files/zh-cn/web/api/urlsearchparams/has/index.html


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---
title: URLSearchParams.has()
slug: Web/API/URLSearchParams/has
translation_of: Web/API/URLSearchParams/has
---
<p>{{ApiRef("URL API")}}{{SeeCompatTable}} </p>

<p>{{domxref("URLSearchParams")}} 的<strong>has() </strong>方法返回一个 {{jsxref("Boolean")}} 表示一个指定的键名对应的值是否存在。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">var <em>hasName</em> = URLSearchParams.has(<em>name</em>)</pre>

<h3 id="参数">参数</h3>

<dl>
 <dt>键名</dt>
 <dd>要查找的参数的键名。</dd>
</dl>

<h3 id="返回值">返回值</h3>

<p>一个 {{jsxref("Boolean")}}.</p>

<h2 id="示例">示例</h2>

<pre class="brush: js">let url = new URL('https://example.com?foo=1&amp;bar=2');
let params = new URLSearchParams(url.search.slice(1));

params.has('bar') === true; //true
</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">规范</th>
   <th scope="col">状态</th>
   <th scope="col">说明</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('URL', '#dom-urlsearchparams-has', "has()")}}</td>
   <td>{{Spec2('URL')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<div>


<p>{{Compat("api.URLSearchParams.has")}}</p>
</div>