JS determines different resolutions and calls different CSS style files to implement ideas and test codes_javascript skills

I recently looked at a website and found that different monitor resolutions call style files differently. Today I wrote an example to study it,

Copy code The code is as follows:

Content in c1.css

Copy code The code is as follows:

*{ margin:0; padding:0;}
div{ width:960px; height:400px; margin :0 auto; background:blue; color:#ffffff;}

Content in c2.css

Copy the code The code is as follows:

*{ margin:0; padding:0;}
div{ width:1200px; height:400px; margin:0 auto; background:red; color:#fff;}