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Reconnection of Client when server reboots in WebSocket
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When the server reboots, the Web Socket connection is closed, so the JavaScript onclose event is triggered. Here's an example that tries to reconnect every five seconds.
function start(websocketServerLocation){
ws = new WebSocket(websocketServerLocation);
ws.onmessage = function(evt) { al...
关于我们 · App Inventor 2 中文网，少儿编程陪伴者
... var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?8d287b854d737bdc880e8ddeac1b309d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })();
Adding git branch on the Bash command prompt
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git 1.9.3 or later: use __git_ps1
Git provides a shell script called git-prompt.sh, which includes a function __git_ps1 that
prints text to add to bash PS1 prompt (includes branch name)
Its most basic usage is:
$ __git_ps1
(master)
It also takes an optional format string...
How to detect the current OS from Gradle
...and Os.FAMILY_UNIX on MacOS. Usually it is not something you need in build scripts.
There is though another way to achieve this using Gradle 2+ API, namely:
import org.gradle.internal.os.OperatingSystem;
task detect {
doLast {
println(OperatingSystem.current().isMacOsX())
printl...
Google Maps API v3: How to remove all markers?
...details on the topic: https://developers.google.com/maps/documentation/javascript/markers#remove
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List of foreign keys and the tables they reference
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Here is an all-purpose script we use that has been incredibly handy.
Save it off so you can execute it directly (@fkeys.sql). It will let you search by Owner and either the Parent or Child table and show foreign key relationships. The current ...
Is there a REAL performance difference between INT and VARCHAR primary keys?
...) ENGINE=InnoDB;
Then, I filled 10 million rows in each table with a PHP script whose essence is like this:
$pdo = get_pdo();
$keys = [ 'alabam', 'massac', 'newyor', 'newham', 'delawa', 'califo', 'nevada', 'texas_', 'florid', 'ohio__' ];
for ($k = 0; $k < 10; $k++) {
for ($j = 0; $j <...
Debugging iframes with Chrome developer tools
...main frame can. You can still set breakpoints in and debug your code using Scripts panel though.
Update: This is no longer true. See Metagrapher's answer.
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Fastest exit strategy for a Panic Button in Crisis/Abuse Websites? [closed]
...s almost instant. You don't have to worry about reload/servers because the scripts should already be loaded and ready to go. If you keep the same look and feel it looks like the user was just navigating to a different page of the website. Don't make it too obvious from the look of your website that ...
Remove folder and its contents from git/GitHub's history
...y using filter-branch directly can lead to issues.
Most of the multi-line scripts above to remove dir from the history could be re-written as:
git filter-repo --path dir --invert-paths
The tool is more powerful than just that, apparently. You can apply filters by author, email, refname and more...