---
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>