Summary of related issues that need to be paid attention to about values ​​and references

This article focuses on the difference between two different data types contained in JavaScript variables-basic type values ​​and reference type values. In addition, I briefly touched on the relationship between ECMAScript and JavaScript. The title is JavaScript variables, but more specifically it should be ECMAScript variables. In the 1990s, Netscape and Microsoft launched two different versions of JavaScript, which was not conducive to the development and use of JavaScript, prompting the European Computer Manufacturers Association (ECMA) to start dealing with the standardization issue of JavaScript. Thus completing the famous ECMA-262 - a standard that defines a new scripting language called ECMAScript. A complete JavaScript implementation includes ECMAScript, Document Object Model (DOM, Document Object Model), and Browser Object Model (BOM, Bro

1. Detailed explanation of issues related to JavaScript variables

Introduction: This article focuses on exploring the two different data types contained in JavaScript variables as well as the basic type values ​​and The difference between reference type values. In addition, the relationship between ECMAScript and JavaScript is briefly discussed

##2. A code example for understanding values ​​and references in JavaScript parameter passing

Introduction: Value and reference are common topics in various programming languages, and js does not Exception. I will analyze the actual running process of an example and share with you my understanding of values ​​and references in js parameter passing. Refer to the two classifications of official website data types. This article will refer to these two classifications as basic types (boolean, null, undefined, string, number, symbol) and object types. First, use an example to demonstrate the application of parameter passing: var obj = {}; obj..

##3.

A detailed introduction to the understanding of values ​​and references in JavaScript parameter passing

Introduction: value ) and reference are common topics in various programming languages, and js is no exception. I will analyze the actual running process of an example and share with you my understanding of the value and reference in js parameter passing. There are two classifications. This article refers to these two classifications as basic types (boolean, null, undefined, string, number, symbol) and object types. First, use an example to demonstrate the application of parameter passing: var obj = {}; obj. ..

##4.

photoshop cs5 official Chinese cracked version download PHP variable summary novice recommendation

Introduction: photoshop cs5 official Chinese cracked version download: photoshop cs5 official Chinese cracked version download PHP variable summary novice recommendation: There is no need to explicitly declare variables in PHP, variable declaration can be done at the same time as assignment. Good programming practice is: all variables should be done before use. Statement, preferably with comments. 1. Assignment of variables After a variable is declared, it can be assigned a value. There are two ways: value assignment and reference assignment. 1. Value assignment $color = "red" ; $sum = 12+"15" ; /* $sum = 27 */ 2. If you want two variables to point to the same copy of a value, you need to assign by reference. Reference assignment

5.

php assignment and reference assignment instructions_PHP tutorial

Introduction: php assignment and reference Instructions for assignment usage. Assignment in PHP is variable assignment and reference assignment. Now I will introduce to you some basic usage and differences. 1. Value assignment: Copy the value of the assignment expression to the variable.

6.

52, session storage

Introduction: PHP part 1. How many ways are there to configure a virtual host? Multiple sites can be run/maintained on one physical server. Users can access the site through different IPs or domain names. There are two ways to configure the virtual host: Configuration based on IP address (implemented by multiple network cards) Configure a virtual host based on the host name (multiple domain names mapped to one IP) 2. The life cycle of PHP scripts? 3. Direct value passing and reference passing of PHP variables Direct value passing:

7. The difference between the two ways of assigning PHP objects to variables, general assignment and reference assignment ?

## Introduction: class Person { public $name; protected $age; public function __construct($name, $age) { $this->name = $name; $ this->age = $age; }}$lh = new Person('Liu Hui', 23);$a = $lh;$b

8. php Instructions for use of assignment and reference assignment

Introduction: Assignment in PHP is variable assignment and reference assignment. Now I will introduce to you some basic usage and differences. . 1. Value assignment: Copy the value of the assignment expression to the variable. Example: The code is as follows Copy the code ...

9. Introduction to variable scope and super global variables in php

Introduction: 1. Assignment of variables You can assign values ​​to variables after they are declared. There are two ways: value assignment and reference assignment. 1. Value assignment $color = quot;redquot; ;$sum = 12+qu...

10. A brief analysis of Javascript variable functions_javascript skills

Introduction: Two types of values ​​can be stored in JavaScript variables: original values ​​and reference values. The original value is stored in a simple field on the stack, that is, the value is stored directly in the location marked by the variable.

[Related Q&A recommendations]:

javascript - Understand this in js, please correct if there are any errors

The above is the detailed content of Summary of related issues that need to be paid attention to about values ​​and references. For more information, please follow other related articles on the PHP Chinese website!