files/zh-cn/web/http/headers/feature-policy/camera/index.html


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---
title: 'Feature-Policy: camera'
slug: Web/HTTP/Headers/Feature-Policy/camera
translation_of: Web/HTTP/Headers/Feature-Policy/camera
---
<div>{{HTTPSidebar}}</div>

<p><span class="seoSummary">HTTP{{HTTPHeader("Feature-Policy")}} 头当中的<code>camera</code></span>指令控制着当前的文档是否允许使用视频输入设备。当这些策略被开启时，由<span class="seoSummary">{{domxref("MediaDevices.getUserMedia()")}} 返回的{{jsxref("Promise")}}将会reject一个 {{domxref("NotAllowedError")}}错误。</span></p>

<h2 id="语法结构">语法结构</h2>

<pre class="syntaxbox">Feature-Policy: camera &lt;allowlist&gt;;</pre>

<dl>
 <dt>&lt;allowlist&gt;</dt>
 <dd>{{page("Web/HTTP/Feature_Policy/Using_Feature_Policy", "allowlist")}}</dd>
</dl>

<h2 id="默认策略">默认策略</h2>

<p>默认值为 <code>'self'。</code></p>

<h2 id="定义">定义</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('Feature Policy')}}</td>
   <td>{{Spec2('Feature Policy')}}</td>
   <td>最初的定义。</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>


<p>{{Compat('http.headers.Feature-Policy.camera')}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{HTTPHeader("Feature-Policy")}} header</li>
 <li><a href="/en-US/docs/Web/HTTP/Feature_Policy">Feature Policy</a></li>
 <li><a href="/en-US/docs/Web/HTTP/Feature_Policy/Using_Feature_Policy">Using Feature Policy</a></li>
</ul>