Exercises for simple additions and deletions using DOM elements and jquery elements

software development is actually the data deletion and modification, JavaScript front-end development is no exception. Today I learned the simple use of the jquery framework. Then use it to achieve simple additions and deletions, and then also use the original JavaScript to achieve the same function, in order to see the power of jquery:

The code is as follows:

<! DOCTYPE html>
Exercises for simple additions and deletions using DOM elements and jquery elements