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+---
+title: Date.prototype.setMonth()
+slug: Web/JavaScript/Reference/Global_Objects/Date/setMonth
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/setMonth
+---
+<div>{{JSRef("Global_Objects", "Date")}}</div>
+
+<p><code><strong>setMonth()</strong></code> 方法根据本地时间为一个设置年份的日期对象设置月份。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-setmonth.html")}}</div>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><var>dateObj</var>.setMonth(<em>monthValue</em>[, <em>dayValue</em>])</pre>
+
+<h3 id="Versions_prior_to_JavaScript_1.3" name="Versions_prior_to_JavaScript_1.3">JavaScript 1.3版本之前</h3>
+
+<pre class="syntaxbox"><var>dateObj</var>.setMonth(<em>monthValue</em>)</pre>
+
+<h3 id="Parameter" name="Parameter">参数</h3>
+
+<dl>
+ <dt><code>monthValue</code></dt>
+ <dd>介于 0 到 11 之间的整数（表示一月到十二月）。</dd>
+</dl>
+
+<dl>
+ <dt><code>dayValue</code></dt>
+ <dd>从 1 到 31 之间的整数，表示月份中的第几天。0为上个月最后一天</dd>
+ <dt>返回值！</dt>
+ <dd>基于 1 January 1970 00:00:00 UTC 开始计算的毫秒数</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>如果不指定 <code>dayValue</code> 参数，就会使用 {{jsxref("Date.getDate", "getDate")}} 方法的返回值。</p>
+
+<p>如果有一个指定的参数超出了合理范围，<code>setMonth</code> 会相应地更新日期对象中的日期信息。<font face="Courier New, Andale Mono, monospace">例如，为</font> <code>monthValue</code> 指定 15，则年份会加 1，月份将会使用 3。</p>
+
+<h2 id="Examples" name="Examples">例子</h2>
+
+<h3 id="Example_Using_setMonth" name="Example:_Using_setMonth">例子：使用<code>setMonth方法</code></h3>
+
+<pre class="brush: js">var theBigDay = new Date();
+theBigDay.setMonth(6);
+</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-15.9.5.38', 'Date.prototype.setMonth')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-date.prototype.setmonth', 'Date.prototype.setMonth')}}</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.setMonth")}}</p>
+
+<h2 id="See_Also" name="See_Also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Date.prototype.getMonth()")}}</li>
+ <li>{{jsxref("Date.prototype.setUTCMonth()")}}</li>
+</ul>