Two ways to dynamically load a script file _ javascript tips-js tutorial

The first method is ajax. The second method is to dynamically create a script tag, set its src attribute, and load js by inserting the script tag into the page head, interested friends can learn about the two methods to dynamically load scripts to pages.

The first method is to use ajax to load the script file code from the background to the foreground, and then run the code on the loaded content through eval. The second is to dynamically create a script tag, set its src attribute, and insert the script tag to the page head to load js, which is equivalent to writing