大约有 12,000 项符合查询结果（耗时：0.0484秒） [XML]
querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...rs.
e.g. All list items descended from an element that is a member of the foo class: .foo li
document.querySelector("#view:_id1:inputText1") it doesn't work. But writing document.getElementById("view:_id1:inputText1") works. Any ideas why?
The : character has special meaning inside a selector...
LINQ OrderBy versus ThenBy
... will effectively be the dominant one. You can (in LINQ to Objects) write
foo.OrderBy(x).OrderBy(y).OrderBy(z)
which would be equivalent to
foo.OrderBy(z).ThenBy(y).ThenBy(x)
as the sort order is stable, but you absolutely shouldn't:
It's hard to read
It doesn't perform well (because it reor...
Best way of invoking getter by reflection
...import java.beans.*
for (PropertyDescriptor pd : Introspector.getBeanInfo(Foo.class).getPropertyDescriptors()) {
if (pd.getReadMethod() != null && !"class".equals(pd.getName()))
System.out.println(pd.getReadMethod().invoke(foo));
}
Note that you could create BeanInfo or PropertyDesc...
Create RegExps on the fly using string variables
...you can implement global string replacement with RegExp:
function replace_foo(target, string_to_replace, replacement) {
var relit= escapeRegExp(string_to_replace);
var sub= escapeSubstitute(replacement);
var re= new RegExp(relit, 'g');
return target.replace(re, sub);
}
What a pain...
How do I write a short literal in C++?
...n -Wconversion you still get a compiler diagnostic for the statement short foo = 1; foo += (short)2;. But this can't be circumvented due to the integer promotion.
– harper
Jan 27 '14 at 11:44
...
Diff output from two programs without temporary files
...swered Mar 26 '14 at 0:23
brokenfootbrokenfoot
9,06477 gold badges4343 silver badges6969 bronze badges
...
How can I read and parse CSV files in C++?
...tandard C++11 library. It copes well with Excel CSV quotation:
spam eggs,"foo,bar","""fizz buzz"""
1.23,4.567,-8.00E+09
The code is written as a finite-state machine and is consuming one character at a time. I think it's easier to reason about.
#include <istream>
#include <string>
#i...
Why can't I use the 'await' operator within the body of a lock statement?
...on:
// Now it's clear where the locks will be acquired and released
lock (foo)
{
}
var result = await something;
lock (foo)
{
}
So by prohibiting you from awaiting in the lock block itself, the language is forcing you to think about what you really want to do, and making that choice clearer in th...
What is tail recursion?
...ny
number as argument; it will never
overflow the stack:
function foo (n)
if n > 0 then return foo(n - 1) end
end
... As I said earlier, a tail call is a
kind of goto. As such, a quite useful
application of proper tail calls in
Lua is for programming state machines.
Such ...
c++11 Return value optimization or move? [duplicate]
...
Use exclusively the first method:
Foo f()
{
Foo result;
mangle(result);
return result;
}
This will already allow the use of the move constructor, if one is available. In fact, a local variable can bind to an rvalue reference in a return statement prec...