大约有 7,000 项符合查询结果（耗时：0.0225秒） [XML]
What is the difference between syntax and semantics in programming languages?
...t does the sentence mean? For example:
x++; // increment
foo(xyz, --b, &qrs); // call foo
are syntactically valid C statements. But what do they mean? Is it even valid to attempt to transform these statements into an executable sequence of instructions? These questions are a...
Creating and Update Laravel Eloquent
...user = User::firstOrNew(array('name' => Input::get('name')));
$user->foo = Input::get('foo');
$user->save();
Below is the updated link of the docs which is on the latest version of Laravel
Docs here: Updated link
...
How to capture no file for fs.readFileSync()?
... / catch block:
var fileContents;
try {
fileContents = fs.readFileSync('foo.bar');
} catch (err) {
// Here you get the error when the file was not found,
// but you also get any other error
}
Unfortunately you can not detect which error has been thrown just by looking at its prototype chain...
Why does ASP.NET webforms need the Runat=“Server” attribute?
...o, since ASP.NET is designed to
allow separation of the web designers
(foo.aspx) from the web developers
(foo.aspx.vb), the web designers can
use their own web designer tools to
place HTML and client-side JavaScript
without having to know about ASP.NET
specific tags or attributes.
...
How do you exit from a void function in C++?
...
You mean like this?
void foo ( int i ) {
if ( i < 0 ) return; // do nothing
// do something
}
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Why can't radio buttons be “readonly”?
...value merely by disabling the other options:
<input type="radio" name="foo" value="Y" checked>
<input type="radio" name="foo" value="N" disabled>
Fiddle: http://jsfiddle.net/qqVGu/
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Is there a standard function to check for null, undefined, or blank variables in JavaScript?
...lared) you should check with the typeof operator. For instance
if( typeof foo !== 'undefined' ) {
// foo could get resolved and it's defined
}
If you can be sure that a variable is declared at least, you should directly check if it has a truthy value like shown above.
Further read: http://ty...
What's the best way of scraping data from a website? [closed]
...same requests yourself. So you might pull the html from http://example.com/foobar and extract one piece of data and then have to pull the json response from http://example.com/api/baz?foo=b... to get the other piece of data. You'll need to be aware of passing the correct cookies or session parameter...
String literals: Where do they go?
...ndent on your platform and could change over time), just use arrays:
char foo[] = "...";
The compiler will arrange for the array to get initialized from the literal and you can modify the array.
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Is there a way to @Autowire a bean that requires constructor arguments?
...ts BeanService{
@Autowired
public MybeanService(MyConstructorClass foo){
// do something with foo
}
}
@Component
public class MyConstructorClass{
public MyConstructorClass(@Value("#{some expression here}") String value){
// do something with value
}
}
Update: i...