How to introduce jquery.js

jquery.js is introduced in this way, what do you think?

In modern front-end development, using the jQuery library is a very common choice. However, using jQuery also requires the correct import of the library files to ensure that it works properly. In this article, we will explore some best practices and tips to ensure that the jQuery library is introduced correctly and elegantly.

1. Introduction using CDN

CDN (Content Delivery Network) is a technology that can provide high-speed access to materials on the network. It is very popular in modern front-end development because it makes websites load faster. At the same time, CDNs usually have free versions, which can reduce the burden of network transmission and repositories.

jQuery’s CDN address can be obtained on the official website. Not only that, now commonly used JavaScript libraries (Bootstrap, React, etc.) have CDN addresses available, which are also very convenient to use.

2. Introducing local files

So, what if you can’t use a CDN? Sometimes, project development may be in a closed network environment, in which case a local jQuery file is necessary.

In this case, you can use a relative or absolute path to reference the jQuery file. However, to ensure security, it is best to conduct a brief review of jQuery's source files before introduction to ensure the integrity and security of the files.

3. Use ES6 modules to import

Another option is to use ES6 modules (supported by Atom 1.10, Chrome 61, Firefox 60, and Edge 16). This is because modern browsers have built-in ES6 module system, and files can be imported through the import keyword.

This requires using the ES6 version of jQuery. The ES6 version of jQuery is not included in the official release, but has been provided in npm. You can install it with the following command: npm i jquery@3.5.0-es (note that the version number must be consistent with the version number when downloaded from the official website).

In addition, there are many benefits of using ES6 modules, such as Tree-Shaking, etc.

Summary

In modern front-end development, the use of jQuery is very common. When introducing the jQuery library, CDN introduction, local file introduction and ES6 module introduction are all feasible options. In order to ensure the security of the code, it is best to conduct a brief review of the source files before introduction. At the same time, it is recommended to adopt best practices when introducing them to ensure code integrity and modularity.

The above is the detailed content of How to introduce jquery.js. For more information, please follow other related articles on the PHP Chinese website!