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+---
+title: 圆括号运算符
+slug: Web/JavaScript/Reference/Operators/Grouping
+tags:
+  - JavaScript
+  - Operator
+  - 操作符
+translation_of: Web/JavaScript/Reference/Operators/Grouping
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>圆括号运算符 <code>( )</code> 用于控制表达式中的运算优先级。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-groupingoperator.html")}}</div>
+
+<p class="hidden">这些交互的事例资源都是基于Github的仓库.如果你想提交更多的交互事例,请克隆这个url<a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> 并且向我们发送合并请求。</p>
+
+<h2 id="语法">语法</h2>
+
+<p>译者：下列语法是 MDN 上已知的最简单的之一。</p>
+
+<pre class="syntaxbox"> ( )</pre>
+
+<h2 id="说明">说明</h2>
+
+<p>圆括号运算符由一对圆括号组成，包裹表达式和子表达式用来覆盖常规的<a href="/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence">运算符优先级</a>，达到低优先级的表达式比高优先级的表达式更早运算。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的代码展示了加法运算先于乘法运算的情况。</p>
+
+<pre class="brush:js">var a = 1;
+var b = 2;
+var c = 3;
+
+// default precedence
+a + b * c     // 7
+// evaluated by default like this
+a + (b * c)   // 7
+
+// now overriding precedence
+// addition before multiplication
+(a + b) * c   // 9
+
+// which is equivalent to
+a * c + b * c // 9
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-grouping-operator', 'The Grouping Operator')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-grouping-operator', 'The Grouping Operator')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-11.1.6', 'The Grouping Operator')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1', '#sec-11.1.4', 'The Grouping Operator')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>初始化定义.在JavaScript1.0中生效</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div class="hidden">本页的浏览器兼容性表都是基于结构数据，如果你想更新数据.可以查看 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并且请给我们发送合并请求.</div>
+
+<p>{{Compat("javascript.operators.grouping")}}</p>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence">运算符优先级</a></li>
+ <li>{{jsxref("Operators/delete", "delete")}}</li>
+ <li>{{jsxref("Operators/typeof", "typeof")}}</li>
+</ul>