大约有 3,300 项符合查询结果（耗时：0.0116秒） [XML]
What does `void 0` mean? [duplicate]
...ne argument and always returns undefined.
Examples
void 0
void (0)
void "hello"
void (new Date())
//all will return undefined
What's the point of that?
It seems pretty useless, doesn't it? If it always returns undefined, what's wrong with just using undefined itself?
In a perfect world we woul...
In Swift how to call method with parameters on GCD main thread?
...
Swift 3+ & Swift 4 version:
DispatchQueue.main.async {
print("Hello")
}
Swift 3 and Xcode 9.2:
dispatch_async_on_main_queue {
print("Hello")
}
share
|
improve this answer
...
multiple definition of template specialization when using different objects
... but the original object itself is defined only in one file - in this case hello.h.
– Justin Liang
Apr 8 '15 at 17:02
3
...
Why are C# 3.0 object initializer constructor parentheses optional?
...
var b = new[] { 1, 1.5, 2, 2.5 }; // double[]
var c = new[] { "hello", null, "world" }; // string[]
var d = new[] { 1, "one", 2, "two" }; // Error
Reference: http://msdn.microsoft.com/en-us/library/ms364047%28VS.80%29.aspx
...
New line in JavaScript alert box
...r like \n \t etc... in js alert box
for exemple in php script:
$string = 'Hello everybody \n this is an alert box';
echo "<script>alert(\"$string\")</script>";
But a second possible problem arrives when you want to display a string specified in double quoted.
see link text
If the s...
Bash set +x without it being printed
..._STATUS=$? ; set +x; } 2>/dev/null; (exit $PREV_STATUS)'
trace_on
echo hello
trace_off
echo "status: $?"
trace_on
(exit 56)
trace_off
When executed:
$ ./test.sh
+ echo hello
hello
status: 0
+ exit 56
status: 56
sh...
How to calculate UILabel width based on text length?
...
Swift 4 Answer who are using Constraint
label.text = "Hello World"
var rect: CGRect = label.frame //get frame of label
rect.size = (label.text?.size(attributes: [NSFontAttributeName: UIFont(name: label.font.fontName , size: label.font.pointSize)!]))! //Calculate as per label fo...
A proper wrapper for console.log with correct line number?
...g = true //global debug state
debug = Debugger(isDebug, this)
debug.log('Hello log!')
debug.trace('Hello trace!')
Now you can add it to your classes:
var MyClass = function() {
this.isDebug = true //local state
this.debug = Debugger(isDebug, this)
this.debug.warn('It works in classses')
}...
Why should eval be avoided in Bash, and what should I use instead?
...
@anishsane: For your Suppose, x="echo hello world"; Then to execute whatever is contained in x, we can use eval $x However, $($x) is wrong, isn't it? Yes: $($x) is wrong because it runs echo hello world and then tries to run the captured output (at least in the ...
Search for string and get count in vi editor
...nding and counting in particular range of line number 1 to 10:
:1,10s/hello//gn
Please note, % for whole file is repleaced by , separated line numbers.
For finding and replacing in particular range of line number 1 to 10:
:1,10s/helo/hello/gn
...