Web Front-end
JS Tutorial
What is the format of the switch statement? How to use switch statement
What is the format of the switch statement? How to use switch statement
In js, the switch statement is also a commonly used statement. The switch statement will be used to compare an expression with multiple values. But for many novices, they don’t know what the switch statement format is? How to use switch statement? Let’s summarize it below.
Switch statement format syntax:
switch(表达式)
{
case 取值1:
语块1;break;
}In the above code, we use the case statement to mark a position. The background will output the result according to the program switch condition until it jumps to the first matching result. Then the code program will be automatically executed, including other statements, and execution will not stop until the break function is encountered. [Recommended study: JavaScript Online Manual]
Of course, the default here is optional. When other case statements are not satisfied, the default statement will be executed. The code is as follows:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
var now = new Date(); //获取当天系统日期
var day = now.getDay(); //获取当天是星期几
var week;
switch(day)
{
case 1:
week = "星期一"; break;
case 2:
week = "星期二"; break;
case 3:
week = "星期三"; break;
case 4:
week = "星期四"; break;
case 5:
week = "星期五"; break;
case 6:
week = "星期六"; break;
default:
week = "星期日";
}
document.write("今天是"+week); //输出今天是星期几
</script>
</head>
<body>
</body>
</html>The display effect is as follows:
Analysis:
The use of other js loop statements was also introduced earlier, however In actual development, we have to decide whether to use if statements or switch according to the actual situation. We choose not to use if statements because they are often used, but switch is not often used, let alone because switch is more efficient.
Whether it is an if statement or other statements, as long as we grasp the core point, we try to use if for relatively few judgments. For many judgment statements, we still have to use switch statements.
The above is what is the format of the switch statement? A full introduction to how to use the switch statement. If you want to know more about JavaScript video tutorial, please pay attention to the php Chinese website.
The above is the detailed content of What is the format of the switch statement? How to use switch statement. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Replace String Characters in JavaScript
Mar 11, 2025 am 12:07 AM
Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi
Custom Google Search API Setup Tutorial
Mar 04, 2025 am 01:06 AM
This tutorial shows you how to integrate a custom Google Search API into your blog or website, offering a more refined search experience than standard WordPress theme search functions. It's surprisingly easy! You'll be able to restrict searches to y
Build Your Own AJAX Web Applications
Mar 09, 2025 am 12:11 AM
So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J
Example Colors JSON File
Mar 03, 2025 am 12:35 AM
This article series was rewritten in mid 2017 with up-to-date information and fresh examples. In this JSON example, we will look at how we can store simple values in a file using JSON format. Using the key-value pair notation, we can store any kind
8 Stunning jQuery Page Layout Plugins
Mar 06, 2025 am 12:48 AM
Leverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation
What is 'this' in JavaScript?
Mar 04, 2025 am 01:15 AM
Core points This in JavaScript usually refers to an object that "owns" the method, but it depends on how the function is called. When there is no current object, this refers to the global object. In a web browser, it is represented by window. When calling a function, this maintains the global object; but when calling an object constructor or any of its methods, this refers to an instance of the object. You can change the context of this using methods such as call(), apply(), and bind(). These methods call the function using the given this value and parameters. JavaScript is an excellent programming language. A few years ago, this sentence was
Improve Your jQuery Knowledge with the Source Viewer
Mar 05, 2025 am 12:54 AM
jQuery is a great JavaScript framework. However, as with any library, sometimes it’s necessary to get under the hood to discover what’s going on. Perhaps it’s because you’re tracing a bug or are just curious about how jQuery achieves a particular UI
10 Mobile Cheat Sheets for Mobile Development
Mar 05, 2025 am 12:43 AM
This post compiles helpful cheat sheets, reference guides, quick recipes, and code snippets for Android, Blackberry, and iPhone app development. No developer should be without them! Touch Gesture Reference Guide (PDF) A valuable resource for desig
