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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
commit | 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 (patch) | |
tree | a9ef8ac1e1b8fe4207b6d64d3841bfb8990b6fd0 /files/zh-tw/web/javascript/reference/global_objects/array/of | |
parent | 074785cea106179cb3305637055ab0a009ca74f2 (diff) | |
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diff --git a/files/zh-tw/web/javascript/reference/global_objects/array/of/index.html b/files/zh-tw/web/javascript/reference/global_objects/array/of/index.html new file mode 100644 index 0000000000..31118bbeb6 --- /dev/null +++ b/files/zh-tw/web/javascript/reference/global_objects/array/of/index.html @@ -0,0 +1,98 @@ +--- +title: Array.of() +slug: Web/JavaScript/Reference/Global_Objects/Array/of +tags: + - Array + - ECMAScript 2015 + - JavaScript + - Method + - polyfill +translation_of: Web/JavaScript/Reference/Global_Objects/Array/of +--- +<div>{{JSRef}}</div> + +<p><code><strong>Array.of()</strong></code> 方法會由引數(arguments)的數量來建立一個新的 <code>Array</code> 實體,而不管引數的數量或類型為何。</p> + +<p><code><strong>Array.of()</strong></code> 與 <code><strong>Array</strong></code> 建構式之間的不同在於如何處理整數引數:<code><strong>Array.of(7)</strong></code> 會建立一個擁有單個元素—<code>7</code>—的陣列,而 <code><strong>Array(7)</strong></code> 會建立一個 <code>length</code> 屬性值為 7 的空陣列(<strong>註:</strong>這意味著這個陣列有 7 個空缺欄位(empty slots),而非 7 個值為 <code>undefined</code> 的欄位)。</p> + +<pre class="brush: js">Array.of(7); // [7] +Array.of(1, 2, 3); // [1, 2, 3] + +Array(7); // [ , , , , , , ] +Array(1, 2, 3); // [1, 2, 3] +</pre> + +<h2 id="語法">語法</h2> + +<pre class="syntaxbox">Array.of(<var>element0</var>[, <var>element1</var>[, ...[, <var>elementN</var>]]])</pre> + +<h3 id="參數">參數</h3> + +<dl> + <dt><code>element<em>N</em></code></dt> + <dd>要用來成為新建立之陣列的元素。</dd> +</dl> + +<h3 id="回傳值">回傳值</h3> + +<p>一個新的 {{jsxref("Array")}} 實體。</p> + +<h2 id="描述">描述</h2> + +<p>此函式是 ECMAScript 2015 標準的一部分。更多資訊可參考 <a href="https://gist.github.com/rwaldron/1074126"><code>Array.of</code> and <code>Array.from</code> proposal</a> 以及 <a href="https://gist.github.com/rwaldron/3186576"><code>Array.of</code> polyfill</a>。</p> + +<h2 id="範例">範例</h2> + +<pre class="brush: js">Array.of(1); // [1] +Array.of(1, 2, 3); // [1, 2, 3] +Array.of(undefined); // [undefined] +</pre> + +<h2 id="Polyfill">Polyfill</h2> + +<p>若所有執行環境沒有原生支援,可以在其他程式之前先執行以下程式碼來建立 <code>Array.of()</code>。</p> + +<pre class="brush: js">if (!Array.of) { + Array.of = function() { + return Array.prototype.slice.call(arguments); + }; +} +</pre> + +<h2 id="規範">規範</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-array.of', 'Array.of')}}</td> + <td>{{Spec2('ES2015')}}</td> + <td>Initial definition.</td> + </tr> + <tr> + <td>{{SpecName('ESDraft', '#sec-array.of', 'Array.of')}}</td> + <td>{{Spec2('ESDraft')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="瀏覽器相容性">瀏覽器相容性</h2> + +<div> + + +<p>{{Compat("javascript.builtins.Array.of")}}</p> +</div> + +<h2 id="參見">參見</h2> + +<ul> + <li>{{jsxref("Array")}}</li> + <li>{{jsxref("Array.from()")}}</li> + <li>{{jsxref("TypedArray.of()")}}</li> +</ul> |