大约有 30,000 项符合查询结果（耗时：0.0414秒） [XML]
Canvas width and height in HTML5
...st ctx = document.querySelector("#c").getContext("2d");
function render(time) {
time *= 0.001;
resizeCanvasToDisplaySize(ctx.canvas);
ctx.fillStyle = "#DDE";
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.save();
const spacing = 64;
const size = 48;
con...
Delete files older than 10 days using shell script in Unix [duplicate]
...
find is the common tool for this kind of task :
find ./my_dir -mtime +10 -type f -delete
EXPLANATIONS
./my_dir your directory (replace with your own)
-mtime +10 older than 10 days
-type f only files
-delete no surprise. Remove it to test your find filter before executing the whole com...
Regular expression to stop at first match
...ult, a quantified subpattern is "greedy", that is, it will
match as many times as possible (given a particular starting location)
while still allowing the rest of the pattern to match. If you want it
to match the minimum number of times possible, follow the quantifier
with a "?" . Note that ...
Downcasting in Java
...Downcasting is allowed when there is a possibility that it succeeds at run time:
Object o = getSomeObject(),
String s = (String) o; // this is allowed because o could reference a String
In some cases this will not succeed:
Object o = new Object();
String s = (String) o; // this will fail at runt...
Alternate output format for psql
... that selecting all columns causes a row of query results to wrap multiple times. Consequently, the output is hard to read.
...
How do I get the row count of a pandas DataFrame?
... len(df.index) takes 381 nanoseconds, or 0.381 microseconds, df.shape is 3 times slower, taking 1.17 microseconds. did I miss something? @root
– T.G.
May 22 '17 at 18:34
11
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The simplest possible JavaScript countdown timer? [closed]
Just wanted to ask how to create the simplest possible countdown timer.
3 Answers
3
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How to determine CPU and memory consumption from inside a process?
...ULL, &cpuQuery);
// You can also use L"\\Processor(*)\\% Processor Time" and get individual CPU values with PdhGetFormattedCounterArray()
PdhAddEnglishCounter(cpuQuery, L"\\Processor(_Total)\\% Processor Time", NULL, &cpuTotal);
PdhCollectQueryData(cpuQuery);
}
double getCurrent...
Legality of COW std::string implementation in C++11
...
-1 The logic doesn't hold water. At the time of a COW copying there are no references or iterators that can be invalidated, the whole point of doing the copying is that such references or iterators are now being obtained, so copying is necessary. But it may still b...
Scala best way of turning a Collection into a Map-by-key?
...n my machine for a list with 500,000 elements, this Scala code is about 20 times slower than the straight-forward Java approach (create HashMap with appropriate size, loop over list, put elements into map). For 5,000 elements, Scala ist about 8 times slower. The loop approach written in Scala is rou...