我理解你的问题。这可以通过将 display:table 放在父 div 上并将 display:table-cell 放在导航栏中的所有 lis 上来实现。然后所有的行为都会像 teable-cells 并根据提供的空间占用宽度。阅读我的文章：http ://www.aurigait.com/blog/how-to-make-navigation-bar-stretch-across-the-page/
或者查看以下结构，例如：
<nav class="main-menu">
<ul>
<li><a href="#" title="link1">Small Link</a></li>
<li><a href="#" title="link2">Another Link</a></li>
<li><a href="#" title="link3">One Another Link</a></li>
<li class="sp-width"><a href="#" title="link4">A long link with 40% of total width</a></li>
</ul>
</nav>
和 CSS
ul, li{ list-style:none; margin:0; padding:0;}/*1.1*/
.main-menu ul{background-color:black;} /*1.2*/
.main-menu a{color:white; display:block; padding:5px; text-decoration:none;} /*1.2, 1.3*/
.main-menu a:hover{background -color:#333333; text-decoration:none; color:white;}/*1.2*/
.main-menu > ul{ display:table; width:100%;} /*2.1, 2.2*/
.main-menu > ul > li{ display:table-cell; border-right:1px solid #d4d4d4;} /*3.1, 3.2 */
.main-menu > ul > li:last-child{ border-right:none;}/*3.2*/
.main-menu > ul > li > a{ text-align:center;}/*2*/
.sp-width{ width:40%;}
现在让我们在其中再添加 3 个链接，因此 HTML 结构现在将：
<nav class="main-menu">
<ul>
<li><a href="#" title="link1">Small Link</a></li>
<li><a href="#" title="link2">Another Link</a></li>
<li><a href="#" title="link3">One Another Link</a></li>
<li><a href="#" title="link">Another Link</a></li>
<li><a href="#" title="link">Another Link</a></li>
<li><a href="#" title="link">Another Link</a></li>
<li class="sp-width"><a href="#" title="link4">A long link with 40% of total width</a></li>
</ul>
</nav>
所以 CSS 改变了：
.main-menu > ul > li{ display:table-cell; border-right:1px solid #d4d4d4; width:10%;} /*4*/
.sp-width{ width:40%!important;} /*5*/
需要注意的点：
1.1. Global Definition
1.2. Global Definition for Main menu all uls and links. (In case of Sub-menu it will be applied on that sub-menu also)
1.3. Using display:block, so it will cover entire area of li and whole li will be click-able.
2.
2.1. I am using ‘>’(Direct Child) here so if we define any sub-menu inside, this CSS will not work on that.
2.2. ‘Width’ property is necessary with ‘display:table’. Because default width of display:table is ‘Auto’ means as per the inside content.
3.
3.1.Display:table-cell, divides the total width / remaining width(the un-divided width. In our case it is 100%-40%=60%) equally. It always need display:table on its parent container.
3.2. I am using border-right for showing links separately and removing extra border on last-child in the next line.
4. How width is distributed, if we define it explicitly:
4.1. If width is more than the average width(100% / No. of links) then it will give that width to first link and then from remaining if possible then to second link and then rest to other link and if no width left then to rest of the links as per content (with text wrapping as default) and remaining width in proportion as we provided. Example: we have 4 links and we define 50% width for each. So it will assign 3rd and 4th link as per the content and to 2nd and 1st link remaining width’s 50 %.
4.2. If width is less than the average width, it will distribute the width equally in all links.
4.3. If one link is having some specific width and we want all other links with a particular width (Our Case), It will provide the given width to that link(s) and then remaining width will be divided equally to all links including the specific width link.
5. We provide ‘!important’ here because of ‘order of precedence’. The hierarchical definitions have more weight than the class definitions. And ‘!important’ provides supreme power to class definition so it will be applied. I will discuss on Order of Precedence in my later blog.