大约有 47,000 项符合查询结果（耗时：0.0617秒） [XML]
add column to mysql table if it does not exist
My research and experiments haven't yielded an answer yet, so I am hoping for some help.
16 Answers
...
Creating a JavaScript cookie on a domain and reading it across sub domains
...
Just set the domain and path attributes on your cookie, like:
<script type="text/javascript">
var cookieName = 'HelloWorld';
var cookieValue = 'HelloWorld';
var myDate = new Date();
myDate.setMonth(myDate.getMonth() + 12);
document.cookie...
Why does GitHub recommend HTTPS over SSH?
... HTTPS because it is the easiest to set up on the widest range of networks and platforms, and by users who are new to all this.
There is no inherent flaw in SSH (if there was they would disable it) -- in the links below, you will see that they still provide details about SSH connections too:
HTTP...
Select random lines from a file
In a Bash script, I want to pick out N random lines from input file and output to another file.
4 Answers
...
How can I parse a time string containing milliseconds in it with python?
... Thanks docs.python.org/library/datetime.html : New in version 2.6: time and datetime objects support a %f format code which expands to the number of microseconds in the object, zero-padded on the left to six places.
– ilkinulas
Mar 30 '09 at 18:01
...
Need a good hex editor for Linux [closed]
I need a good HEX editor for Linux, and by good I mean:
4 Answers
4
...
Reintegrate can only be used if revisions X through Y were previously merged from to reintegra
...
If you are working on a branch and have been keeping it up to date with others work you might be bemused when you create a working copy of the trunk and attempt to reintegrate your branch if you get a message something like this:
$ svn merge --reintegrate...
Count number of rows within each group
I have a dataframe and I would like to count the number of rows within each group. I reguarly use the aggregate function to sum data as follows:
...
How do I conditionally apply CSS styles in AngularJS?
...ange dynamically. Think programmable control of the style values.
ng-show and ng-hide - use if you only need to show or hide something (modifies CSS)
ng-if - new in version 1.1.5, use instead of the more verbose ng-switch if you only need to check for a single condition (modifies DOM)
ng-switch - u...
What XML parser should I use in C++? [closed]
I have XML documents that I need to parse and/or I need to build XML documents and write them to text (either files or memory). Since the C++ standard library does not have a library for this, what should I use?
...