In Web development, Javascript is widely used in website form validation, animation effects, interactivity, etc. In order to enable Javascript, we need to link a JS file in the HTML. This article will explain how to link Javascript in HTML.
1. Embed Javascript
The most basic method is to embed Javascript code directly in the HTML page without linking to any files in the HTML document. As shown below:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>嵌入Javascript</title>
</head>
<body>
<script>
//在这里写Javascript代码
</script>
</body>
</html>The method of embedding Javascript code is suitable for very simple functional requirements, which is the fastest way across platforms.
2. External link Javascript files
When the amount of Javascript code gradually increases, we need to write the code in a separate .js file, and then link the .js file in HTML. Load the entire Javascript program. We can create a new .js file, copy and paste the Javascript code into the file, and then link the file in the HTML page. As shown below:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>外链Javascript</title>
</head>
<body>
<script src="helloworld.js"></script>
</body>
</html>The "src" attribute specifies the path to link to the external Javascript file. In the above example, the file name is "helloworld.js". Note that the file path needs to be specified relative to the location of the HTML file.
3. Link to external CDN library
Under normal circumstances, we can obtain the Javascript library from the CDN (content distribution network) to reduce the load on the server and obtain faster web page loading speed. For example, libraries like jQuery and Bootstrap are available from Google and Bootstrap CDN. Using a CDN often requires changing the link path in your code to the CDN's link. As shown below:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>链接CDN库</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<!-- 在这里调用jQuery代码 -->
</body>
</html>In the above example, we used jQuery’s CDN link. Please note that when using a CDN, you should choose to report a relatively stable CDN address and use an https link to ensure website security.
This article introduces various ways to link Javascript in HTML: embedding Javascript, externally linking Javascript files, and linking to external CDN libraries. The first two methods are suitable for small projects, while external CDN libraries are suitable for large projects with high reliability and speed. In actual web development, we can choose an appropriate method for Javascript linking based on the actual situation, needs and security of the project.
The above is the detailed content of How to link javascript in html. For more information, please follow other related articles on the PHP Chinese website!
HTML and React's Integration: A Practical GuideApr 21, 2025 am 12:16 AMHTML and React can be seamlessly integrated through JSX to build an efficient user interface. 1) Embed HTML elements using JSX, 2) Optimize rendering performance using virtual DOM, 3) Manage and render HTML structures through componentization. This integration method is not only intuitive, but also improves application performance.
React and HTML: Rendering Data and Handling EventsApr 20, 2025 am 12:21 AMReact efficiently renders data through state and props, and handles user events through the synthesis event system. 1) Use useState to manage state, such as the counter example. 2) Event processing is implemented by adding functions in JSX, such as button clicks. 3) The key attribute is required to render the list, such as the TodoList component. 4) For form processing, useState and e.preventDefault(), such as Form components.
The Backend Connection: How React Interacts with ServersApr 20, 2025 am 12:19 AMReact interacts with the server through HTTP requests to obtain, send, update and delete data. 1) User operation triggers events, 2) Initiate HTTP requests, 3) Process server responses, 4) Update component status and re-render.
React: Focusing on the User Interface (Frontend)Apr 20, 2025 am 12:18 AMReact is a JavaScript library for building user interfaces that improves efficiency through component development and virtual DOM. 1. Components and JSX: Use JSX syntax to define components to enhance code intuitiveness and quality. 2. Virtual DOM and Rendering: Optimize rendering performance through virtual DOM and diff algorithms. 3. State management and Hooks: Hooks such as useState and useEffect simplify state management and side effects handling. 4. Example of usage: From basic forms to advanced global state management, use the ContextAPI. 5. Common errors and debugging: Avoid improper state management and component update problems, and use ReactDevTools to debug. 6. Performance optimization and optimality
React's Role: Frontend or Backend? Clarifying the DistinctionApr 20, 2025 am 12:15 AMReactisafrontendlibrary,focusedonbuildinguserinterfaces.ItmanagesUIstateandupdatesefficientlyusingavirtualDOM,andinteractswithbackendservicesviaAPIsfordatahandling,butdoesnotprocessorstoredataitself.
React in the HTML: Building Interactive User InterfacesApr 20, 2025 am 12:05 AMReact can be embedded in HTML to enhance or completely rewrite traditional HTML pages. 1) The basic steps to using React include adding a root div in HTML and rendering the React component via ReactDOM.render(). 2) More advanced applications include using useState to manage state and implement complex UI interactions such as counters and to-do lists. 3) Optimization and best practices include code segmentation, lazy loading and using React.memo and useMemo to improve performance. Through these methods, developers can leverage the power of React to build dynamic and responsive user interfaces.
React: The Foundation for Modern Frontend DevelopmentApr 19, 2025 am 12:23 AMReact is a JavaScript library for building modern front-end applications. 1. It uses componentized and virtual DOM to optimize performance. 2. Components use JSX to define, state and attributes to manage data. 3. Hooks simplify life cycle management. 4. Use ContextAPI to manage global status. 5. Common errors require debugging status updates and life cycles. 6. Optimization techniques include Memoization, code splitting and virtual scrolling.
The Future of React: Trends and Innovations in Web DevelopmentApr 19, 2025 am 12:22 AMReact's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.
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
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
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),
Atom editor mac version download
The most popular open source editor
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
Zend Studio 13.0.1
Powerful PHP integrated development environment
