From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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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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