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+---
+title: Object.prototype.hasOwnProperty()
+slug: Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
+tags:
+  - JavaScript
+translation_of: Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>hasOwnProperty()</strong></code> 回傳物件是否有該屬性的布林值。</p>
+
+<h2 id="表達式">表達式</h2>
+
+<pre class="syntaxbox"><code><var>obj</var>.hasOwnProperty(<var>prop</var>)</code></pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>prop</code></dt>
+ <dd>屬性名稱。</dd>
+</dl>
+
+<h2 id="說明">說明</h2>
+
+<p>每個為 {{jsxref("Object")}} 後代的物件都繼承 <code>hasOwnProperty</code> 方法。這個方法可以被使用來決定物件是否擁有特定的直接屬性；跟 {{jsxref("Operators/in", "in")}} 不一樣，這個方法並未檢查物件的原型鏈。</p>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="使用_hasOwnProperty_測試屬性是否存在">使用 <code>hasOwnProperty</code> 測試屬性是否存在</h3>
+
+<p>這個範例顯示 <code>o </code>物件是否擁有名為 <code>prop </code>的屬性:</p>
+
+<pre class="brush: js">o = new Object();
+o.prop = 'exists';
+
+function changeO() {
+  o.newprop = o.prop;
+  delete o.prop;
+}
+
+o.hasOwnProperty('prop');   // 回傳 true
+changeO();
+o.hasOwnProperty('prop');   // 回傳 false
+</pre>
+
+<h3 id="直接與繼承的屬性">直接與繼承的屬性</h3>
+
+<p>這個範例區分直接屬性和從原型鍊繼承的屬性：</p>
+
+<pre class="brush: js">o = new Object();
+o.prop = 'exists';
+o.hasOwnProperty('prop');             // 回傳 true
+o.hasOwnProperty('toString');         // 回傳 false
+o.hasOwnProperty('hasOwnProperty');   // 回傳 false
+</pre>
+
+<h3 id="遍歷物件的屬性">遍歷物件的屬性</h3>
+
+<p>這個範例顯示如何不執行繼承的屬性去遍歷物件的屬性。注意 {{jsxref("Statements/for...in", "for...in")}} 已經遍歷了可以被列舉的項目，所以不該基於缺乏不可列舉的屬性(如下)而假設 <code>hasOwnProperty</code> 被嚴格地限制在列舉的項目（如同 {{jsxref("Object.getOwnPropertyNames()")}}）。</p>
+
+<pre class="brush: js">var buz = {
+  fog: 'stack'
+};
+
+for (var name in buz) {
+  if (buz.hasOwnProperty(name)) {
+    console.log('this is fog (' + name + ') for sure. Value: ' + buz[name]);
+  }
+  else {
+    console.log(name); // toString or something else
+  }
+}
+</pre>
+
+<h3 id="將_hasOwnProperty_作為屬性"><code>將 hasOwnProperty</code> 作為屬性</h3>
+
+<p>JavaScript 並未保護 <code>hasOwnProperty</code>；因此，如果一個物件擁有一樣的屬性名稱，為了獲得正確的結果需要使用 <em>external</em> <code>hasOwnProperty</code>：</p>
+
+<pre class="brush: js">var foo = {
+  hasOwnProperty: function() {
+    return false;
+  },
+  bar: 'Here be dragons'
+};
+
+foo.hasOwnProperty('bar'); // 總是回傳 false
+
+// 使用其他物件的 hasOwnProperty 和 call it with 'this' set to foo
+({}).hasOwnProperty.call(foo, 'bar'); // true
+
+// 從物件的原型使用 hasOwnProperty 也是可行的
+Object.prototype.hasOwnProperty.call(foo, 'bar'); // true
+</pre>
+
+<p>註：在最後一個例子中並未創建任何新的物件。</p>
+
+<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</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES3')}}</td>
+   <td>{{Spec2('ES3')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.5.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.2.4.5', 'Object.prototype.hasOwnProperty')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-object.prototype.hasownproperty', 'Object.prototype.hasOwnProperty')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
+ <li>{{jsxref("Object.getOwnPropertyNames()")}}</li>
+ <li>{{jsxref("Statements/for...in", "for...in")}}</li>
+ <li>{{jsxref("Operators/in", "in")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Inheritance_Revisited">JavaScript Guide: Inheritance revisited</a></li>
+</ul>