level.