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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
... SocketFactory 不匹配。以“tcp://”开头的 URI 必须使用 javax.net.SocketFactory，以“ssl://”开头的 URI 必须使用 javax.net.ssl.SSLSocketFactory。由于包装器的实现，不会发生此错误。
URI and SocketFactory do not match.
32106
SSL 配...
How to force a web browser NOT to cache images
...close();
// no-cache headers - complete set
// these copied from [php.net/header][1], tested myself - works
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Some time in the past
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache,...
Apache and Node.js on the Same Server
...ets):
<IfModule mod_ssl.c>
<VirtualHost *:443>
ServerName www.example.com
ServerAlias www.example.com
DocumentRoot /var/html/www.example.com
ErrorLog /var/html/log/error.log
CustomLog /var/html/log/requests.log combined
SSLCertificateFile /etc/letsencrypt/live/ww...
Difference between freeze and seal
...or one, seal also makes existing properties non-configurable, see jsfiddle.net/btipling/6m743whn Number 2, you can still edit, that is change the values of existing properties on a sealed object.
– Bjorn
Aug 23 '14 at 23:02
...
Sound effects in JavaScript / HTML5
...udio> element, using a little Flash object from http://flash-mp3-player.net/ - I wrote a music quiz (http://webdeavour.appspot.com/) and used it to play clips of music when the user clicked the button for the question. Initially I had one player per question, and it was possible to play them ove...
Remove duplicates from an array of objects in JavaScript
...Index(obj => JSON.stringify(obj) === JSON.stringify(object))); jsfiddle.net/x9ku0p7L/28
– Eydrian
Jul 18 '18 at 11:33
12
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What is /dev/null 2>&1?
...te and write, and either appending to or writing to /dev/null has the same net effect. I usually just use > for that reason.)
2>&1 redirects standard error (2) to standard output (1), which then discards it as well since standard output has already been redirected.
...
Ruby off the rails
...side Windows applications (wxRuby GUI) and scripts, automating Excel, Internet Explorer, SQL Server queries and report generation (win32ole COM automation). I also use the sqlite, pdf-writer, and gruff libraries for various data munging and graph generation tasks.
Rails' success has been great for ...
How can I use MS Visual Studio for Android Development?
...
Yes you can:
http://www.gavpugh.com/2011/02/04/vs-android-developing-for-android-in-visual-studio/
In case you get "Unable to locate tools.jar. Expected to find it in C:\Program Files (x86)\Java\jre6\lib\tools.jar" you can add an environment ...
Manually map column names with class properties
... ORM that I just started using for a tiny project along with Npgsql on ASP.NET Core!
– victorvartan
Aug 11 '16 at 12:01
2
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