大约有 6,261 项符合查询结果（耗时：0.0240秒） [XML]
How does the “this” keyword work?
...is
Simple function invocation
Consider the following function:
function foo() {
console.log("bar");
console.log(this);
}
foo(); // calling the function
Note that we are running this in the normal mode, i.e. strict mode is not used.
When running in a browser, the value of this would be ...
Double Negation in C++
...ompiler warning. Try this:
int _tmain(int argc, _TCHAR* argv[])
{
int foo = 5;
bool bar = foo;
bool baz = !!foo;
return 0;
}
The 'bar' line generates a "forcing value to bool 'true' or 'false' (performance warning)" on MSVC++, but the 'baz' line sneaks through fine.
...
How to add/update an attribute to an HTML element using JavaScript?
...nnerHTML slop, I would treat it like one and stick with the e.className = 'fooClass' and e.id = 'fooID'. This is a design preference, but in this instance trying to treat is as anything other than an object works against you.
It will never backfire on you like the other methods might, just be awar...
How to use range-based for() loop with std::map?
... called structured bindings, which allows for the following:
std::map< foo, bar > testing = { /*...blah...*/ };
for ( const auto& [ k, v ] : testing )
{
std::cout << k << "=" << v << "\n";
}
...
Release generating .pdb files, why?
... you can force it to load by specifying the /i option like this .reload /i foo.dll. That will load foo.pdb even if foo.pdb was created after releasing foo.dll.
– Marc Sherman
Nov 29 '12 at 14:20
...
JavaScript plus sign in front of function expression
... functions that are invoked immediately, e.g.:
+function() { console.log("Foo!"); }();
Without the + there, if the parser is in a state where it's expecting a statement (which can be an expression or several non-expression statements), the word function looks like the beginning of a function decl...
What's the point of g++ -Wreorder?
...
This can bite you if your initializers have side effects. Consider:
int foo() {
puts("foo");
return 1;
}
int bar() {
puts("bar");
return 2;
}
struct baz {
int x, y;
baz() : y(foo()), x(bar()) {}
};
The above will print "bar" then "foo", even though intuitively one woul...
Tuples( or arrays ) as Dictionary keys in C#
...ht reference comarison...try: bool test = new Tuple<int, string>(1, "foo").Equals(new Tuple<int, string>(1, "Foo".ToLower()));
– Mike Marynowski
Aug 5 '13 at 5:09
...
Get fully qualified class name of an object in Python
...
With the following program
#! /usr/bin/env python
import foo
def fullname(o):
# o.__module__ + "." + o.__class__.__qualname__ is an example in
# this context of H.L. Mencken's "neat, plausible, and wrong."
# Python makes no guarantees as to whether the __module__ special
#...
Can I find events bound on an element with jQuery?
...is an internal-use only method:
// Bind up a couple of event handlers
$("#foo").on({
click: function(){ alert("Hello") },
mouseout: function(){ alert("World") }
});
// Lookup events for this particular Element
$._data( $("#foo")[0], "events" );
The result from $._data will be an object t...