A brief analysis of how to introduce jQuery library files into HTML files

In web development, jQuery is a very commonly used JavaScript library, which can simplify JavaScript development and improve development efficiency. To use jQuery in a web page, you need to import the jQuery library file first. Next we will explain how to introduce jQuery library files into HTML files.

First method: Download the jQuery library file from the official website to your local computer

If you have downloaded the jQuery library file from the jQuery official website, follow the steps below.

1. Copy the downloaded (jQuery version number).js file to the js folder in the project folder.
2. Use the
   
   
   3. If you want to use the introduced jQuery library in the script of the web page, you need to use the $ symbol in the script. This requires adding another line of code to the script so that the $ symbol can Use jQuery library methods.

   Second method: Introduce jQuery library files through CDN

   In addition to downloading locally, you can also use CDN to introduce jQuery library files. This method allows users to free Use the jQuery library provided by CDN to speed up web page loading.

   1. Use the
      
      
      2. If you want to use the introduced jQuery library in the script of the web page, you need to use the $ symbol in the script. Unlike the first method, this method does not require $ symbol definition, because when loading the jQuery library file, CDN has defined the $ symbol as a jQuery global variable by default.

      Summary:

      The above is the way to introduce jQuery library files using two methods. You can choose the method according to your own needs. If you want to use the jQuery library file, you must import the library file, otherwise an error will be reported when using the jQuery method in the code.

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