CSS不是脚本，因此您不必从脚本执行的意义上执行"它.

CSS is not a script, so you dont have to "execute" it in the sense of script execution.

基本上，动态创建的<link>标签并附加到标头应该足够，例如

Basically a <link> tag created on the fly and appended to the header should suffice, like

$('<link/>', {
   rel: 'stylesheet',
   type: 'text/css',
   href: 'path_to_the.css'
}).appendTo('head');

或

var linkElem = document.createElement('link');
document.getElementsByTagName('head')[0].appendChild(linkElem);
linkElem.rel = 'stylesheet';
linkElem.type = 'text/css';
linkElem.href = 'path_to_the.css';

如果要在不使用jQuery的情况下进行操作.

if you want to do it without jQuery.

浏览器将响应DOM中的更改并相应地更新页面布局.

The browser will respond to the change in the DOM and update your page layout accordingly.

编辑:

我已经阅读到旧的Internet Explorer遇到了麻烦，您可能需要像回答中那样使其工作:

I have read that old Internet Explorer has trouble with this, and you might need to do it like in answer to make it work:

https://***.com/a/2685639/618206

EDIT2 :

读取文件内容并将其内联(在<style>标记之间)也是一种有效的解决方案，但是那样CSS不会被浏览器缓存.

Reading the file content and putting it inline (between <style> tags) is also a valid solution, but that way the CSS will not be cached by the browser.