files/zh-cn/web/api/headers/entries/index.html


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---
title: Headers.entries()
slug: Web/API/Headers/entries
translation_of: Web/API/Headers/entries
---
<p>{{APIRef}}{{SeeCompatTable}}</p>

<p><code><strong>Headers.entries()</strong></code> 以 {{jsxref("Iteration_protocols","迭代器")}} 的形式返回Headers对象中所有的键值对. </p>

<div class="note">
<p><strong>Note</strong>: 这个方法在 <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a>中是可用的.</p>
</div>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">headers.entries();</pre>

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

<p>返回一个 {{jsxref("Iteration_protocols","迭代器")}}.</p>

<h2 id="Example">Example</h2>

<pre class="brush: js;highlight:[7]">// Create a test Headers object
var myHeaders = new Headers();
myHeaders.append('Content-Type', 'text/xml');
myHeaders.append('Vary', 'Accept-Language');

// Display the key/value pairs
for (var pair of myHeaders.entries()) {
   console.log(pair[0]+ ': '+ pair[1]);
}
</pre>

<p>返回结果:</p>

<pre>content-type: text/xml
vary: Accept-Language</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('Fetch','#headers-class','Headers.entries() (as iterator&lt;&gt;)')}}</td>
   <td>{{Spec2('Fetch')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>{{CompatibilityTable}}</div>

<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>{{CompatUnknown}}</td>
   <td>{{CompatGeckoDesktop(44)}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</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>Firefox OS (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatGeckoMobile(44)}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

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

<ul>
 <li><a href="/en-US/docs/Web/API/ServiceWorker_API">ServiceWorker API</a></li>
 <li><a href="/en-US/docs/Web/HTTP/Access_control_CORS">HTTP access control (CORS)</a></li>
 <li><a href="/en-US/docs/Web/HTTP">HTTP</a></li>
</ul>