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Rails 3.1 and Image Assets
....png
Because the assets/images folder gets generated along with a new 3.1 app, this is the convention that they probably want you to follow. I think that's where image_tag will look for it, but I haven't tested that yet.
Also, during the RailsConf keynote, I remember D2h saying the the public fold...
Clipboard 拓展：实现剪贴板的复制粘贴功能 - App Inventor 2 拓展 - 清泛I...
此Clipboard 拓展由中文网开发及维护，最新版本 v1.0，目前仅对会员免费。使用方法属性及方法很简单，默认操作成功后显示提示信息，SuppressToast设置为 假 后，则不显示提示信息。
经测试，可跨屏幕共享剪贴板数据，可作为屏...
Bad arguments to +：The operation + cannot accept the arguments:, [&qu...
原因是加号+前面是空字符串，不能有效地转换成数字，所以报错。
比如"123"这个字符串可以自动转数字，但是空文本不行。
文本要判断空，然后给数字 0。
同理，空文本不但不能转数字，也不能转列表、字典...
appinventor2中求某个值在列表中的索引用什么方法？ - App Inventor 2 中文...
使用“求对象在列表中的位置”方法就可以了：
返回指定对象在列表中的位置，从 1 开始，如果不在列表中，则返回 0。
相应地，知道了索引，从列表中取值得方法是：选择列表中索引值对应的列表项返回给定列表中给定索...
怎么解决MQTT连接掉线，自动连接问题，同时解决，反复断开连接，断开连接问...
解决MQTT退出后台后掉线自动连接问题，现在可以实现自动连接，但是在返回控制界面的时候，反复断开反复链接，还有切换页面的时候返回也是同样的问题，还有连接一个服务器，需要每个页面单独设置MQTT连接吗，是不是可以...
想试着做一个间歇运动的计时器 - App应用开发 - 清泛IT社区，为创新赋能！
本帖最后由 碳水哥斯拉 于 2025-05-08 23:37 编辑
用deepseek生成了代码 使用AI2 遇到了问题
to formatTime seconds
  set minutes to (seconds / 60)
  set secs to (seconds - (minutes * 60))
  return join strings( padZero(minutes), ":",...
标签的“具有外边距”有啥用？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
https://www.fun123.cn/reference/ ... ml#Label.HasMargins
待研究。
Object lp = view.getLayoutParams();
    // The following instanceof check will fail if we have not previously
    // added the label to the container (Why?)
    if (lp instanceof ViewGroup.Margin...
Docker and securing passwords
...ker on the host also has root anyway.)
My preferred pattern is to use a wrapper script as the ENTRYPOINT or CMD. The wrapper script can first import secrets from an outside location in to the container at run time, then execute the application, providing the secrets. The exact mechanics of this var...
Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
Can one develop an entire application using JavaFX and run it on iOS, Android or Windows Phone 8, without writing platform-specific code?
...
How can I handle time zones in my webapp?
... even better would be to save the timezone the device was set to when your app was first run, and then see if it ever changes. If it does change, then the user is probably a traveller and would probably benefit from having the timezone dropdown. Otherwise, just don't show the dropdown and default to...