Home Web Front-end JS Tutorial How to use the JavaScript Switch statement in action

How to use the JavaScript Switch statement in action

May 04, 2018 am 11:22 AM
javascript js switch

You will often encounter Switch statement when you start learning javascript. Here we will explain in detail the actual use of Switch statement.

Syntax

switch(n)
{
case 1:
  执行代码块 1
  break;
case 2:
  执行代码块 2
  break;
default:
  n 与 case 1 和 case 2 不同时执行的代码
}
Copy after login

How it works: First set the expression n (usually a variable). The value of the expression is then compared with the value of each case in the structure. If there is a match, the code block associated with the case is executed. Please use break to prevent the code from automatically running to the next case.

Example

Display today’s week name. Please note that Sunday=0, Monday=1, Tuesday=2, etc.: The result of

var day=new Date().getDay();
switch (day)
{
case 0:
  x="Today it's Sunday";
  break;
case 1:
  x="Today it's Monday";
  break;
case 2:
  x="Today it's Tuesday";
  break;
case 3:
  x="Today it's Wednesday";
  break;
case 4:
  x="Today it's Thursday";
  break;
case 5:
  x="Today it's Friday";
  break;
case 6:
  x="Today it's Saturday";
  break;
}
Copy after login

x:

Today it's Friday
Copy after login

default keyword

Please use the default keyword to Specifies what to do when a match does not exist:

Example

If today is not Saturday or Sunday, the default message will be output:

var day=new Date().getDay();
switch (day)
{
case 6:
  x="Today it's Saturday";
  break;
case 0:
  x="Today it's Sunday";
  break;default:
  x="Looking forward to the Weekend";}
Copy after login

x Result:

Looking forward to the Weekend
Copy after login

The switch statement is a sibling of the if statement. This section introduces the usage of switch statement and its difference from switch statement in Java.

For more knowledge about JavaScript Switch statement, please read the relevant content of php Chinese website:

Related recommendations:

Ajax PHP JavaScript MySQL implementation Simple no-refresh online chat room

The relationship between JavaScript calling mode and this keyword binding

In-depth understanding of JavaScript event mechanism

The above is the detailed content of How to use the JavaScript Switch statement in action. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Recommended: Excellent JS open source face detection and recognition project Recommended: Excellent JS open source face detection and recognition project Apr 03, 2024 am 11:55 AM

Face detection and recognition technology is already a relatively mature and widely used technology. Currently, the most widely used Internet application language is JS. Implementing face detection and recognition on the Web front-end has advantages and disadvantages compared to back-end face recognition. Advantages include reducing network interaction and real-time recognition, which greatly shortens user waiting time and improves user experience; disadvantages include: being limited by model size, the accuracy is also limited. How to use js to implement face detection on the web? In order to implement face recognition on the Web, you need to be familiar with related programming languages ​​and technologies, such as JavaScript, HTML, CSS, WebRTC, etc. At the same time, you also need to master relevant computer vision and artificial intelligence technologies. It is worth noting that due to the design of the Web side

Can Elden's Ring be played on switch? Can Elden's Ring be played on switch? Mar 11, 2024 am 11:31 AM

Can Elden's Ring be played on the switch? As a very charming action RPG game, many friends may not know whether it can be played smoothly on the switch platform. The answer is that it cannot be played at the moment. accomplish. Can Ring of Elden be played on switch? Answer: It cannot be played on switch. This highly anticipated Souls series role-playing action game has been officially released. Players can purchase it on PC, PS4/5 and Xbox Series eX|S/XboxOne and experience it immediately. Many friends who own a switch may still be eager to enjoy this game on the NS, but unfortunately, there is no switch version of the game. According to the official website configuration requirements, the game configuration is relatively high, and sw

Simple JavaScript Tutorial: How to Get HTTP Status Code Simple JavaScript Tutorial: How to Get HTTP Status Code Jan 05, 2024 pm 06:08 PM

JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest

The relationship between js and vue The relationship between js and vue Mar 11, 2024 pm 05:21 PM

The relationship between js and vue: 1. JS as the cornerstone of Web development; 2. The rise of Vue.js as a front-end framework; 3. The complementary relationship between JS and Vue; 4. The practical application of JS and Vue.

Is Switch2 compatible with Switch cartridges? Is Switch2 compatible with Switch cartridges? Jan 28, 2024 am 09:06 AM

Switch2 is a new model announced by Nintendo at Gamescom 2023. Some players are worried about whether there will be compatibility issues between the new model and the cartridges of previous versions. Let’s take a look. Is switch2 compatible with switch cassette? Answer: switch2 is not compatible with switch cassette. Introduction of Switch 2 cartridges According to information from Nintendo’s production chain company, Switch 2 may use 64GB cartridges. Because it has better performance and supports more 3A game masterpieces, it requires a larger cartridge capacity. Because many game works need to be castrated and compressed before they can be stuffed into a game cartridge. Moreover, Switch cartridges are prone to copying game content, so replace them with new cartridges.

js method to refresh current page js method to refresh current page Jan 24, 2024 pm 03:58 PM

js methods to refresh the current page: 1. location.reload(); 2. location.href; 3. location.assign(); 4. window.location. Detailed introduction: 1. location.reload(), use the location.reload() method to reload the current page; 2. location.href, you can refresh the current page by setting the location.href attribute, etc.

The difference between __proto__ and prototype in JS The difference between __proto__ and prototype in JS Feb 19, 2024 pm 01:38 PM

__proto__ and prototype are two attributes related to prototypes in JS. They have slightly different functions. This article will introduce and compare the differences between the two in detail, and provide corresponding code examples. First, let’s understand what they mean and what they are used for. proto__proto__ is a built-in property of an object that points to the prototype of the object. Every object has a __proto__ attribute, including custom objects, built-in objects, and function objects. By __proto__ genus

The AI ​​era of JS is here! The AI ​​era of JS is here! Apr 08, 2024 am 09:10 AM

Introduction to JS-Torch JS-Torch is a deep learning JavaScript library whose syntax is very similar to PyTorch. It contains a fully functional tensor object (can be used with tracked gradients), deep learning layers and functions, and an automatic differentiation engine. JS-Torch is suitable for deep learning research in JavaScript and provides many convenient tools and functions to accelerate deep learning development. Image PyTorch is an open source deep learning framework developed and maintained by Meta's research team. It provides a rich set of tools and libraries for building and training neural network models. PyTorch is designed to be simple, flexible and easy to use, and its dynamic computation graph features make

See all articles