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BottomNavigation 拓展：毛玻璃底部导航栏 · App Inventor 2 中文网
...一枚跟随滑动的药丸形指示器。
.aix 拓展下载：
cn.fun123.BottomNavigation.aix
快速上手
下方示例按内置组件写法展示（拖入即用，没有初始化方法）——调色板短名「BottomNavigation」
如今指向内置版，文档站...
Find rows that have the same value on a column in MySQL
...* FROM member WHERE email = (Select email From member Where login_id = john123@hotmail.com)
This will return all records that have john123@hotmail.com as a login_id value.
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How to make connection to Postgres via Node.js
...Postgres database.
The interface in node.js that I used can be found here https://github.com/brianc/node-postgres
var pg = require('pg');
var conString = "postgres://YourUserName:YourPassword@localhost:5432/YourDatabase";
var client = new pg.Client(conString);
client.connect();
//queries are que...
Using HTML5/Canvas/JavaScript to take in-browser screenshots
...ent's entire desktop using getUserMedia():
Have a look at this example:
https://www.webrtc-experiment.com/Pluginfree-Screen-Sharing/
The client will have to be using chrome (for now) and will need to enable screen capture support under chrome://flags.
...
Supabase 拓展：App 接入 Supabase 后端服务（Auth + PostgreSQL + Storage...
...se 控制台，进入项目的 Settings > API，获取：
Project URL：https://xxxxx.supabase.co
anon public key：eyJ...（公钥，可安全嵌入客户端）
2. 配置 Auth 组件
在设计器中拖入 SupabaseAuth，设置属性：
ProjectUrl：填入 Project U...
Can a variable number of arguments be passed to a function?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Vertically centering a div inside another div [duplicate]
...sed (50%) instead of (-50%) on translateY...
– jumps4fun
Apr 13 '15 at 11:50
4
I love this soluti...
Summarizing multiple columns with dplyr? [duplicate]
...u want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package provides the same functionality:
library(purrrlyr)
df %>% slice_rows("grp") %>% dmap(mean)
#> # A tibble: 3 x 5
#> grp a b c d
#> <int>...
MLKitCodeScanner 拓展：离线条码 / 二维码识别 · App Inventor 2 中文网
...abi-v7a + x86 + x86_64（含模拟器）。
.aix 拓展下载：
cn.fun123.MLKit.CodeScanner.aix
快速上手
一、扫图片里的二维码
设计器里放一个 MLKitCodeScanner、一个按钮、一个标签，再放一个「图像选择器...
MLKitHandwriting 拓展：手写识别（写字变文字） · App Inventor 2 中文网
...已打包在 .aix 里，不需要下载。
.aix 拓展下载：
cn.fun123.MLKit.Handwriting.aix
快速上手
一、写字识别（最小可用）
设计器摆放：
一个画布（Canvas），宽度「充满」、高度 300 像素，画笔...