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: Function.displayName
+slug: Web/JavaScript/Reference/Global_Objects/Function/displayName
+tags:
+  - Function
+  - JavaScript
+  - Non-standard
+  - Property
+translation_of: Web/JavaScript/Reference/Global_Objects/Function/displayName
+---
+<div>{{JSRef}} {{non-standard_header}}</div>
+
+<p><strong><code><var>function</var>.displayName</code></strong> プロパティは、関数の表示名を返します。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="Setting_a_displayName" name="Setting_a_displayName">displayName の設定</h3>
+
+<p>通常、コンソールやプロファイラーでは関数名を表示するのに {{jsxref("Function.name", "func.name")}} よりも好まれます。</p>
+
+<p>以下のものをコンソールに入力すると、 "<code>function My Function()</code>" のように表示されます。</p>
+
+<pre class="brush: js notranslate">var a = function() {};
+a.displayName = 'My Function';
+
+a; // "function My Function()"</pre>
+
+<p><code>displayName</code> プロパティが定義されると、関数の表示名が返されます。</p>
+
+<pre class="brush: js notranslate">function doSomething() {}
+
+console.log(doSomething.displayName); // "undefined"
+
+var popup = function(content) { console.log(content); };
+
+popup.displayName = 'Show Popup';
+
+console.log(popup.displayName); // "Show Popup"
+</pre>
+
+<h3 id="Defining_a_displayName_in_function_expressions" name="Defining_a_displayName_in_function_expressions">関数式の displayName の定義</h3>
+
+<p>{{jsxref("Functions_and_function_scope", "関数式", "", 1)}}内で、関数と同時に表示名を定義できます。</p>
+
+<pre class="brush: js notranslate">var object = {
+  someMethod: function() {}
+};
+
+object.someMethod.displayName = 'someMethod';
+
+console.log(object.someMethod.displayName); // logs "someMethod"
+
+try { someMethod } catch(e) { console.log(e); }
+// ReferenceError: someMethod is not defined
+</pre>
+
+<h3 id="Changing_displayName_dynamically" name="Changing_displayName_dynamically">動的な displayName の変更</h3>
+
+<p>関数の <code>displayName</code> を動的に変更できます。</p>
+
+<pre class="brush: js notranslate">var object = {
+  // anonymous
+  someMethod: function(value) {
+    arguments.callee.displayName = 'someMethod (' + value + ')';
+  }
+};
+
+console.log(object.someMethod.displayName); // "undefined"
+
+object.someMethod('123')
+console.log(object.someMethod.displayName); // "someMethod (123)"
+</pre>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<p>どの仕様にも含まれていません。</p>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<div>
+<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div>
+
+<p>{{Compat("javascript.builtins.Function.displayName")}}</p>
+</div>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{jsxref("Function.name")}}</li>
+</ul>
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