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+---
+title: Date.prototype.setDate()
+slug: Web/JavaScript/Reference/Global_Objects/Date/setDate
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/setDate
+---
+<div>{{JSRef("Global_Objects", "Date")}}</div>
+
+<p><code><strong>setDate()</strong></code> 方法根据本地时间来指定一个日期对象的天数。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-setdate.html")}}</div>
+
+
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code><var>dateObj</var>.setDate(<em>dayValue</em>)</code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>dayValue</code></dt>
+ <dd>一个整数，表示该月的第几天。</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>如果 <code>dayValue</code> 超出了月份的合理范围，<code>setDate</code> 将会相应地更新 <code>Date</code> 对象。</p>
+
+<p>例如，如果为 <code>dayValue</code> 指定0，那么日期就会被设置为上个月的最后一天。</p>
+
+<p>如果dayValue被设置为负数，日期会设置为上个月最后一天往前数这个负数绝对值天数后的日期。-1会设置为上月最后一天的前一天（译者注：例如当前为4月，如果setDate(-2),则为3月29日）</p>
+
+<h2 id="Examples" name="Examples">例子</h2>
+
+<h3 id="Example_Using_setDate" name="Example:_Using_setDate">例子：使用<code>setDate</code>方法</h3>
+
+<pre class="brush:js">var theBigDay = new Date(1962, 6, 7); // 1962-07-07
+theBigDay.setDate(24);  // 1962-07-24
+theBigDay.setDate(32);  // 1962-08-01</pre>
+
+<h2 id="规范">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>ECMAScript 1st Edition. Implemented in JavaScript 1.0</td>
+   <td>Standard</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.9.5.36', 'Date.prototype.setDate')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-date.prototype.setdate', 'Date.prototype.setDate')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Date.setDate")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Date.prototype.getDate()")}}</li>
+ <li>{{jsxref("Date.prototype.setUTCDate()")}}</li>
+</ul>