The correct way to introduce jQuery library files

How to correctly introduce jQuery library files

In the process of web development, jQuery is a very commonly used JavaScript library, which simplifies DOM operations, event processing, and animation Effects and other operations help developers complete page interaction effects more efficiently. Correctly introducing jQuery library files is the first step to start using jQuery. The following will introduce in detail how to correctly introduce jQuery library files, with specific code examples.

1. Download jQuery library file
   First, you need to download the latest version of jQuery library file from jQuery’s official website (https://jquery.com/). Generally speaking, you can choose to download a minified version of the jQuery file, which can reduce the file size and speed up page loading.
2. Save the jQuery file to the project directory
   After the download is completed, save the jQuery library file to your project directory. It is usually recommended to place the jQuery file in a separate folder, such as in the project Create a folder named "js" in the root directory and save the jQuery file in it.
3. Introduce jQuery files into HTML documents
   In your HTML document, you need to introduce jQuery library files to start using its functions. You can introduce jQuery files in the following two ways:

Method 1: Import through CDN
A common way is to introduce jQuery files directly through CDN (content distribution network), which can speed up Files load and reduce server stress. The specific code is as follows:

<script src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.min.js"></script>

Method 2: Import the jQuery file locally
If you want to download the jQuery file locally for import, you can use the following code example:

<script src="js/jquery.min.js"></script>

4. Test whether jQuery has been successfully introduced
   In order to verify whether jQuery has been successfully introduced, you can write a simple jQuery code in the HTML document, such as outputting a pop-up box. The specific code is as follows:

   
   
   
   
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.min.js"></script>
   
   
   
    点击测试
   
    <script>
        $(document).ready(function () {
            $("#test-btn").click(function () {
                alert("jQuery引入成功！");
            });
        });
    </script>
   
   
   

5. Notes
   When introducing jQuery library files, you need to pay attention to the following points:
6. When introducing other plug-ins or libraries that need to use jQuery, Make sure the jQuery files are included before the required plugins.
7. Make sure the jQuery file path is correct to avoid 404 errors.
8. Use compressed versions of jQuery files as much as possible to reduce file size.
9. Update jQuery files to the latest version in a timely manner to ensure the use of the latest features and fix possible security vulnerabilities.

Summary
By correctly introducing jQuery library files, you can easily use the rich functions provided by jQuery in web development, improve user experience and speed up development. I hope the introduction methods and code examples provided in this article are helpful to you, and I wish you success in the development process!

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