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+---
+title: Number.isInteger()
+slug: Web/JavaScript/Reference/Global_Objects/Number/isInteger
+tags:
+  - JavaScript
+  - Method
+  - Number
+  - Reference
+  - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/isInteger
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Number.isInteger()</code></strong> 方法用来判断给定的参数是否为整数。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/number-isinteger.html")}}</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code>Number.isInteger(v<var>alue</var>)</code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>要判断此参数是否为整数</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>判断给定值是否是整数的 {{jsxref("Boolean")}} 值。</p>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>如果被检测的值是整数，则返回 <code>true</code>，否则返回 <code>false</code>。注意 {{jsxref("Global_Objects/NaN", "NaN")}} 和正负 {{jsxref("Global_Objects/Infinity", "Infinity")}} 不是整数。</p>
+
+<h2 id="Example" name="Example">示例</h2>
+
+<pre class="brush: js">Number.isInteger(0);         // true
+Number.isInteger(1);         // true
+Number.isInteger(-100000);   // true
+
+Number.isInteger(0.1);       // false
+Number.isInteger(Math.PI);   // false
+
+Number.isInteger(Infinity);  // false
+Number.isInteger(-Infinity); // false
+Number.isInteger("10");      // false
+Number.isInteger(true);      // false
+Number.isInteger(false);     // false
+Number.isInteger([1]);       // false</pre>
+
+<h2 id="Polyfill" name="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">Number.isInteger = Number.isInteger || function(value) {
+    return typeof value === "number" &amp;&amp;
+           isFinite(value) &amp;&amp;
+           Math.floor(value) === value;
+};
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-number.isinteger', 'Number.isInteger')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-number.isinteger', 'Number.isInteger')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<p>{{Compat("javascript.builtins.Number.isInteger")}}</p>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Global_Objects/Number", "Number")}}</li>
+</ul>