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---
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>
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