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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
...图的边界，值是一个包含了西北和东南坐标的嵌套列表，格式为((北西)(南东))CenterFromString地图中心Set the initial center coordinate of the map. The value is specified as a comma-separated pair of decimal latitude and longitude coordinates, for example, 42.359144, -71....
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...先为要存储的数据建立字段，随时可以存储自定义的数据格式。而在关系数据库里，增删字段是一件非常麻烦的事情。如果是非常大数据量的表，增加字段简直就是一个噩梦。
高可用，NoSQL在不太影响性能的情况，就可以方便...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...oder.java
Android版本：支持普通版本和Android 10+版本
文件格式：仅支持 GIF 动画文件
透明度：支持颜色遮罩实现透明效果
交互性：支持点击事件响应
内存使用：根据GIF大小和帧数而定
注意事项
Image组...
Convert JavaScript string in dot notation into an object reference
...yHandler);
}
Demo:
var obj = {a:{b:{c:1, d:2}}};
console.log("obj is:", JSON.stringify(obj));
var objHyper = hyperIndexOf(obj);
console.log("(proxy override get) objHyper['a.b.c'] is:", objHyper['a.b.c']);
objHyper['a.b.c'] = 3;
console.log("(proxy override set) objHyper['a.b.c']=3, now obj is:"...
What is a correct mime type for docx, pptx etc?
...
Here is the (almost) complete file extensions's MIME in a JSON format.
Just do example: MIME["ppt"], MIME["docx"], etc
{"x3d": "application/vnd.hzn-3d-crossword", "3gp": "video/3gpp", "3g2": "video/3gpp2", "mseq": "application/vnd.mseq", "pwn": "application/vnd.3m.post-it-notes", "...
How do search engines deal with AngularJS applications?
...the initial payload into the first response from the server, possibly as a JSON object. This allows the Search Engine to render the page without executing the AJAX call.
There is some evidence to suggest that Google might not execute AJAX requests. More on this here:
https://web.archive.org/web/20...
Git Symlinks in Windows
...member to check the symlink checkbox and clone my project again. My tslint.json file referencing the file in the parent directory still contains ../tslint.json. Pity, because this really looked like the easiest of all of the solutions proposed in there.
– Jan Aagaard
...
mongoose vs mongodb (nodejs modules/extensions), which better? and why?
...er level and uses the MongoDB driver (it's a dependency, check the package.json), so you'll be using that either way given those options. The question you should be asking yourself is, "Do I want to use the raw driver, or do I need an object-document modeling tool?" If you're looking for an object m...
In Firebase, is there a way to get the number of children of a node without loading all the node dat
...
Just to point out that you have to append .json to the end of the URL, for example: https://yourapp.firebaseio.com/posts/comments.json?shallow=true
– Osama Xäwãñz
Aug 12 '17 at 15:37
...
What MIME type should I use for CSV?
...</td></tr><tr><td>Apps Scripts</td><td>JSON</td><td>application/vnd.google-apps.script+json</td></tr></tbody></table>
Source here:
https://developers.google.com/drive/v3/web/manage-downloads#downloading_google_documents
t...