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提问 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
使用下面程序时，为什么每次都会把实际数字设为0？
问题出在你的判断逻辑上：
这里和你拼接的字符串比较，非常容易出错，比如多了或少了一个空格等。实际编程中判断最好使用数字，也就是你选择了...
最大装载数不显示计算数值 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
计算公示如下：
（排数输出-高数输出）×横数输出+（高数输出×横数输出）÷2＝最大装载数
出现问题不显示计算数字代码块没有问题，经过测试是能够正确计算出除法结果的，测试时主要被除数要大于除数，否则计算结果0.x...
菜品识别的API有哪些？ - App应用开发 - 清泛IT社区，为创新赋能！
目前找到的有百度和阿里，做菜品识别api，文档地址分别如下：
百度云：https://cloud.baidu.com/doc/IMAGERECOGNITION/s/tk3bcxbb0
阿里云：https://help.aliyun.com/zh/viapi ... a2c4g.11186623.0.i0
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食物营养成分识别：https://www.tian...
AppInventor2画布的坐标原点是哪里？ - App应用开发 - 清泛IT社区，为创新赋能！
Q：AppInventor2画布的坐标原点在哪里，是中心吗？
A：画布的左上边缘是 0,0 原点。
开发AppInventor2拓展时，依赖第三方jar库怎么写？ - App Inventor 2 拓展 ...
...多个英文逗号分隔[size=0.8em]Java
相应的 jar 库要放到 appinventor-sources\appinventor\lib 目录下，修改编译配置文件 appinventor-sources\appinventor\components\build.xml ：配置文件中搜索 <target name="CopyComponentLibraries"，尾部加上库拷贝...
Ubuntu, vim, and the solarized color palette
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order apparently matters as well. i found that set t_Co=16 after colorscheme solarized doesn't work. you have to set t_Co before the colorscheme.
– rev
Jan 3 '12 at 18:48
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Xcode 'Build and Archive' menu item disabled
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Why? Because Apple almost only does user experience testing for non-developers, clearly.
– Luke Stanley
Jan 22 '13 at 17:10
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Storing custom objects in an NSMutableArray in NSUserDefaults
I've recently been trying to store the search results of my iPhone app in the NSUserDefaults collection. I also use this to save user registration info successfully, but for some reason trying to store my NSMutableArray of custom Location classes always comes back empty.
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How to solve privileges issues when restore PostgreSQL Database
...er-name> superuser" are not congruent. Proper ownership would mean that app_user is not a super user.
– Mark E. Haase
Jun 5 '15 at 19:28
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How do I create a nice-looking DMG for Mac OS X using command-line tools?
I need to create a nice installer for a Mac application. I want it to be a disk image (DMG), with a predefined size, layout and background image.
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