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-
-用例名：背景切换功能
-业务目标：在用户点击切换背景的按钮后，可以切换背景
-执行者：使用者
-前置条件：小米便签进入主页面
-基本交互动作：
-1.接受到使用者切换背景图片的请求
-1.1切换背景图片
-
-
-
-用例名：登录
-业务目标：用户输入账号密码正确后，是用户进入使用界面
-执行者：用户
-前置条件：小米便签开始运行
-基本交互动作：
-1、验证用户身份:
- 1.1用户输入用户名，密码
- 1.2系统验证用户身份成功后登录
-扩展交互动作：
-1a.用户密码错误，提示用户密码出错，使用户重新输入。
-1a1.输入正确登入。
-
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