大约有 47,000 项符合查询结果（耗时：0.0589秒） [XML]
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...ame = (user && user.address && user.address.street) || "Unknown Street";
share
|
improve this answer
|
follow
|
...
Get a pixel from HTML Canvas?
...
Pixel manipulation section is now available here : w3.org/TR/2dcontext2/#pixel-manipulation
– jtraulle
Mar 13 '19 at 11:01
add a c...
Convert javascript array to string
...day','Monday','Tuesday','Wednesday','Thursday']
array = A + ""
That's it Now A is a string. :)
share
|
improve this answer
|
follow
|
...
vs.
...al URLS, not sure if the other examples work with dataURLS (please let me know if the other examples work with dataURLS?)
<iframe class="page-icon preview-pane" frameborder="0" height="352" width="396" src="data:application/pdf;base64, ..DATAURLHERE!... "></iframe>
...
How can I update my ADT in Eclipse?
...king try the same *Go to eclipse > help > Install new software * but now please do the follwing:
Click on add
Add this url : https://dl-ssl.google.com/android/eclipse/
Give it any name.
It will list the updates available- which should ideally be adt 20.xx
Eclipse will restart and hopeful...
In Python, using argparse, allow only positive integers
... case, you can also use the choices parameter if your upper limit is also known:
parser.add_argument('foo', type=int, choices=xrange(5, 10))
Note: Use range instead of xrange for python 3.x
share
|
...
How to split data into training/testing sets using sample function
...eed(101) # Set Seed so that same sample can be reproduced in future also
# Now Selecting 75% of data as sample from total 'n' rows of the data
sample <- sample.int(n = nrow(data), size = floor(.75*nrow(data)), replace = F)
train <- data[sample, ]
test <- data[-sample, ]
By using caTool...
How to get a random number in Ruby
...
@yar: It is a bit "perlish". Now Ruby has it's Random class (see my answer)
– Marc-André Lafortune
May 5 '10 at 14:02
...
Converting string to numeric [duplicate]
... even after deleting the text, you still have a factor in your dataframe.
Now regarding the conversion, there's a more optimal way to do so. So I put it here as a reference :
> x <- factor(sample(4:8,10,replace=T))
> x
[1] 6 4 8 6 7 6 8 5 8 4
Levels: 4 5 6 7 8
> as.numeric(levels(x))[...
How to apply multiple styles in WPF
...der the heading "How can I set multiple styles in WPF?"
That blog is dead now, so I'm reproducing the post here
WPF and Silverlight both offer the ability to derive a Style from another Style through the “BasedOn” property. This feature enables developers to organize their styles using a hi...