大约有 44,800 项符合查询结果（耗时：0.0623秒） [XML]
Is JavaScript a pass-by-reference or pass-by-value language?
...
32 Answers
32
Active
...
Make copy of an array
I have an array a which is constantly being updated. Let's say a = [1,2,3,4,5] . I need to make an exact duplicate copy of a and call it b . If a were to change to [6,7,8,9,10] , b should still be [1,2,3,4,5] . What is the best way to do this? I tried a for loop like:
...
Is it possible to modify variable in python that is in outer, but not global, scope?
... think this does what you want, but I'm not sure if you are running python 2 or 3.
The nonlocal statement causes the listed identifiers to refer to
previously bound variables in the nearest enclosing scope. This is
important because the default behavior for binding is to search the
local n...
How to get the focused element with jQuery?
...
752
// Get the focused element:
var $focused = $(':focus');
// No jQuery:
var focused = document.ac...
XPath query to get nth instance of an element
...
2 Answers
2
Active
...
Using Java to find substring of a bigger string using Regular Expression
...
12 Answers
12
Active
...
Current executing procedure name
... OBJECT_NAME(@@PROCID)
Update: This command is still valid on SQL Server 2016.
share
|
improve this answer
|
follow
|
...
Package cairo was not found in the pkg-config search path. Node j.s install canvas issue
...emex's link helped me troubleshoot it.
... You need to install libcairo2-dev, libjpeg-dev and libgif-dev packages ...
sudo apt-get install libcairo2-dev libjpeg-dev libgif-dev
share
|
improve...
Moving matplotlib legend outside of the axis makes it cutoff by the figure box
...plotlib.pyplot as plt
import numpy as np
plt.gcf().clear()
x = np.arange(-2*np.pi, 2*np.pi, 0.1)
fig = plt.figure(1)
ax = fig.add_subplot(111)
ax.plot(x, np.sin(x), label='Sine')
ax.plot(x, np.cos(x), label='Cosine')
ax.plot(x, np.arctan(x), label='Inverse tan')
handles, labels = ax.get_legend_hand...
Command not found error in Bash variable assignment
...
When you write:
STR = "foo"
bash tries to run a command named STR with 2 arguments (the strings '=' and 'foo')
When you write:
STR =foo
bash tries to run a command named STR with 1 argument (the string '=foo')
When you write:
STR= foo
bash tries to run the command foo with STR set to the...