在网格系统中使用空divs

Question

我使用的是1140网格系统，并且有一个基本问题：如果要使元素的宽度小于12列，是否需要将空div用作“间隔符”？

这里是我期待实现样机：

基本上，我想页脚只是下方的主要区域，但在其自己的行。我能看到做到这一点的唯一方法是使用div作为“spacer”将页脚缩进到我想要的位置。这是如何完成的？

下面的代码（你需要使预览屏幕大，看这是怎么回事）：http://jsfiddle.net/saltcod/87DZC/

<link rel="stylesheet" href="https://raw.github.com/robertcedwards/HTML-5-Boilerplate-1140-Grid/master/css/1140.css" type="text/css" media="screen" /> 

<div id="main"> 
<h1 class="site-title">Site Title</h1> 
    <div class="container"> 
     <div class="row"> 
      <div id="sidebar" class="threecol"> 
       <h4> Sidebar - Three cols</h4> 
       <ul> 
        <li> Item one</li> 
        <li> Item two</li> 
        <li> Item three</li> 
        <li> Item four</li> 
        <li> Item five</li> 
      </div> 
      <div id="primary" class="ninecol last"> 
       <h3>Nine columns</h3> 
       <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse vel lectus non nisi pellentesque porta sed vel ante. Aliquam ut elit nulla, ac fermentum diam. Donec convallis dui in felis bibendum mollis. Quisque egestas purus libero, ac vehicula tortor. Sed tristique est sed libero pulvinar nec luctus metus vulputate. Etiam ac tempor nunc. Morbi sit amet neque lacus, ac lacinia nisl. Nullam imperdiet ornare sem, non viverra ipsum hendrerit id. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Cras vel leo nisl. Ut bibendum ornare urna eget lacinia.</p> 

       <p>Aliquam ante lectus, ornare a sollicitudin tincidunt, convallis a magna. Sed fermentum lacus id nisl vestibulum interdum. Ut mattis justo in mi vulputate porttitor. Proin sagittis, urna quis blandit semper, velit nisi aliquet dui, et placerat leo purus a erat. Donec congue, elit a eleifend facilisis, lectus sapien placerat augue, in feugiat ante purus sodales libero. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean eget lacus sed enim euismod faucibus. Pellentesque facilisis arcu sed leo gravida a ultricies nisi cursus. Quisque venenatis mollis ligula sed semper. Nullam ac sem purus, non tincidunt velit. In hendrerit, odio sit amet tempus pharetra, libero orci suscipit tellus, eu mollis augue dui a nulla. Vivamus dignissim elit sit amet est mollis sed aliquet lorem posuere. Nulla varius purus quis elit pellentesque et auctor nunc gravida. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Sed nibh erat, aliquet a luctus vel, pulvinar nec neque.</p> 

       <h2> If I want three blocks inside #primary, that's easy: </h2> 
       <div class="fourcol bottom">A</div> 
       <div class="fourcol bottom">B</div> 
       <div class="fourcol bottom last">C</div> 

     </div> <!-- [ .row ] --> 

     <footer class="row twelvecol"> 
      <h3> But if I want three blocks in my footer, I need to 'indent' it with an empty div?</h3> 
      <div class="threecol empty bottom"> [ empty div ]</div> 
      <div class="threecol bottom">A</div> 
      <div class="threecol bottom">B</div> 
      <div class="threecol bottom last">C</div> 
      <p> Isn't this a bit like using a spacer gif in a table layout? </p> 
     </footer> 
    </div> 
</div> 

Answer 1

这是不是有点像一个表格布局使用间隔GIF ？

是的，基本上div会创建你想要的空间。在使用CSS网格框架时，通常使用具有相应列类的空白div来相应地分隔空间。当然你可以想出涉及相对定位等的替代解决方案，但为什么会使问题复杂化。最后一段代码应该看起来像这样。

<footer class="row twelvecol"> 
     <div class="threecol first"></div>   
     <div class="threecol bottom">A</div> 
     <div class="threecol bottom">B</div> 
     <div class="threecol bottom last">C</div> 
    </footer>