我用几行javascript解决了这个问题。

$('a.menu_item').each(function() {
    let width = $(this).width();
    $(this).css('width',width + 'px');
});

我用几行javascript解决了这个问题。

$('a.menu_item').each(function() {
    let width = $(this).width();
    $(this).css('width',width + 'px');
});

Seeing a lot of great but very involved answers here. There's really not a need for resetting widths, adding hidden elements, reworking elements for different layout declarations, etc. The simplest solution is just to account for the increase in size from the bold text by adjusting the font size in the hover declaration to a slightly smaller size. Like for example font-size: .985em from the normal 1em declaration, which allows the text to bold when hovered but also maintain the original size appearance.

如果您不能设置宽度，那么这意味着宽度将随着文本变得粗体而改变。除了修改每个状态的填充/边距之类的妥协，没有办法避免这种情况。

另一种方法是通过文本阴影“模拟”粗体文本。这有一个额外的好处(/malus，取决于你的情况)，也适用于字体图标。

   nav li a:hover {
      text-decoration: none;
      text-shadow: 0 0 1px; /* "bold" */
   }

有点俗气，尽管它可以避免重复文本(如果文本很多，这很有用，就像我的情况一样)。

试试这个:

.nav {
  font-family: monospace;
}