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128 lines
14 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<p><code>@@iterator</code> 属性和 <a href="Reference/Global_Objects/Array/values" title="values() 方法返回一个新的 Array Iterator 对象，该对象包含数组每个索引的值"><code>Array.prototype.values()</code></a> 属性的初始值均为同一个函数对象。</p>
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<h2 id="语法">语法</h2>
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<pre class="brush: js"><var>arr</var>[Symbol.iterator]()</pre>
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<h3 id="返回值">返回值</h3>
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<p>数组的 <strong>iterator </strong>方法，默认情况下与 <a href="Reference/Global_Objects/Array/values" title="values() 方法返回一个新的 Array Iterator 对象，该对象包含数组每个索引的值"><code>values()</code></a> 返回值相同</p>
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<h2 id="示例">示例</h2>
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<h3 id="使用_for...of_循环进行迭代"><font face="Open Sans, Arial, sans-serif">使用 </font><code>for...of</code> 循环进行迭代</h3>
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<pre class="brush: js">var arr = ['w', 'y', 'k', 'o', 'p'];
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var eArr = arr[Symbol.iterator]();
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// 您的浏览器必须支持for...of循环
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// 以及let —— 将变量作用域限定在 for 循环中
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for (let letter of eArr) {
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console.log(letter);
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}
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</pre>
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<h3 id="另一种迭代方式">另一种迭代方式</h3>
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<pre class="brush: js">var arr = ['w', 'y', 'k', 'o', 'p'];
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var eArr = arr[Symbol.iterator]();
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console.log(eArr.next().value); // w
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console.log(eArr.next().value); // y
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console.log(eArr.next().value); // k
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console.log(eArr.next().value); // o
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console.log(eArr.next().value); // p
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</pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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<tr>
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<th scope="col">规范名称</th>
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<th scope="col">规范状态</th>
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<th scope="col">备注</th>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-array.prototype-@@iterator" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Array.prototype[@@iterator]()</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td>首次定义</td>
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</tr>
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<tr>
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<td><a class="external" href="https://tc39.github.io/ecma262/#sec-array.prototype-@@iterator" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Array.prototype[@@iterator]()</small></a></td>
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<td><span class="spec-Draft">Draft</span></td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<div>
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<div class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
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<p></p><div class="bc-data"><a class="bc-github-link external" href="https://github.com/mdn/browser-compat-data" rel="noopener">Update compatibility data on GitHub</a><table class="bc-table bc-table-js"><thead><tr class="bc-platforms"><td></td><th class="bc-platform-desktop" colspan="6"><span>Desktop</span></th><th class="bc-platform-mobile" colspan="7"><span>Mobile</span></th><th class="bc-platform-server" colspan="1"><span>Server</span></th></tr><tr class="bc-browsers"><td></td><th class="bc-browser-chrome"><span class="bc-head-txt-label bc-head-icon-chrome">Chrome</span></th><th class="bc-browser-edge"><span class="bc-head-txt-label bc-head-icon-edge">Edge</span></th><th class="bc-browser-firefox"><span class="bc-head-txt-label bc-head-icon-firefox">Firefox</span></th><th class="bc-browser-ie"><span class="bc-head-txt-label bc-head-icon-ie">Internet Explorer</span></th><th class="bc-browser-opera"><span class="bc-head-txt-label bc-head-icon-opera">Opera</span></th><th class="bc-browser-safari"><span class="bc-head-txt-label bc-head-icon-safari">Safari</span></th><th class="bc-browser-webview_android"><span class="bc-head-txt-label bc-head-icon-webview_android">Android webview</span></th><th class="bc-browser-chrome_android"><span class="bc-head-txt-label bc-head-icon-chrome_android">Chrome for Android</span></th><th class="bc-browser-edge_mobile"><span class="bc-head-txt-label bc-head-icon-edge_mobile">Edge Mobile</span></th><th class="bc-browser-firefox_android"><span class="bc-head-txt-label bc-head-icon-firefox_android">Firefox for Android</span></th><th class="bc-browser-opera_android"><span class="bc-head-txt-label bc-head-icon-opera_android">Opera for Android</span></th><th class="bc-browser-safari_ios"><span class="bc-head-txt-label bc-head-icon-safari_ios">Safari on iOS</span></th><th class="bc-browser-samsunginternet_android"><span class="bc-head-txt-label bc-head-icon-samsunginternet_android">Samsung Internet</span></th><th class="bc-browser-nodejs"><span class="bc-head-txt-label bc-head-icon-nodejs">Node.js</span></th></tr></thead><tbody><tr><th scope="row"><code>@@iterator</code></th><td class="bc-supports-yes bc-browser-chrome"><span class="bc-browser-name">Chrome</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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38</td><td class="bc-supports-yes bc-browser-edge"><span class="bc-browser-name">Edge</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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12</td><td class="bc-supports-yes bc-browser-firefox bc-has-history"><span class="bc-browser-name">Firefox</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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36<div class="bc-icons"></div><section class="bc-history" id="sect1"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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36<div class="bc-icons"></div></dt><dd></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>27 — 36<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="Uses the non-standard name: <code>@@iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> A placeholder property named <code>@@iterator</code> is used.</dd><dd><abbr class="only-icon" title="Uses the non-standard name: <code>@@iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> Uses the non-standard name: <code>@@iterator</code></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>17 — 27<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="Uses the non-standard name: <code>iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> A placeholder property named <code>iterator</code> is used.</dd><dd><abbr class="only-icon" title="Uses the non-standard name: <code>iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> Uses the non-standard name: <code>iterator</code></dd></dl></section></td><td class="bc-supports-no bc-browser-ie"><span class="bc-browser-name">IE</span><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>
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No</td><td class="bc-supports-yes bc-browser-opera"><span class="bc-browser-name">Opera</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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25</td><td class="bc-supports-yes bc-browser-safari"><span class="bc-browser-name">Safari</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-webview_android"><span class="bc-browser-name">WebView Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-chrome_android"><span class="bc-browser-name">Chrome Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-unknown bc-browser-edge_mobile"><span class="bc-browser-name">Edge Mobile</span><abbr title="Compatibility unknown; please update this.">
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?
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</abbr></td><td class="bc-supports-yes bc-browser-firefox_android bc-has-history"><span class="bc-browser-name">Firefox Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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36<div class="bc-icons"></div><section class="bc-history" id="sect2"><dl><dt class="bc-supports-yes bc-supports"><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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36<div class="bc-icons"></div></dt><dd></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>27 — 36<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="Uses the non-standard name: <code>@@iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> A placeholder property named <code>@@iterator</code> is used.</dd><dd><abbr class="only-icon" title="Uses the non-standard name: <code>@@iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> Uses the non-standard name: <code>@@iterator</code></dd><dt class="bc-supports-no bc-supports"><abbr class="bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr>17 — 27<div class="bc-icons"><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> <abbr class="only-icon" title="Uses the non-standard name: <code>iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> </div></dt><dd><abbr class="only-icon" title="See implementation notes"><span>Notes</span><i class="ic-footnote"></i></abbr> A placeholder property named <code>iterator</code> is used.</dd><dd><abbr class="only-icon" title="Uses the non-standard name: <code>iterator</code>"><span>Alternate Name</span><i class="ic-altname"></i></abbr> Uses the non-standard name: <code>iterator</code></dd></dl></section></td><td class="bc-supports-yes bc-browser-opera_android"><span class="bc-browser-name">Opera Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-safari_ios"><span class="bc-browser-name">Safari iOS</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-samsunginternet_android"><span class="bc-browser-name">Samsung Internet Android</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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Yes</td><td class="bc-supports-yes bc-browser-nodejs"><span class="bc-browser-name">nodejs</span><abbr class="bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr>
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0.12</td></tr></tbody></table><section class="bc-legend" id="sect3"><h3 class="offscreen" id="Legend">Legend</h3><dl><dt><span class="bc-supports-yes bc-supports">
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<abbr class="bc-level bc-level-yes only-icon" title="Full support">
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<span>Full support</span>
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</abbr></span></dt><dd>Full support</dd><dt><span class="bc-supports-no bc-supports">
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<abbr class="bc-level bc-level-no only-icon" title="No support">
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<span>No support</span>
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</abbr></span></dt><dd>No support</dd><dt><span class="bc-supports-unknown bc-supports">
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<abbr class="bc-level bc-level-unknown only-icon" title="Compatibility unknown">
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<span>Compatibility unknown</span>
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</abbr></span></dt><dd>Compatibility unknown</dd><dt><abbr class="only-icon" title="See implementation notes."><span>See implementation notes.</span><i class="ic-footnote"></i></abbr></dt><dd>See implementation notes.</dd><dt><abbr class="only-icon" title="Uses a non-standard name."><span>Uses a non-standard name.</span><i class="ic-altname"></i></abbr></dt><dd>Uses a non-standard name.</dd></dl></section></div><p></p>
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</div>
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<h2 id="相关链接">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/Array/keys" title="keys() 方法返回一个包含数组中每个索引键的Array Iterator对象。"><code>Array.prototype.keys()</code></a></li>
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<li><a href="Reference/Global_Objects/Array/entries" title="entries() 方法返回一个新的Array Iterator对象，该对象包含数组中每个索引的键/值对。"><code>Array.prototype.entries()</code></a></li>
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<li><a href="Reference/Global_Objects/Array/forEach" title="forEach() 方法对数组的每个元素执行一次提供的函数。"><code>Array.prototype.forEach()</code></a></li>
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<li><a href="Reference/Global_Objects/Array/every" title="every() 方法测试数组的所有元素是否都通过了指定函数的测试。"><code>Array.prototype.every()</code></a></li>
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<li><a href="Reference/Global_Objects/Array/some" title="some() 方法测试是否至少有一个元素通过由提供的函数实现的测试。"><code>Array.prototype.some()</code></a></li>
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<li><a href="Reference/Global_Objects/Array/values" title="values() 方法返回一个新的 Array Iterator 对象，该对象包含数组每个索引的值"><code>Array.prototype.values()</code></a></li>
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</ul>
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</article> |