From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Array.prototype.values()
+slug: Web/JavaScript/Reference/Global_Objects/Array/values
+tags:
+  - Array
+  - ECMAScript 2015
+  - Iterator
+  - JavaScript
+  - Prototype
+  - 数组
+  - 方法
+  - 迭代
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/values
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>values()</code></strong> 方法返回一个新的 <strong><code>Array Iterator</code></strong> 对象，该对象包含数组每个索引的值</p>
+
+<div>{{EmbedInteractiveExample("pages/js/array-values.html")}}</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><var>arr</var>.values()</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的 {{jsxref("Array")}} 迭代对象。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_for...of_循环进行迭代">使用 <code>for...of</code> 循环进行迭代</h3>
+
+<pre class="brush: js notranslate">let arr = ['w', 'y', 'k', 'o', 'p'];
+let eArr = arr.values();
+
+for (let letter of eArr) {
+  console.log(letter);
+} //"w" "y "k" "o" "p"</pre>
+
+<p><strong>Array.prototype.values</strong> 是 <strong>Array.prototype[Symbol.iterator] </strong>的默认实现。</p>
+
+<pre class="notranslate">Array.prototype.values === Array.prototype[Symbol.iterator]  // true </pre>
+
+<h3 id="使用_.next_迭代">使用 <code>.next()</code> 迭代</h3>
+
+<pre class="notranslate">var arr = ['a', 'b', 'c', 'd', 'e'];
+var iterator = arr.values();
+iterator.next();               // Object { value: "a", done: false }
+iterator.next().value;         // "b"
+iterator.next()["value"];      // "c"
+iterator.next();               // Object { value: "d", done: false }
+iterator.next();               // Object { value: "e", done: false }
+iterator.next();               // Object { value: undefined, done: true }
+iteraroe.next().value;         // undefined</pre>
+
+<div class="blockIndicator warning">
+<p>一次性：数组迭代器是一次性的，或者说临时对象</p>
+</div>
+
+<p>例子：</p>
+
+<pre class="notranslate">var arr = ['a', 'b', 'c', 'd', 'e'];
+ var iterator = arr.values();
+ for (let letter of iterator) {
+ console.log(letter);
+} //"a" "b" "c" "d"
+for (let letter of iterator) {
+console.log(letter);
+} // undefined</pre>
+
+<p><strong>解释:</strong> 当 <code>next().done=true</code> 或 <code>currentIndex&gt;length</code> 时， <code>for..of</code> 循环结束。参见 <a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration protocols</a> 。</p>
+
+<p><strong>值</strong>: 数组迭代器中存储的是原数组的地址，而不是数组元素值。</p>
+
+<pre class="notranslate">var arr = ['a', 'b', 'c', 'd', 'e'];
+var iterator = arr.values();
+console.log(iterator); // Array Iterator {  }
+iterator.next().value; // "a"
+arr[1] = 'n';
+iterator.next().value; //  "n"
+</pre>
+
+<div class="blockIndicator note">
+<p>如果数组中元素改变，那么迭代器的值也会改变</p>
+</div>
+
+<p class="hidden"><strong>TODO</strong>: please write about why we need it, use cases.</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-array.prototype.values', 'Array.prototype.values')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>首次定义</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-array.prototype.values', 'Array.prototype.values')}}</td>
+   <td>{{Spec2('ESDraft')}}</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.Array.values")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Array.prototype.keys()")}}</li>
+ <li>{{jsxref("Array.prototype.entries()")}}</li>
+ <li>{{jsxref("Array.prototype.forEach()")}}</li>
+ <li>{{jsxref("Array.prototype.every()")}}</li>
+ <li>{{jsxref("Array.prototype.some()")}}</li>
+</ul>
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