在CSS中使用代码

p {
  white-space: pre-line;
}

使用这种CSS, P标签内的每个输入都将是HTML中的一个断行。

也许有人会有和我一样的问题:

我在一个带有display: flex的元素中，所以我必须使用flex-direction: column。

有关链接列表

其他答案根据具体情况提供了一些添加换行符的好方法。但是需要注意的是:after选择器对于CSS控制链接列表(以及类似的东西)来说是一种更好的方法，原因如下。

下面是一个例子，假设有一个目录:

<style type="text/css">
    .toc a:after{ content: "\a"; white-space: pre; }
</style>

<span class="toc">
    <a href="#a1">Item A1</a> <a href="#a2">Item A2</a>
    <a href="#b1">Item B1</a> <a href="#b2">Item B2</a>
</span>

这是Simon_Weaver的技术，它更简单，更兼容。它没有将风格和内容分开，需要更多的代码，并且可能在某些情况下您希望在事后添加中断。不过这仍然是一个很好的解决方案，尤其是对于老版本的IE。

<style type="text/css">
    .toc br{ display: none; } /* comment out for horizontal links */
</style>

<span class="toc">
    <a href="#a1">Item A1</a><br/> <a href="#a2">Item A2</a><br/>
    <a href="#b1">Item B1</a><br/> <a href="#b2">Item B2</a><br/>
</span>

注意以上解决方案的优点:

No matter the whitespace in the HTML, the output is the same (vs. pre) No extra padding is added to the elements (see NickG's display:block comments) You can easily switch between horizontal and vertical lists of links with some shared CSS without going into every HTML file for a style change No float or clear styles affecting surrounding content The style is separate from the content (vs. <br/>, or pre with hard-coded breaks) This can also work for loose links using a.toc:after and <a class="toc"> You can add multiple breaks and even prefix/suffix text

设置一个br标记来显示:none是有帮助的，但是你可以用WordsRunTogether结束。我发现用空格字符代替它更有帮助，就像这样:

HTML:

<h1>
    Breaking<br />News:<br />BR<br />Considered<br />Harmful!
</h1>

CSS:

@media (min-device-width: 1281px){
    h1 br {content: ' ';}
    h1 br:after {content: ' ';}
}

如果这能帮助到某人…

你可以这样做:

<p>This is an <a class="on-new-line">inline link</a>?</p>

用这个css:

a.on-new-line:before { 
  content: ' '; 
  font-size:0; 
  display:block;
  line-height:0;
}

要使元素在后面有换行符，为它赋值:

显示:块;

块级元素之后的非浮动元素将在下一行出现。许多元素，如<p>和<div>已经是块级元素，所以您可以只使用它们。

But while this is good to know, this really depends more on the context of your content. In your example, you would not want to use CSS to force a line break. The <br /> is appropriate because semantically the p tag is the the most appropriate for the text you are displaying. More markup just to hang CSS off it is unnecessary. Technically it's not exactly a paragraph, but there is no <greeting> tag, so use what you have. Describing your content well with HTMl is way more important - after you have that then figure out how to make it look pretty.