大约有 45,000 项符合查询结果（耗时：0.0483秒） [XML]
Node.js app can't run on port 80 even though there's no other process blocking the port
... Not sure why, but on Ubuntu 14.04 this did not work for me. I now use port forwarding via ssh, which is just as easy. I posted an answer below.
– panepeter
Feb 27 '18 at 9:12
...
How do I set a variable to the output of a command in Bash?
...myDate '2000-01-01'
946681200
myDate "$(ps ho lstart 1)" boottime
myDate now now ; read utm idl </proc/uptime
myBc "$now-$boottime" uptime
printf "%s\n" ${utm%%.*} $uptime
42134906
42134906
ps --tty pts/20 fw
PID TTY STAT TIME COMMAND
29019 pts/20 Ss 0:00 bash
30944 pt...
Why do people say there is modulo bias when using a random number generator?
...t defined in cstdlib (see this article for a general overview on rand()).
Now what happens if you want to generate a random number between say 0 and 2? For the sake of explanation, let's say RAND_MAX is 10 and I decide to generate a random number between 0 and 2 by calling rand()%3. However, rand()...
What is an example of the simplest possible Socket.io example?
... <script src="cdn.socket.io/socket.io-1.2.1.js"></script> and now it works
– Alexander Mills
Dec 31 '14 at 7:12
...
Xcode 5.1 - No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=i
...east works for me). Below is a screenshot for it:
EDIT:
As far as I know (please point it out if there's something wrong, thanks), if you set ONLY_ACTIVE_ARCH to YES, it means the Xcode will only build for the active architecture (which refers to the device that's active in Xcode currently). S...
Retrieve the position (X,Y) of an HTML element relative to the browser window
I want to know how to get the X and Y position of HTML elements such as img and div in JavaScript relative to the browser window.
...
How to set Java environment path in Ubuntu
... java
java: /usr/bin/java /usr/share/java /usr/share/man/man1/java.1.gz
Now dig deeper-
$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 46 Aug 25 2018 /etc/alternatives/java -> /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Dig deeper:
$ ls -l /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
...
Accessing dict keys like an attribute?
...usion about what's being done, since this isn't a commonly-used idiom. I know it would have the potential to confuse me.
Additonally, if you change the value of KEY as follows (but miss changing d.spam), you now get:
>>> KEY = 'foo'
>>> d[KEY] = 1
>>> # Several lines of...
Weird PHP error: 'Can't use function return value in write context'
...
Phew, thx man! Now, if the parser would say "I expected square brackets after an array variable's name, duh!", it would sound much cooler than "Can't use function return value in write context." I might submit that to the PHP guys as a sugg...
How to use filter, map, and reduce in Python 3
...s from the documentation.
Views And Iterators Instead Of Lists
Some well-known APIs no longer return lists:
[...]
map() and filter() return iterators. If you really need a list, a quick fix is e.g. list(map(...)), but a better fix is often to use a list comprehension (especially when the original ...