大约有 41,400 项符合查询结果（耗时：0.0140秒） [XML]
The smallest difference between 2 Angles
...targetA - sourceA
a = (a + 180) % 360 - 180
Beware in many languages the modulo operation returns a value with the same sign as the dividend (like C, C++, C#, JavaScript, full list here). This requires a custom mod function like so:
mod = (a, n) -> a - floor(a/n) * n
Or so:
mod = (a, n) -&g...
How to list all methods for an object in Ruby?
...
Module#instance_methods
Returns an array containing the names of the public and protected instance methods in the receiver. For a module, these are the public and protected methods; for a class, they are the instance (not...
How to succinctly write a formula with many variables from a data frame?
...
d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also do things like this, to use all variables but one (in this case x3 is excluded):
mod <- lm(y ~ . - x3, data = d)
Technically, . means all variables not already mentioned in t...
Python: reload component Y imported with 'from X import Y'?
In Python, once I have imported a module X in an interpreter session using import X , and the module changes on the outside, I can reload the module with reload(X) . The changes then become available in my interpreter session.
...
CodeIgniter removing index.php from url
... this file
index.php
Step:-3 Write below code in .htaccess file
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>
Step:-4 In some case the default setting for uri_protoco...
.htaccess not working apache
... that AllowOverride is set correctly. See http://httpd.apache.org/docs/2.4/mod/core.html#allowoverride for details. You need to also ensure that it is set in the correct scope - ie, in the right block in your configuration. Be sure you're NOT editing the one in the block, for example.
Third, if y...
~x + ~y == ~(x + y) is always false?
...
Assume for the sake of contradiction that there exists some x and some y (mod 2n) such that
~(x+y) == ~x + ~y
By two's complement*, we know that,
-x == ~x + 1
<==> -1 == ~x + x
Noting this result, we have,
~(x+y) == ~x + ~y
<==> ~(x+y) + (x+y) == ~x + ~y + (x+y)
<...
What are WSGI and CGI in plain English?
...er on web server start, either as part of the web server process (embedded mode) or as a separate process (daemon mode), and loads the script into it. Each request results in a specific function in the script being called, with the request environment passed as arguments to the function.
CGI runs t...
Create subdomains on the fly with .htaccess (PHP)
...se it power an application as the question proposes.
I have documented my mod_rewrite based mass virtual hosting environment before in a post on my blog, which you could look at if that is the route you wish to take. There is also, of course, the respective Apache manual page.
Apache also has an i...
What is “export default” in javascript?
...
It's part of the ES6 module system, described here. There is a helpful example in that documentation, also:
If a module defines a default export:
export default function() { console.log("hello!") }
then you can import that default expo...