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+---
+title: 赋值运算符(=)
+slug: Web/JavaScript/Reference/Operators/Assignment
+tags:
+ - JavaScript
+ - 参考
+ - 操作者
+ - 语言特性
+ - 赋值运算符
+translation_of: Web/JavaScript/Reference/Operators/Assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p><span>简单赋值操作符(=)用于为变量赋值。赋值表达式本身的值为其完成后被赋值的变量的值。为了给多个变量赋一个值,可以链式使用赋值操作符。</span></p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-assignment.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x = y
+</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="简单赋值和链式赋值">简单赋值和链式赋值</h3>
+
+<pre class="brush: js notranslate">// 假设已经存在以下变量
+// x = 5
+// y = 10
+// z = 25
+
+x = y // x 为 10
+x = y = z // x, y 都为 25</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-assignment-operators', 'Assignment operators')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+
+
+<p>{{Compat("javascript.operators.assignment")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">Assignment operators in the JS guide</a></li>
+</ul>