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---
title: CSSStyleDeclaration.getPropertyPriority()
slug: Web/API/CSSStyleDeclaration/getPropertyPriority
tags:
- API
- CSSDOM
- Method
- Reference
translation_of: Web/API/CSSStyleDeclaration/getPropertyPriority
---
<p>{{ APIRef("CSSOM") }}</p>
<p><strong>CSSStyleDeclaration.getPropertyPriority() </strong>方法会根据传入的CSS属性，返回一个 {{domxref('DOMString')}} 来表示该属性的优先级。</p>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox">var <em>priority</em> = <em>style</em>.getPropertyPriority(<em>property</em>);</pre>
<h3 id="参数">参数</h3>
<ul>
<li><em><code>property</code></em> 是一个{{domxref('DOMString')}}，表示要检查的属性名。</li>
</ul>
<h3 id="返回值">返回值</h3>
<ul>
<li><code><em>priority</em></code> 是一个{{domxref('DOMString')}}，用以表示属性优先级。存在，就返回（例如：<code>"important"</code>）；不存在，则返回空字符串。</li>
</ul>
<h2 id="例子">例子</h2>
<p>下面的代码检查了<code>margin</code>，在CSS规则中是否被设置为 important 优先级。</p>
<pre class="brush: js">var declaration = document.styleSheets[0].cssRules[0].style;
var isImportant = declaration.getPropertyPriority('margin') === 'important';
</pre>
<h2 id="标准">标准</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-getpropertypriority', 'CSSStyleDeclaration.getPropertyPriority()')}}</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>
<h2 id="浏览器兼容性"><strong>浏览器兼容性</strong></h2>
<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>
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