---
title: CSSStyleDeclaration.item()
slug: Web/API/CSSStyleDeclaration/item
translation_of: Web/API/CSSStyleDeclaration/item
---
<p>{{ APIRef("CSSOM") }}</p>

<p id="Summary"><span class="seoSummary"><code>CSSStyleDeclaration.item()</code> 通过下标从 {{domxref('CSSStyleDeclaration')}} 返回一个 CSS 属性值</span>。只要传入参数这个方法就不会抛出异常； 当传入的下标越界时会返回空字符串，当未传入参数时会抛出一个 <code>TypeError</code> 。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var <em>propertyName</em> = <em>style</em>.item(<em>index</em>);
</pre>

<h3 id="参数">参数</h3>

<ul>
 <li><em><code>index</code></em> 是需要查找节点的索引，索引下标从零开始。</li>
</ul>

<h3 id="Return_value">Return value</h3>

<ul>
 <li><em><code>propertyName</code></em> 是一个 {{domxref('DOMString')}} ，是在特定索引位置下的属性的名称。</li>
</ul>

<p>使用以下的 javascript 语法可以通过索引从 style 的节点列表中获取对应值：</p>

<pre class="syntaxbox">var propertyName = style[index];
</pre>

<h2 id="范例">范例</h2>

<pre class="brush: js">var style = document.getElementById('div1').style;
var propertyName = style.item(1); // or simply style[1] - returns the second style listed</pre>

<h2 id="规范">规范</h2>

<table>
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('CSSOM', '#dom-cssstyledeclaration-item', 'CSSStyleDeclaration.item()')}}</td>
   <td>{{Spec2('CSSOM')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('DOM2 Style', 'css.html#CSS-CSSStyleDeclaration', 'CSSStyleDeclaration')}}</td>
   <td>{{Spec2('DOM2 Style')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<p><strong>浏览器兼容性</strong></p>

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

<div id="compat-desktop">
<table class="compat-table">
 <thead>
  <tr>
   <th scope="col">Feature</th>
   <th scope="col">Chrome</th>
   <th scope="col">Edge</th>
   <th scope="col">Firefox (Gecko)</th>
   <th scope="col">Internet Explorer</th>
   <th scope="col">Opera</th>
   <th scope="col">Safari (WebKit)</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

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