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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
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+---
+title: Array.prototype.join()
+slug: Web/JavaScript/Reference/Global_Objects/Array/join
+tags:
+ - Array
+ - JavaScript
+ - Method
+ - Prototype
+ - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Array/join
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>join()</strong></code> 方法會將陣列(或一個<a href="/zh-TW/docs/Web/JavaScript/Guide/Indexed_collections#Working_with_array-like_objects">類陣列(array-like)物件</a>)中所有的元素連接、合併成一個字串,並回傳此字串。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/array-join.html")}}</div>
+
+
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox"><var>arr</var>.join(<em>[</em><var>separator]</var>)</pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>separator</code> {{optional_inline}}</dt>
+ <dd>用來隔開陣列中每個元素的字串。如果必要的話,separator 會自動被轉成字串型態。如果未傳入此參數,陣列中的元素將預設用英文逗號(「,」)隔開。如果 <code>separator</code> 是空字串,合併後,元素間不會有任何字元。</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>一個合併所有陣列元素的字串。假如 <code><em>arr</em>.length</code> 為 <code>0</code>,將回傳空字串。</p>
+
+<h2 id="描述">描述</h2>
+
+<p>將所有陣列中的元素轉成字串型態後,連接合併成一個字串。任何 <code>undefined</code> 或 <code>null</code> 的元素都會被視為空字串處理。</p>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="舉例四種合併用法">舉例四種合併用法</h3>
+
+<p>下方的範例中,首先宣告一個陣列—<code>a</code>,其中有三個元素。接著分別用:預設值、逗號、加號和空字串將陣列連接。</p>
+
+<pre class="brush: js">var a = ['Wind', 'Rain', 'Fire'];
+a.join(); // 'Wind,Rain,Fire'
+a.join(', '); // 'Wind, Rain, Fire'
+a.join(' + '); // 'Wind + Rain + Fire'
+a.join(''); // 'WindRainFire'</pre>
+
+<h3 id="合併一個類陣列(array-like)物件">合併一個類陣列(array-like)物件</h3>
+
+<p>下方的範例將合併一個類陣列(array-like)物件(<code><a href="/zh-TW/docs/Web/JavaScript/Reference/Functions/arguments">arguments</a></code>),藉由 {{jsxref("Function.prototype.call")}} 來呼叫 <code>Array.prototype.join</code>。</p>
+
+<pre class="brush: js">function f(a, b, c) {
+ var s = Array.prototype.join.call(arguments);
+ console.log(s); // '<span class="message-body-wrapper"><span class="message-flex-body"><span class="devtools-monospace message-body"><span class="objectBox objectBox-string">1,a,true'</span></span></span></span>
+}
+f(1, 'a', true);
+//expected output: "1,a,true"
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">規範</th>
+ <th scope="col">狀態</th>
+ <th scope="col">註解</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>Initial definition. Implemented in JavaScript 1.1.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES5.1', '#sec-15.4.4.5', 'Array.prototype.join')}}</td>
+ <td>{{Spec2('ES5.1')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES6', '#sec-array.prototype.join', 'Array.prototype.join')}}</td>
+ <td>{{Spec2('ES6')}}</td>
+ <td> </td>
+ </tr>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-array.prototype.join', 'Array.prototype.join')}}</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.join")}}</p>
+</div>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.split()")}}</li>
+ <li>{{jsxref("Array.prototype.toString()")}}</li>
+ <li>{{jsxref("TypedArray.prototype.join()")}}</li>
+</ul>