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+---
+title: XMLHttpRequest.setRequestHeader()
+slug: Web/API/XMLHttpRequest/setRequestHeader
+tags:
+  - Reference
+  - XMLHttpRequests
+translation_of: Web/API/XMLHttpRequest/setRequestHeader
+---
+<p>{{APIRef('XMLHttpRequest')}}</p>
+
+<p><strong>XMLHttpRequest.setRequestHeader()</strong> 是设置HTTP请求头部的方法。此方法必须在  {{domxref("XMLHttpRequest.open", "open()")}} 方法和 {{domxref("XMLHttpRequest.send", "send()")}}   之间调用。如果多次对同一个请求头赋值，只会生成一个合并了多个值的请求头。</p>
+
+<p>如果没有设置 {{HTTPHeader("Accept")}} 属性，则此发送出{{domxref("XMLHttpRequest.send", "send()")}} 的值为此属性的默认值<code>*/*</code> 。</p>
+
+<p>安全起见，有些请求头的值只能由user agent设置：{{Glossary("Forbidden_header_name", "forbidden header names", 1)}}和{{Glossary("Forbidden_response_header_name", "forbidden response header names", 1)}}.</p>
+
+<div class="note">
+<p>自定义一些header属性进行跨域请求时，可能会遇到"<strong>not allowed by Access-Control-Allow-Headers in preflight response</strong>"，你可能需要在你的服务端设置"Access-Control-Allow-Headers"。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">myReq.setRequestHeader(<var>header</var>, <var>value</var>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>header</code></dt>
+ <dd>属性的名称。</dd>
+ <dt><code>value</code></dt>
+ <dd>属性的值。</dd>
+</dl>
+
+<h2 id="说明">说明</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('XMLHttpRequest', '#the-setRequestHeader()-method', 'setRequestHeader()')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td>WHATWG living standard</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="兼容性">兼容性</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 (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(1)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatIe('5')}}<sup>[1]</sup><br>
+    {{CompatIe('7')}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatSafari('1.2')}}</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>{{CompatUnknown}}</td>
+   <td>1.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] 使用ActiveXObject()实现的。Internet Explorer 7之后使用的是标准的XMLHttpRequest。</p>
+
+<h2 id="参考">参考</h2>
+
+<p><a href="/zh-CN/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest">使用XMLHttpRequest</a></p>