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---
title: 乘法 (*)
slug: Web/JavaScript/Reference/Operators/Multiplication
translation_of: Web/JavaScript/Reference/Operators/Multiplication
---
<div>{{jsSidebar("Operators")}}</div>
<p>乘法运算符 (<code>*</code>) 计算操作数的乘积。</p>
<div>{{EmbedInteractiveExample("pages/js/expressions-multiplication.html")}}</div>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><strong>Operator:</strong> <var>x</var> * <var>y</var>
</pre>
<h2 id="例子">例子</h2>
<h3 id="使用数字相乘">使用数字相乘</h3>
<pre class="brush: js"> 2 * 2 // 4
-2 * 2 // -4
</pre>
<h3 id="使用_Infinity_相乘">使用 Infinity 相乘</h3>
<pre class="brush: js">Infinity * 0 // NaN
Infinity * Infinity // Infinity</pre>
<h3 id="使用非数字相乘">使用非数字相乘</h3>
<pre class="brush: js">'foo' * 2 // NaN</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', 'Multiplication operator')}}</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("javascript.operators.multiplication")}}</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/Division">Division 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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