---
title: 除法 (/)
slug: Web/JavaScript/Reference/Operators/Division
tags:
  - JavaScript
  - 参考
  - 语言特征
  - 运算符
translation_of: Web/JavaScript/Reference/Operators/Division
---
<div>{{jsSidebar("Operators")}}</div>

<p>除法运算符 (<code>/</code>) 计算了两个操作数的商，左边的数是被除数，右边的是除数</p>

<div>{{EmbedInteractiveExample("pages/js/expressions-division.html")}}</div>

<div></div>



<h2 id="语法">语法</h2>

<pre class="syntaxbox notranslate"><strong>Operator:</strong> <var>x</var> / <var>y</var>
</pre>

<h2 id="例子">例子</h2>

<h3 id="基本除法">基本除法</h3>

<pre class="brush: js notranslate">1 / 2              // 0.5

Math.floor(3 / 2) // 1

1.0 / 2.0         // 0.5
</pre>

<h3 id="除以0">除以0</h3>

<pre class="brush: js notranslate">2.0 / 0     // Infinity

2.0 / 0.0   // Infinity, because 0.0 === 0

2.0 / -0.0  // -Infinity</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-multiplicative-operators', 'Division operator')}}</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("javascript.operators.division")}}</p>

<h2 id="参见">参见</h2>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Addition">Addition operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction">Subtraction operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Multiplication">Multiplication operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Remainder">Remainder operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Exponentiation">Exponentiation operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Increment">Increment operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Decrement">Decrement operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_negation">Unary negation operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus">Unary plus operator</a></li>
</ul>