Is the relationship between express and node the same as js and JQ?
JS is a language that can be run on the browser side or the server side.
jQueryJS is an encapsulation library in browser environment, which encapsulates DOM operations, ajax, etc. into a compatible and convenient method.
nodeJS is a non-browser operating platform, which provides API for web server development, just like servlet in Java
expressIt is the framework for web server development in node and encapsulates some API of node on the web, a bit like the encapsulation of servlet by various MVC frameworks in Java.
There are similarities between the two. express and jQuery both encapsulate their own platforms (node, DOM API)
The two are different in their functional categories. Express development server, jquery to do browser-side operations