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https://bbs.tsingfun.com/thread-2912-1-1.html 

ImagePicker 图像选择器如何一次选择多张图片? - App Inventor 2 中文网 -...

...的手机可以选择多张,纯猜测未验证。英文社区也有相关问题,目前没有得到正面回答,大概只有通过拓展解决。 拓展已上线,用法很简单: 拓展下载地址:https://www.fun123.cn/reference/extensions/MultiImagePicker.html
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CircularlmageBar cannot accept the arguments: , [com.google.appinvento...

CircularlmageBar cannot accept the arguments: , [com.google.appinventor .components.runtime .Image@f3f6c0d], I''],.... 原因:温度数据为空导致的,加一个非空判断即可解决问题
https://bbs.tsingfun.com/thread-2963-1-1.html 

App Inventor 2 接入腾讯云 CloudBase:让你的 App 瞬间拥有专业级后端能力...

...- 获取临时访问链接 - DeleteFile(fileList) - 删除文件 常见问题 Q:CloudBase 需要付费吗? A:CloudBase 提供免费额度,满足大多数学习和轻量应用场景。当应用规模增长后,可平滑升级到付费套餐。 Q:数据安全吗? A:数据存...
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Python: List vs Dict for look up table

... than both list and set for large data sets, running python 2.7.3 on an i7 CPU on linux: python -mtimeit -s 'd=range(10**7)' '5*10**6 in d' 10 loops, best of 3: 64.2 msec per loop python -mtimeit -s 'd=dict.fromkeys(range(10**7))' '5*10**6 in d' 10000000 loops, best of 3: 0.0759 usec per loop py...
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兼容主流浏览器的JS复制内容到剪贴板 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...个方法也就失效了。 那么如何解决这个“真实操作”的问题呢?可以使用一个JavaScript库:Zero Clipboard,利用这个js库可以支持利用flash 10 实现复制到剪贴板。这个方法原理是在一个透明的flash(对用户来说是不可见的)上覆盖一...
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How do you performance test JavaScript code?

CPU Cycles, Memory Usage, Execution Time, etc.? 22 Answers 22 ...
https://www.tsingfun.com/ilife/life/714.html 

程序员:编程能力与编程年龄的关系 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...入年龄,这些用户都被过滤了。 用户在2012年内都回答过问题。因为StackOverflow在2012年对问题和答案的质量要求得比以前高了一倍,所以更能反映程序员的真实水平。 Reputation声望在2-100K之间。(注:StackOverflow的用户Reputation是得...
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How do I get time of a Python program's execution?

... User time (seconds): 0.08 System time (seconds): 0.02 Percent of CPU this job got: 98% Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.10 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kby...
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Creating JSON on the fly with JObject

...upply single quote delimited JSON text. JObject o = JObject.Parse(@"{ 'CPU': 'Intel', 'Drives': [ 'DVD read/writer', '500 gigabyte hard drive' ] }"); This has the nice benefit of actually being JSON and so it reads as JSON. Or you have test data that is dynamic you can use JObject...
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Manipulate a url string by adding GET parameters

... performance, since this will be a lot faster than parse_url and also less cpu intensive. Tradeoff is that it is not checking for an existing $varName. – Dennis Stücken Apr 4 '18 at 12:13 ...