How to link javascript in html
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!
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
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
1386
52
How do you connect React components to the Redux store using connect()?
Mar 21, 2025 pm 06:23 PM
Article discusses connecting React components to Redux store using connect(), explaining mapStateToProps, mapDispatchToProps, and performance impacts.
React's Role in HTML: Enhancing User Experience
Apr 09, 2025 am 12:11 AM
React combines JSX and HTML to improve user experience. 1) JSX embeds HTML to make development more intuitive. 2) The virtual DOM mechanism optimizes performance and reduces DOM operations. 3) Component-based management UI to improve maintainability. 4) State management and event processing enhance interactivity.
How do you define routes using the <Route> component?
Mar 21, 2025 am 11:47 AM
The article discusses defining routes in React Router using the <Route> component, covering props like path, component, render, children, exact, and nested routing.
What are the limitations of Vue 2's reactivity system with regard to array and object changes?
Mar 25, 2025 pm 02:07 PM
Vue 2's reactivity system struggles with direct array index setting, length modification, and object property addition/deletion. Developers can use Vue's mutation methods and Vue.set() to ensure reactivity.
What are Redux reducers? How do they update the state?
Mar 21, 2025 pm 06:21 PM
Redux reducers are pure functions that update the application's state based on actions, ensuring predictability and immutability.
What are the benefits of using TypeScript with React?
Mar 27, 2025 pm 05:43 PM
TypeScript enhances React development by providing type safety, improving code quality, and offering better IDE support, thus reducing errors and improving maintainability.
What are Redux actions? How do you dispatch them?
Mar 21, 2025 pm 06:21 PM
The article discusses Redux actions, their structure, and dispatching methods, including asynchronous actions using Redux Thunk. It emphasizes best practices for managing action types to maintain scalable and maintainable applications.
How can you use useReducer for complex state management?
Mar 26, 2025 pm 06:29 PM
The article explains using useReducer for complex state management in React, detailing its benefits over useState and how to integrate it with useEffect for side effects.
