How to use js to load css files and cache these loaded css

I am currently loading it in this way, but this cannot be cached to the browser.

$("head"). Append ($(" < link rel= "stylesheet" type= "text/css" / >")

.attr("href", `aaa.css?1525440977`) );
Mar.22,2021

try ? 1525440977 .


the dynamically loaded data should be cached by setting the server to return 304, right?

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