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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...之。
关于QR Code Specification，可参看这个PDF：http://raidenii.net/files/datasheets/misc/qr_code.pdf
基础知识
首先，我们先说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸...
Npm install failed with “cannot run in wd”
...e provides a very clear step-by-step instruction of how to do so:
https://www.digitalocean.com/community/tutorials/how-to-install-an-upstream-version-of-node-js-on-ubuntu-12-04
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How do you detect Credit card type based on number?
... }
return sel_brand;
}
Here you can play with it:
http://jsfiddle.net/upN3L/69/
For PHP use this function, this detects some sub VISA/MC cards too:
/**
* Obtain a brand constant from a PAN
*
* @param string $pan Credit card number
* @param bool $include_sub_types I...
Resize image in PHP
...imon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software...
What is the difference between Int and Integer?
...t least the range [ - 2^29,
2^29 - 1].
from the Haskell report: http://www.haskell.org/onlinereport/basic.html#numbers
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How do I create a link using javascript?
...
<script language="javascript">
<!--
document.write("<a href=\"www.example.com\">");
document.write("Your Title");
document.write("</a>");
//-->
</script>
OR
<script type="text/javascript">
document.write('Your Title'.link('http://www.example.com'));
</scrip...
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?
...d unfortunately the links are broken due to migration of SwingLabs to java.net) technical reasons are for instance mentioned in the Rules (hehe) or in the link @bendicott found in his/her comment to my answer. Socially, posing tons of work onto your unfortunate fellow who has to maintain the code an...
How do I uninstall a package installed using npm link?
... reinstall from your package.json:
npm unlink redis
npm install
https://www.tachyonstemplates.com/npm-cheat-sheet/#unlinking-a-npm-package-from-an-application
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...
mongoDB/mongoose: unique if not null
...cumentation with respect to Unique Indexes and Missing Keys here at http://www.mongodb.org/display/DOCS/Indexes#Indexes-UniqueIndexes.
// NOTE: Code to executed in mongo console.
db.things.ensureIndex({firstname: 1}, {unique: true});
db.things.save({lastname: "Smith"});
// Next operation ...
Deploy a project using Git push
...s-files -z | rsync --files-from - --copy-links -av0 . user@server.com:/var/www/project
you might have to delete files which got removed from the project.
this copies all the checked in files. rsync uses ssh which is installed on a server anyways.
the less software you have installed on a server ...