Two ways to dynamically load JavaScript files _ javascript tips-js tutorial

The first method is ajax. The second method is to create a script tag and configure its src attribute. After the script tag is pulled out to the page head to load js, for more information about how to dynamically load JavaScript files, see this article.
The first method is to use ajax to load the script file code from the background to the foreground, and then implement the code for the loaded content through eval. The second is to create a script tag and configure its src attribute. After inserting the script tag into the page head to load js, it is equivalent to writing