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+---
+title: FormData.keys()
+slug: Web/API/FormData/keys
+translation_of: Web/API/FormData/keys
+---
+<p>{{APIRef("XMLHttpRequest")}}</p>
+
+<p><code><strong>FormData.keys()</strong></code> 该方法返回一个迭代器（{{jsxref("Iteration_protocols",'iterator')}}），遍历了该 formData  包含的所有key ，这些 key 是 {{domxref("USVString")}} 对象。</p>
+
+<div class="note">
+<p><strong>注意</strong>: 该方法在 <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a> 可用。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">formData.keys();</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个迭代器（ {{jsxref("Iteration_protocols","iterator")}}）。</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js;highlight:[7]">// 先创建一个 FormData 对象
+var formData = new FormData();
+formData.append('key1', 'value1');
+formData.append('key2', 'value2');
+
+// 输出所有的 key
+for (var key of formData.keys()) {
+   console.log(key);
+}
+</pre>
+
+<p>结果如下：</p>
+
+<pre>key1
+key2</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">说明</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('XMLHttpRequest','#dom-formdata','keys() (as iterator&lt;&gt;)')}}</td>
+   <td>{{Spec2('XMLHttpRequest')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</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</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(50.0)}}</td>
+   <td>{{CompatGeckoDesktop(44)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+  <tr>
+   <td>Available in web workers</td>
+   <td>{{CompatChrome(50.0)}}</td>
+   <td>{{CompatGeckoDesktop(44)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</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>Android Webview</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>{{CompatNo}}</td>
+   <td>{{CompatChrome(50.0)}}</td>
+   <td>{{CompatGeckoMobile(44)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(50.0)}}</td>
+  </tr>
+  <tr>
+   <td>Available in web workers</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(50.0)}}</td>
+   <td>{{CompatGeckoMobile(44)}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(50.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p> </p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("XMLHTTPRequest")}}</li>
+ <li><a href="/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest" title="Using XMLHttpRequest">Using XMLHttpRequest</a></li>
+ <li><a href="/en-US/docs/DOM/XMLHttpRequest/FormData/Using_FormData_Objects" title="DOM/XMLHttpRequest/FormData/Using_FormData_objects">Using FormData objects</a></li>
+ <li>{{HTMLElement("Form")}}</li>
+</ul>