Introduction to two methods for Javascript to dynamically reference CSS files

This article mainly introduces two methods for loading CSS files in Javascript dynamically, which are frequently used and very practical. If you need a javascript dynamic insertion style, refer to the latest project, the previous method failed! The reason why I checked it for two hours was that I had my own bid. Let's talk about it later!

Javascript insert styles are widely used in front-end development, especially when you modify the front-end performance and page skin replacement. Recently, When you click a button on another website, a script is inserted and executed on another website page, which includes style insertion.

In general, there are two types of javascript dynamic insert styles. One is to introduce an external style to a pageUsed in Label introduces an external style file, and the other is to use