files/zh-cn/web/javascript/reference/operators/管道操作符/index.html


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---
title: 管道操作符
slug: Web/JavaScript/Reference/Operators/管道操作符
tags:
  - Experimental
  - JavaScript
  - Operator
  - 语法糖
  - 链式
  - 链式调用
translation_of: Web/JavaScript/Reference/Operators/Pipeline_operator
---
<div>{{jsSidebar("Operators")}} {{SeeCompatTable}}</div>

<p>试验性的管道操作符 <code>|&gt;</code> （目前其标准化流程处于 stage 1 阶段）允许以一种易读的方式去对函数链式调用。本质上来说，管道操作符是单参数函数调用的语法糖，它允许你像这样执行一个调用：</p>

<pre class="brush: js">let url = "%21" |&gt; decodeURI;</pre>

<p>使用传统语法写的话，等效的代码是这样的：</p>

<pre class="brush: js">let url = decodeURI("%21");
</pre>

<h2 id="语法">语法</h2>

<pre class="syntaxbox">expression |&gt; function</pre>

<h2 id="例子">例子</h2>

<h3 id="函数链式调用">函数链式调用</h3>

<p>当链式调用多个函数时，使用管道操作符可以改善代码的可读性。</p>

<pre class="brush: js">const double = (n) =&gt; n * 2;
const increment = (n) =&gt; n + 1;

// 没有用管道操作符
double(increment(double(5))); // 22

// 用上管道操作符之后
5 |&gt; double |&gt; increment |&gt; double; // 22
</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">规范</th>
   <th scope="col">状态</th>
   <th scope="col">备注</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><a href="http://tc39.github.io/proposal-pipeline-operator/">Pipeline operator draft</a></td>
   <td>Stage 1</td>
   <td>Not part of the ECMAScript specification yet.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性Edit">浏览器兼容性<a class="button section-edit only-icon" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators$edit#浏览器兼容性" rel="nofollow, noindex"><span>Edit</span></a></h2>

<div>


<p>{{Compat("javascript.operators.pipeline")}}</p>
</div>

<h2 id="参见">参见</h2>

<ul>
 <li>GitHub 上的 <a href="https://github.com/tc39/proposals">TC39/proposals</a></li>
</ul>