what purpose of scope resolution operator

See a few symbols about PHP today. One is @, this is added to the front of a variable, to suppress the PHP interpreter error, that is, even if the error is not displayed. There is also a more important symbol for PHP's range resolution operator (::)

JSIn the scope, we all know, divided into global scope and local scope, there is no block-level scope, it sounds very simple, but whether the scope can have a deep understanding of the JS code logic to write the success rate, BUG the ability to

The scope and context (contexts) in JavaScript are unique to the language, thanks in part to the flexibility they bring. Each function has a different context and scope of variables. These concepts are backed by some powerful design patterns in

The side effects of var are slightly different between implicit global variables and clearly defined global variables, that is, the ability to define variables through the delete operator. Global variables created through var (created in programs

C + + review Note One (declaration definition of a class applied and constructor destructor section)Const in C is "a variable that cannot be changed", whereas in C + + The seed is "a constant of type description", constants must be initialized and

Naming Conventions are necessary to enhance the readability of the Code, so that you can understand what you want to express at a Glance. Standards are rules that make the code easier for later maintenance, it can also greatly improve the

PHP5 Basic concepts of objects and classes Inherited from the most basic concepts, mainly for experienced object-oriented programmers and readers who have not yet touched the object.As a PHP programmer, you certainly know the variables and

Although, there is a certain C + + foundation (because the undergraduate has learned this kind, haha), but still decided to read the system of the book (before a few times before. Sweat).Leave it for your own reference later. (The content will be

Abstract class accelerator shortcut keys Accelerator Mapping Shortcut Mappings Accelerator table accelerator tables access modifier access modifier access Pack Package access specifier Access Descriptor access violation access violation

1.using: In order to avoid using namespaces every time, it is necessary to define a namespace by using the use of the content within the namespace for a specific area of the declaration using A::t;//using declaration Use it again to invoke the name