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-基本交互动作：
-
-1.用户点击添加图片按钮。
-
-2.手机打开相册，判断图片是否存在。
-
-3.图片存在则返回图片的路径。
-
-4.在编辑光标处插入要添加的图片。
-
-5.更新数据库的数据
-
-扩展交互动作:
-
-2a.没有可以添加的图片。
-
-2a1 取消添加图片。
-