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---
title: Storage.setItem()
slug: Web/API/Storage/setItem
tags:
- API
- Storage
- Web Storage
translation_of: Web/API/Storage/setItem
---
<p>{{APIRef("Web Storage API")}}</p>
<p><strong><code>setItem()</code> </strong>作为 {{domxref("Storage")}} 接口的方法,接受一个键名和值作为参数,将会把键名添加到存储中,如果键名已存在,则更新其对应的值。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox notranslate"><em>storage</em>.setItem(<em>keyName</em>, <em>keyValue</em>);</pre>
<h3 id="参数">参数</h3>
<dl>
<dt><code><em>keyName</em></code></dt>
<dd>一个 {{domxref("DOMString")}},要创建或更新的键名。</dd>
<dt><code><em>keyValue</em></code></dt>
<dd>一个 {{domxref("DOMString")}},要创建或更新的键名对应的值。</dd>
</dl>
<h3 id="返回值">返回值</h3>
<p>{{jsxref("undefined")}}</p>
<h2 id="示例">示例</h2>
<p>下面的函数在本地存储中创建三个数据项。</p>
<pre class="brush: js notranslate">function populateStorage() {
localStorage.setItem('bgcolor', 'red');
localStorage.setItem('font', 'Helvetica');
localStorage.setItem('image', 'myCat.png');
}</pre>
<div class="note">
<p><strong>备注:</strong>一个实际的例子 <a href="https://mdn.github.io/dom-examples/web-storage/">Web Storage Demo</a>。</p>
</div>
<h2 id="规范">规范</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('Web Storage', '#dom-storage-setitem', 'setItem()')}}</td>
<td>{{Spec2('Web Storage')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("api.Storage.setItem")}}</p>
<h2 id="参见">参见</h2>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage/getItem">Storage.getItem()</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage/removeItem">Storage.removeItem()</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API">Using the Web Storage API</a></li>
</ul>
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