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Scratch还是App Inventor？低代码编程工具2026终极横评：谁才是真正的入门...
...化，作品分享平台成熟
App Inventor 2：中文社区（如fun123.cn）本土化完善
维度：进阶路径
Scratch：→ Python/JavaScript
App Inventor 2：→ Python/Java/Kotlin
详细对比
场景1：给小学生做编程启蒙
如果你的孩子刚上小学，从来没...
OfflineSpeech 拓展：离线语音识别 · App Inventor 2 中文网
...擎 Vosk(Kaldi)。
默认中文小模型开箱即用（vosk-model-small-cn-0.22，zip 约 42MB，Apache 2.0 开源协议）：调用 LoadDefaultModel 即可——本地已有缓存就直接加载；没有就首次联网自动下载并缓存（进度经 ModelProgress 事件提示），之后全程...
keytool error :java.io.IoException:Incorrect AVA format
...PatrickTaylor -validity 10000
-keystore C:\drops\patrickkeystore
-dname "cn=Patrick Taylor, ou=engineering, o=company, c=US"
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Vertically centering a div inside another div [duplicate]
...sted in:
FF3.5+
FF4+
Safari 5+
Chrome 11+
IE9+
HTML
<div class="cn"><div class="inner">your content</div></div>
CSS
.cn {
display: table-cell;
width: 500px;
height: 500px;
vertical-align: middle;
text-align: center;
}
.inner {
display: inline-block;
...
CSS to stop text wrapping under image
... to use a <p> element as a parent for your <span>.
<li id="CN2787">
<img class="fav_star" src="images/fav.png">
<p>
<span>Text, text and more text</span>
</p>
</li>
Since <p> is a block element, you can set its width using CSS...
为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
来源中文网文档：https://www.fun123.cn/reference/extensions/aix_dev.html
为什么需要开发拓展？App Inventor 2 是积木式在线安卓开发环境，利用拖拽式的方式实现代码块堆叠，从而完成相应的逻辑。上手很容易，但是由于代码块提供的功能...
How do I find out which keystore was used to sign an app?
...oid.youtube-10.39.54-107954130-minAPI15.apk
Signer #1:
Signature:
Owner: CN=Unknown, OU="Google, Inc", O="Google, Inc", L=Mountain View, ST=CA, C=US
Issuer: CN=Unknown, OU="Google, Inc", O="Google, Inc", L=Mountain View, ST=CA, C=US
Serial number: 4934987e
Valid from: Mon Dec 01 18:07:58 PST 2008 ...
Received fatal alert: handshake_failure through SSLHandshakeException
... section for the same, that starts as:
adding as trusted cert:
Subject: CN=blah, O=blah, C=blah
Issuer: CN=biggerblah, O=biggerblah, C=biggerblah
Algorithm: RSA; Serial number: yadda
Valid from SomeDate until SomeDate
You'll need to look for if the server's CA is a subject.
The handshak...
How do you calculate the average of a set of circular data? [closed]
...a[i]-x
c = subset of a where the correct (angular) difference (a[i]-360)-x
cn = size of c
d = subset of a where the correct (angular) difference (a[i]+360)-x
dn = size of d
y = sum((b[i]-x)^2) + sum(((c[i]-360)-b)^2) + sum(((d[i]+360)-c)^2)
= sum(b[i]^2 - 2*b[i]*x + x^2)
+ sum((c[i]-360)^2 - 2*(c...
Converting a Java Keystore into PEM Format
...
bash$ keytool -keystore foo.jks -genkeypair -alias foo \
-dname 'CN=foo.example.com,L=Melbourne,ST=Victoria,C=AU'
Enter keystore password:
Re-enter new password:
Enter key password for
(RETURN if same as keystore password):
bash$ keytool -keystore foo.jks -exportcert -alias f...