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---
title: Date.prototype.getDay()
slug: Web/JavaScript/Reference/Global_Objects/Date/getDay
translation_of: Web/JavaScript/Reference/Global_Objects/Date/getDay
---
<p>{{JSRef}}</p>
<p><strong><code>getDay()</code></strong> 方法根据本地时间，返回一个具体日期中一周的第几天，0 表示星期天。对于某个月中的第几天，参考{{jsxref("Date.prototype.getDate()")}}.</p>
<div>{{EmbedInteractiveExample("pages/js/date-getday.html")}}</div>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox language-html" style="margin-bottom: 0px; padding: 1em; border-left-width: 6px; border-left-style: solid; font-family: Consolas, Monaco, 'Andale Mono', monospace; font-size: 14px; text-shadow: none; direction: ltr; white-space: normal; background-color: rgba(212, 221, 228, 0.498039);"><code class="language-html" style="font-family: Consolas, Monaco, 'Andale Mono', monospace; color: inherit; text-shadow: none; direction: ltr;"><em>dateObj</em>.getDay()</code>
</pre>
<h3 id="Description" name="Description">返回值</h3>
<p>根据本地时间，返回一个0到6之间的整数值，代表星期几： 0 代表星期日， 1 代表星期一，2 代表星期二， 依次类推。</p>
<h2 id="Examples" name="Examples">例子</h2>
<h3 id="Example_Using_getDay" name="Example:_Using_getDay">使用<code>getDay()</code></h3>
<p>下面第二条语句，基于{{jsxref("Date")}}对象 <code>Xmas95</code> 的值，把 1 赋值给 <code>weekday</code>。也就是说1995年12月25日是星期一。</p>
<pre class="brush:js language-js" style="padding: 1em 0px 1em 30px; border-left-width: 6px; border-left-style: solid; font-family: Consolas, Monaco, 'Andale Mono', monospace; font-size: 14px; text-shadow: none; direction: ltr; white-space: normal; background-color: rgba(234, 239, 242, 0.247059);"><code class="language-js" style="font-family: Consolas, Monaco, 'Andale Mono', monospace; color: inherit; text-shadow: none; direction: ltr; white-space: pre;"><span class="keyword token" style="color: #0077aa;">var</span> Xmas95 <span class="operator token" style="background: rgba(255, 255, 255, 0.498039); color: #a67f59;">=</span> <span class="keyword token" style="color: #0077aa;">new</span> <span class="class-name token">Date</span><span class="punctuation token" style="color: #999999;">(</span><span class="string token" style="color: #669900;">"December 25, 1995 23:15:30"</span><span class="punctuation token" style="color: #999999;">)</span><span class="punctuation token" style="color: #999999;">;</span>
<span class="keyword token" style="color: #0077aa;">var</span> weekday <span class="operator token" style="background: rgba(255, 255, 255, 0.498039); color: #a67f59;">=</span> Xmas95<span class="punctuation token" style="color: #999999;">.</span><span class="function token">getDay<span class="punctuation token" style="color: #999999;">(</span></span><span class="punctuation token" style="color: #999999;">)</span><span class="punctuation token" style="color: #999999;">;</span>
<span class="function token">console.log<span class="punctuation token" style="color: #999999;">(</span></span>weekday<span class="punctuation token" style="color: #999999;">)</span><span class="punctuation token" style="color: #999999;">;</span><span class="comment token" style="color: #708090; display: inherit;"> // 1</span></code></pre>
<div class="blockIndicator note">
<p dir="ltr">注意：如果需要，可以使用{{jsxref("DateTimeFormat", "Intl.DateTimeFormat")}}与一个额外的<code>options</code> 参数，从而返回这天的全称（如<code>"Monday"</code>）.使用此方法，结果会更加国际化：</p>
<pre class="brush: js"><code>var options = { weekday: 'long'};
console.log(new Intl.DateTimeFormat('en-US', options).format(Xmas95));
// Monday
console.log(new Intl.DateTimeFormat('de-DE', options).format(Xmas95));
// Montag</code></pre>
</div>
<h2 id="规范" style="margin-bottom: 20px; line-height: 30px;">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">规范版本</th>
<th scope="col">规范状态</th>
<th scope="col">注解</th>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-date.prototype.getday', 'Date.prototype.getDay')}}<span class="hidden"> </span><span class="hidden"> </span></td>
<td>{{Spec2('ESDraft')}} </td>
<td></td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-date.prototype.getday', 'Date.prototype.getDay')}} </td>
<td>{{Spec2('ES6')}}</td>
<td></td>
</tr>
<tr>
<td>{{SpecName('ES5.1', '#sec-15.9.5.16', 'Date.prototype.getDay')}} </td>
<td>{{Spec2('ES5.1')}}</td>
<td></td>
</tr>
<tr>
<td>{{SpecName('ES1')}}</td>
<td>{{Spec2('ES1')}}</td>
<td>Initial definition. Implemented in JavaScript 1.0.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性" style="margin-bottom: 20px; line-height: 30px;">浏览器兼容性</h2>
<p>{{Compat("javascript.builtins.Date.getDay")}}</p>
<h2 id="See_Also" name="See_Also" style="margin-bottom: 20px; line-height: 30px;">相关链接</h2>
<ul>
<li>{{jsxref("Date.prototype.getUTCDate()")}}</li>
<li>{{jsxref("Date.prototype.getUTCDay()")}}</li>
<li>{{jsxref("Date.prototype.setDate()")}}</li>
</ul>
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