Use jsdom and jquery to implement simple addition, deletion, modification, and jquery

Today I learned how to use the jquery framework. So we use it to implement simple addition, deletion, and modification, and then use the original javascript to implement the same function. The comparison between the two shows that jquery's powerful software development is actually the addition, deletion, modification, and query of data, javascript front-end development is no exception. Today I learned how to use the jquery framework. So we use it to implement simple addition, deletion, and modification, and then use the original javascript to implement the same function, so that we can see the strength of jquery:

The Code is as follows: