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+---
+title: URLSearchParams.keys()
+slug: Web/API/URLSearchParams/keys
+tags:
+  - API
+  - Experimental
+  - Method
+  - Reference
+  - URL API
+  - URLSearchParams
+translation_of: Web/API/URLSearchParams/keys
+---
+<p>{{APIRef("URL API")}}{{SeeCompatTable}}</p>
+
+<p>URLSearchParams.keys()返回一个{{jsxref("Iteration_protocols",'iterator')}}，遍历器允许遍历对象中包含的所有键。这些键都是{{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>中也可使用</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">searchParams.keys();</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个{{jsxref("Iteration_protocols","iterator")}}.</p>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js;highlight:[5]">// 建立一个测试用URLSearchParams对象
+var searchParams = new URLSearchParams("key1=value1&amp;key2=value2");
+
+// 输出键值对
+for(var key of searchParams.keys()) {
+  console.log(key);
+}
+</pre>
+
+<p>结果如下：</p>
+
+<pre>key1
+key2</pre>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.URLSearchParams.keys")}}</p>
+</div>
+
+<h2 id="另请参考">另请参考</h2>
+
+<ul>
+ <li>其他URL相关接口: {{domxref("URL")}}, {{domxref("URLUtils")}}.</li>
+</ul>