css - 字形 CSS 未加载

Question

我在浏览器控制台中收到错误::

glyphicons-halflings-regular.woff2:1 Failed to load resource: the server responded with a status of 404 (Not Found)
glyphicons-halflings-regular.woff:1 Failed to load resource: the server responded with a status of 404 (Not Found)
glyphicons-halflings-regular.ttf:1 Failed to load resource: the server responded with a status of 404 (Not Found)

当我检查元素时，我看到了::

::before == $0

这是什么意思？

检查元素中的 css 显示::

a[aria-expanded="false"]::before, a[aria-expanded="true"]::before {
    content: '\e259';
    display: block;
    position: absolute;
    right: 20px;
    font-family: 'Glyphicons Halflings';
    font-size: 0.6em;
}
a[aria-expanded="true"]::before {
    content: '\e260';
}

什么意思 content: '\e259'; ？

Answer 1

有没有导入Bootstrap？

确保您正确导入了 Bootstrap 。

https://getbootstrap.com/docs/4.3/getting-started/introduction/