大约有 45,000 项符合查询结果（耗时：0.0715秒） [XML]
How to check if a query string value is present via JavaScript?
How can I check if the query string contains a q= in it using JavaScript or jQuery?
10 Answers
...
Appending a line to a file only if it does not already exist
...;> foo.bar
-q be quiet
-x match the whole line
-F pattern is a plain string
https://linux.die.net/man/1/grep
Edit:
incorporated @cerin and @thijs-wouters suggestions.
share
|
improve this an...
Does Swift have access modifiers?
... types of "private" and "fileprivate":
class A {
private var aPrivate: String?
fileprivate var aFileprivate: String?
func accessMySelf() {
// this works fine
self.aPrivate = ""
self.aFileprivate = ""
}
}
// Declaring "B" for checking the abiltiy of accessing...
Prefer composition over inheritance?
...f OO design (inheritance, polymorphism, encapsulation).
class Person {
String Title;
String Name;
Int Age
}
class Employee : Person {
Int Salary;
String Title;
}
This is inheritance at work. The Employee "is a" Person or inherits from Person. All inheritance relationships are "is-...
Xcode 4 and Core Data: How to enable SQL Debugging
... Any way to print this -com.apple.CoreData.MigrationDebug 1 on string file, so that user can upload the log file
– rhlnair
Aug 22 '14 at 10:42
add a comment
...
Sass calculate percent minus px
... values are in variables, you may need to use interpolation turn them into strings (otherwise Sass just tries to perform arithmetic):
$a: 25%;
$b: 5px;
.foo {
width: calc(#{$a} - #{$b});
}
share
|
...
Understanding events and event handlers in C#
...is delegate can be used to point to methods
//which return void and take a string.
public delegate void MyEventHandler(string foo);
//This event can cause any method which conforms
//to MyEventHandler to be called.
public event MyEventHandler SomethingHappened;
//Here is some code I want to be exe...
Is there a “null coalescing” operator in JavaScript?
... coalescing operator (??) is using a logical OR (||):
var whatIWant = someString || "Cookies!";
There are cases (clarified below) that the behaviour won't match that of C#, but this is the general, terse way of assigning default/alternative values in JavaScript.
Clarification
Regardless of th...
How to find out client ID of component for ajax update/render? Cannot find component with expression
... following code is inspired from PrimeFaces DataGrid + DataTable Tutorials and put into a <p:tab> of a <p:tabView> residing in a <p:layoutUnit> of a <p:layout> . Here is the inner part of the code (starting from p:tab component); the outer part is trivial.
...
How to replace a single word under cursor?
...like vim interprets / and . as end of the word and won't select the entire string.
– Alexander Cska
May 1 at 21:47
...