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+---
+title: Symbol.asyncIterator
+slug: Web/JavaScript/Reference/Global_Objects/Symbol/asyncIterator
+translation_of: Web/JavaScript/Reference/Global_Objects/Symbol/asyncIterator
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Symbol.asyncIterator</strong></code> 符号指定了一个对象的默认异步迭代器。如果一个对象设置了这个属性，它就是异步可迭代对象，可用于<code><a href="/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of">for await...of</a></code>循环。</p>
+
+
+
+<h2 id="描述">描述</h2>
+
+<p><code>Symbol.asyncIterator</code> 是一个用于访问对象的<code>@@asyncIterator</code>方法的内建符号。一个异步可迭代对象必须要有<code>Symbol.asyncIterator</code>属性。</p>
+
+<p>{{js_property_attributes(0,0,0)}}</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="自定义异步可迭代对象">自定义异步可迭代对象</h3>
+
+<p>你可以通过设置<code>[Symbol.asyncIterator]</code>属性来自定义异步可迭代对象。</p>
+
+<pre class="brush: js">const myAsyncIterable = new Object();
+myAsyncIterable[Symbol.asyncIterator] = async function*() {
+    yield "hello";
+    yield "async";
+    yield "iteration!";
+};
+
+(async () =&gt; {
+    for await (const x of myAsyncIterable) {
+        console.log(x);
+        // expected output:
+        //    "hello"
+        //    "async"
+        //    "iteration!"
+    }
+})();
+</pre>
+
+<h3 id="内建异步可迭代对象">内建异步可迭代对象</h3>
+
+<p>目前没有默认设定了<code>[Symbol.asyncIterator]</code>属性的JavaScript内建的对象。不过，WHATWG（网页超文本应用技术工作小组）Streams会被设定为第一批异步可迭代对象，<code>[Symbol.asyncIterator]</code> 最近已在设计规范中落地。</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">标准</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ES2018', '#sec-symbol.asynciterator', 'Symbol.asyncIterator')}}</td>
+   <td>{{Spec2('ES2018')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{compat("javascript.builtins.Symbol.asyncIterator")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration protocols</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of">for await... of</a></li>
+</ul>