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...then
io.write("too young, too naive!\n")
else
local age = io.read()
print("Your age is "..age)
end
上面的语句不但展示了if-else语句，也展示了
1）“～=”是不等于，而不是!=
2）io库的分别从stdin和stdout读写的read和write函...
How to preview git-pull without doing fetch?
...ck to accept only the specific remote commits you want. Later, when you're ready to get everything, a git pull will merge in the rest of the commits.
Update: I'm not entirely sure why you want to avoid the use of git fetch. All git fetch does is update your local copy of the remote branches. This l...
Binary Data in MySQL [closed]
...lect_db("binary_data");
$data = mysql_real_escape_string(fread(fopen($form_data, "r"), filesize($form_data)));
$result = mysql_query("INSERT INTO binary_data (description, bin_data, filename, filesize, filetype) ".
"VALUES ('$form...
Why does Google prepend while(1); to their JSON responses?
...lled whenever an object (array or hash) attribute is set, allowing them to read the JSON content.
The while(1); or &&&BLAH&&& prevents this: an AJAX request at mail.google.com will have full access to the text content, and can strip it away. But a <script> tag insertio...
How to add/update an attribute to an HTML element using JavaScript?
...
You can read here about the behaviour of attributes in many different browsers, including IE.
element.setAttribute() should do the trick, even in IE. Did you try it? If it doesn't work, then maybe
element.attributeName = 'value' mig...
What is the difference between Serializable and Externalizable in Java?
...perform the marshalling and unmarshalling functions (you need to implement readExternal and writeExternal methods on your class). This gives you the means to get around the reflection performance bottleneck.
In recent versions of Java (1.3 onwards, certainly) the performance of reflection is vastl...
What is Haskell used for in the real world? [closed]
...er-to-value) or unboxed (value
directly) representation...
Safe multithreading! Immutable data structures are not subject to data race conditions, and consequently don't have to be protected by
locks. If you are always allocating new objects, rather than
destructively manipulating existing o...
What's the point of g++ -Wreorder?
...meone suggesting that something exist without even checking that it does already. web.archive.org/web/20070712184121/http://linux.die.net/man/1/…
– KymikoLoco
Jan 30 '17 at 19:29
...
Best way to reverse a string
...de characters, not bytes. Xor may be faster, but apart from being far less readable, that may even be what Array.Reverse() uses internally.
– Nick Johnson
Oct 23 '08 at 13:18
27
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What are Flask Blueprints, exactly?
I have read the official Flask documentation on Blueprints and even one or two blog posts on using them.
4 Answers
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