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+---
+title: Generator
+slug: Web/JavaScript/Reference/Global_Objects/Generator
+translation_of: Web/JavaScript/Reference/Global_Objects/Generator
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Generator</strong></code> là một object return bởi một {{jsxref("Statements/function*", "generator function", "", 1)}}, nó phù hợp với cả <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterable_protocol">iterable protocol</a> và <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol">iterator protocol</a>.</p>
+
+<h2 id="Cú_pháp">Cú pháp</h2>
+
+<pre class="syntaxbox">function* gen() {
+  yield 1;
+  yield 2;
+  yield 3;
+}
+
+var g = gen(); // "Generator { }"</pre>
+
+<h2 id="Phương_thức">Phương thức</h2>
+
+<dl>
+ <dt>{{jsxref("Generator.prototype.next()")}}</dt>
+ <dd>Trả về giá trị yielded, được khai báo qua câu lệnh {{jsxref("Operators/yield", "yield")}}.</dd>
+ <dt>{{jsxref("Generator.prototype.return()")}}</dt>
+ <dd>Trả về giá trị và kết thúc generator.</dd>
+ <dt>{{jsxref("Generator.prototype.throw()")}}</dt>
+ <dd>Quăng lỗi vào generator (đồng thời kết thúc generator, trừ khi được bắt lại trong generator đó).</dd>
+</dl>
+
+<h2 id="Ví_dụ">Ví dụ</h2>
+
+<h3 id="Một_vòng_lặp_vô_hạn">Một vòng lặp vô hạn</h3>
+
+<pre class="brush: js">function* idMaker() {
+    var index = 0;
+    while(true)
+        yield index++;
+}
+
+var gen = idMaker(); // "Generator { }"
+
+console.log(gen.next().value); // 0
+console.log(gen.next().value); // 1
+console.log(gen.next().value); // 2
+// ...</pre>
+
+<h2 id="Generator_object_cũ">Generator object cũ</h2>
+
+<p>Firefox (SpiderMonkey) đã hiện thực phiên bản generators đầu tiên trong <a href="/en-US/docs/Web/JavaScript/New_in_JavaScript/1.7">JavaScript 1.7</a>, lúc đó dấu sao (*) trong khai báo không bắt buộc (bạn chỉ cần dùng từ khóa <code>yield</code> bên trong hàm). Tuy nhiên, kiểu viết này đã không còn được hổ trợ từ Firefox 58 (released ngày 23, tháng 1, 2018) ({{bug(1083482)}}).</p>
+
+<h3 id="Các_phương_thức_generator_cũ">Các phương thức generator cũ</h3>
+
+<dl>
+ <dt><code>Generator.prototype.next() </code>{{non-standard_inline}}</dt>
+ <dd>Returns a value yielded by the {{jsxref("Operators/yield", "yield")}} expression. This corresponds to <code>next()</code> in the ES2015 generator object.</dd>
+ <dt><code>Generator.prototype.close()</code> {{non-standard_inline}}</dt>
+ <dd>Closes the generator, so that when calling <code>next()</code> an {{jsxref("StopIteration")}} error will be thrown. This corresponds to the <code>return()</code> method in the ES2015 generator object.</dd>
+ <dt><code>Generator.prototype.send()</code> {{non-standard_inline}}</dt>
+ <dd>Used to send a value to a generator. The value is returned from the {{jsxref("Operators/yield", "yield")}} expression, and returns a value yielded by the next {{jsxref("Operators/yield", "yield")}} expression. <code>send(x)</code> corresponds to <code>next(x)</code> in the ES2015 generator object.</dd>
+ <dt><strong><code>Generator.</code></strong><code>prototype.</code><strong><code>throw()</code> </strong> {{non-standard_inline}}</dt>
+ <dd>Throws an error to a generator. This corresponds to the <code>throw()</code> method in the ES2015 generator object.</dd>
+</dl>
+
+<h3 id="Legacy_generator_example">Legacy generator example</h3>
+
+<pre class="brush: js">function fibonacci() {
+  var a = yield 1;
+  yield a * 2;
+}
+
+var it = fibonacci();
+console.log(it);          // "Generator {  }"
+console.log(it.next());   // 1
+console.log(it.send(10)); // 20
+console.log(it.close());  // undefined
+console.log(it.next());   // throws StopIteration (as the generator is now closed)
+</pre>
+
+<h2 id="Specifications">Specifications</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('ES2015', '#sec-generator-objects', 'Generator objects')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-generator-objects', 'Generator objects')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Trình_duyệt_hổ_trợ">Trình duyệt hổ trợ</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Generator")}}</p>
+
+<h2 id="Xem_thêm">Xem thêm</h2>
+
+<h3 id="Legacy_generators">Legacy generators</h3>
+
+<ul>
+ <li>{{jsxref("Statements/Legacy_generator_function", "The legacy generator function", "", 1)}}</li>
+ <li>{{jsxref("Operators/Legacy_generator_function", "The legacy generator function expression", "", 1)}}</li>
+ <li>{{jsxref("StopIteration")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features/The_legacy_Iterator_protocol">The legacy Iterator protocol</a></li>
+</ul>
+
+<h3 id="ES2015_generators">ES2015 generators</h3>
+
+<ul>
+ <li>{{jsxref("Functions", "Functions", "", 1)}}</li>
+ <li>{{jsxref("Statements/function", "function")}}</li>
+ <li>{{jsxref("Operators/function", "function expression")}}</li>
+ <li>{{jsxref("Function")}}</li>
+ <li>{{jsxref("Statements/function*", "function*")}}</li>
+ <li>{{jsxref("Operators/function*", "function* expression")}}</li>
+ <li>{{jsxref("GeneratorFunction")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol">The Iterator protocol</a></li>
+</ul>