Web Front-endJS TutorialDetailed explanation of JavaScript modification of css local and global style codeDetailed explanation of JavaScript modification of css local and global style code
Modifying css style style is quite practical in some cases. You can dynamically change some styles. Next, I will introduce how to do it using JavaScript
1. Partially change the style
There are three types: changing direct style, changing className and changing cssText. What needs to be noted is:
Pay attention to capitalization:
Javascript is very sensitive to capitalization. ClassName cannot write "N" as "n", and cssText cannot write "T" as "t", otherwise it cannot be implemented. Effect.
Calling method:
If you change className, declare the class in the style sheet in advance, but do not follow style when calling, like document.getElementById('obj').style.className=”…” Incorrect! It can only be written as: document.getElementById('obj').className="..."
Change cssText
But if you use cssText, you must add style. The correct way to write it is: document.getElementById('obj') .style.cssText=”…”
I don’t need to talk about changing the direct style. Remember to write the specific style, such as
document.getElementById('obj').style.backgroundColor=”#003366″
2. Globally change the style
Usually In this case, we can achieve real-time switching of web page styles by changing the href value of the external link style, that is, "changing the template style". At this time, we first need to give an id to the target that needs to be changed, such as
<link rel = "stylesheet" type="text/css" id="css" href="firefox.css" />
. It is very simple to call, such as
<span on click="javascript:document.getElementById('css').href = 'ie.css'">点我改变样式</span>
. Newcomers often do not know that the specific CSS style is in javascript. How to write it, and sometimes the requirements are different in different browsers. For example, float is written as styleFloat in IE and cssFloat in FIREFOX, which requires everyone's accumulation. Searching "ccvita javascript" in Google may help your doubts.
Basic knowledge
There are usually three ways to call style sheets in web pages.
First method: Linking to an external style sheet file (Linking to a Style Sheet)
You can create an external style sheet file (.css) first, and then use the HTML link object. An example is as follows:
<head> <title>文档标题</title> <link rel=stylesheet href="http://demo.css" type="text/css"> </link></head>
In XML, you should add it in the declaration area as shown in the following example:
< ? xml-stylesheet type="text/css" href="http://dhtmlet.css" ?>
Second: Define an internal style block object (Embedding a Style Block)
You can insert a
block object between the and tags in your HTML document. For definition methods, please refer to style sheet syntax. An example is as follows:
<html>
<head>
<title>文档标题</title>
<style type="text/css">
<!--
body {font: 10pt "Arial"}
h1 {font: 15pt/17pt "Arial"; font-weight: bold; color: maroon}
h2 {font: 13pt/15pt "Arial"; font-weight: bold; color: blue}
p {font: 10pt/12pt "Arial"; color: black}
-->
</style>
</head>
<body>
</body></html> Please note that setting the type attribute of the style object to "text/css" here allows browsers that do not support this type to ignore the style sheet.
Third type: Inline Definition (Inline Styles)
Inline definition is to use the object's style attribute within the object's tag to define the style sheet attributes that apply to it. Examples are as follows:
<p style="margin-left: 0.5in; margin-right:0.5in">这一行被增加了左右的外补丁</p><p> </p>
The above is the detailed content of Detailed explanation of JavaScript modification of css local and global style code. For more information, please follow other related articles on the PHP Chinese website!
From Websites to Apps: The Diverse Applications of JavaScriptApr 22, 2025 am 12:02 AMJavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.
Python vs. JavaScript: Use Cases and Applications ComparedApr 21, 2025 am 12:01 AMPython is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.
The Role of C/C in JavaScript Interpreters and CompilersApr 20, 2025 am 12:01 AMC and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.
JavaScript in Action: Real-World Examples and ProjectsApr 19, 2025 am 12:13 AMJavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.
JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AMThe main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AMUnderstanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AMPython is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AMPython and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Atom editor mac version download
The most popular open source editor
SublimeText3 Linux new version
SublimeText3 Linux latest version
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
Zend Studio 13.0.1
Powerful PHP integrated development environment
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
