---
title: <string>
slug: Web/CSS/string
translation_of: Web/CSS/string
---
<div>{{CSSRef}}</div>

<div>在CSS中，<strong><code>&lt;string&gt;</code></strong> 是用来表示一串字符的数据类型，它被用在众多CSS属性中，例如{{cssxref("content")}}、{{cssxref("font-family")}}、和{{cssxref("quotes")}}。</div>

<h2 id="使用规则">使用规则</h2>

<p><strong><code>&lt;string&gt;</code></strong> 数据类型是由包含在英文双引号（<strong><code>"</code></strong>）或英文单引号（<font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);"><strong>'</strong></span></font>）中的任意数量的Unicode字符组成。</p>

<p>大多数字符都可以写成字面量的形式，并且所有字符都可以写成以反斜线（<code><strong>\</strong></code>）开头的十六进制Unicode码点的形式。比如说：<code><strong>\22</strong></code>表示一个双引号，<code><strong>\27</strong></code>表示一个单引号，<code><strong>\A9</strong></code>表示版权声明符号（<code><strong>©</strong></code>）。</p>

<p>需要注意的是，在使用某些特殊字符时需要在前面加上反斜线来转义，包括但不限于在双引号字符串中使用双引号字符，在单引号字符串中使用单引号字符，以及反斜线字符，比如<code><strong>\\</strong></code>表示一个反斜线字符。</p>

<p>当你想换行的时候，必须使用像<code><strong>\A</strong></code>或者<code><strong>\00000A</strong></code>这样的换行符。不过在你的代码中，可以通过在每行末尾增加一个反斜线（<code><strong>\</strong></code>）的方式来创建一个多行的字符串。</p>

<div class="note">
<p><strong>注意:</strong> CSS<code><strong>&lt;string&gt;</strong></code>中不能使用像<code><strong>&amp;nbsp;</strong></code>或者<code><strong>&amp;#8212;</strong></code>这样的实体。</p>
</div>

<h2 id="例子">例子</h2>

<pre>/* Simple strings */
"This string is demarkated by double quotes."
'This string is demarkated by single quotes.'

/* Character escaping */
"This is a string with \" an escaped double quote."
"This string also has \22 an escaped double quote."
'This is a string with \' an escaped single quote.'
'This string also has \27 an escaped single quote.'
"This is a string with \\ an escaped backslash."

/* New line in a string */
"This string has a \Aline break in it."

/* String spanning two lines of code (these two strings will have identical output) */
"A really long \
awesome string"
"A really long awesome string"
</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('CSS3 Values', '#strings', '&lt;string&gt;')}}</td>
   <td>{{Spec2('CSS3 Values')}}</td>
   <td>No significant change from CSS Level 2 (Revision 1).</td>
  </tr>
  <tr>
   <td>{{SpecName('CSS2.1', 'syndata.html#strings', '&lt;string&gt;')}}</td>
   <td>{{Spec2('CSS2.1')}}</td>
   <td>Explicit definition; allows 6-digit Unicode escaped characters.</td>
  </tr>
  <tr>
   <td>{{SpecName('CSS1', '', '&lt;string&gt;')}}</td>
   <td>{{Spec2('CSS1')}}</td>
   <td>Implicit definition; allows 4-digit Unicode escaped characters.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>1.0</td>
   <td>1.0 (1.0)</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>1.0 (85)</td>
  </tr>
  <tr>
   <td>\xx</td>
   <td>1.0</td>
   <td>1.0 (1.0)</td>
   <td>6.0</td>
   <td>{{compatVersionUnknown}}</td>
   <td>1.0 (85)</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Chrome for Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
  </tr>
  <tr>
   <td>\xx</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
   <td>{{compatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>