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App Inventor 2 DynamicComponents 拓展：动态创建AI2组件对象 · App Inventor 2 中文网
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JavaScript seconds to time string with format hh:mm:ss
I want to convert a duration of time, i.e., number of seconds to colon-separated time string (hh:mm:ss)
43 Answers
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Bash script to calculate time elapsed
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I find it very clean to use the internal variable "$SECONDS"
SECONDS=0 ; sleep 10 ; echo $SECONDS
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ggplot with 2 y axes on each side and different scales
...her, I scale of the first layer (i.e. the geom_bar ) is overlapped by the second layer (i.e. the geom_line ).
15 Answers
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Execution time of C program
...ed to be able to record the execution time (which could be anywhere from 1 second to several minutes). I have searched for answers, but they all seem to suggest using the clock() function, which then involves calculating the number of clocks the program took divided by the Clocks_per_second valu...
How to force the browser to reload cached CSS/JS files?
...ate suggestions from John Millikin and da5id. This solution is written in PHP, but should be easily adapted to other languages.
Update 2: Incorporating comments from Nick Johnson that the original .htaccess regex can cause problems with files like json-1.3.js. Solution is to only rewrite if there ...
Safe characters for friendly url [closed]
...ct is fairly straightforward: [...] params.toString() // "key=730d67"" (3) PHP Manual, http-build-query: "Generate URL-encoded query string. [...] The above example will output: 0=foo&1=bar[...]" (4) J. Starr, Perishable Press: "When building web pages, it is often necessary to add links that re...
Using module 'subprocess' with timeout
...nux) in the context of an Apache module (like mod_python, mod_perl, or mod_php), I've found the use of signals and alarms to be disallowed (presumably because they interfere with Apache's own IPC logic). So to achieve the goal of timing out a command I have been forced to write "parent loops" which ...
SQL query return data from multiple tables
...s (this stackOverflow answer is excellent to describe types of joins)
Intersect queries (and how to reproduce them if your database doesn't support them) - this is a function of SQL-Server (see info) and part of the reason I wrote this whole thing in the first place.
Part 2
Subqueries - what they...
How to use clock() in C++
...thm here */
duration = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;
std::cout<<"printf: "<< duration <<'\n';
}
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