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+---
+title: Object.defineProperties()
+slug: Web/JavaScript/Reference/Global_Objects/Object/defineProperties
+translation_of: Web/JavaScript/Reference/Global_Objects/Object/defineProperties
+---
+<div>{{JSRef}}</div>
+
+<p>Phương thức <code><strong>Object.defineProperties()</strong></code> định nghĩa hoặc thay đổi tức thì các thuộc tính của một đối tượng, sau đó trả lại đối tượng đó.</p>
+
+<h2 id="Cú_pháp">Cú pháp</h2>
+
+<pre class="syntaxbox"><code>Object.defineProperties(<var>obj</var>, <var>props</var>)</code></pre>
+
+<h3 id="Các_tham_số">Các tham số</h3>
+
+<dl>
+ <dt><code>obj</code></dt>
+ <dd>Đối tượng được định nghĩa hoặc thay đổi các thuộc tính.</dd>
+ <dt><code>props</code></dt>
+ <dd>Đối tượng mà các thuộc tính có thể liệt kê (enumerable) của riêng nó sẽ cấu thành các bộ mô tả (descriptor) cho các thuộc tính được định nghĩa hoặc sửa đổi. Các bộ mô tả thuộc tính (property descriptors) có trong các đối tượng bao gồm hai loại chính: các bộ mô tả dữ liệu (data descriptors) và các bộ mô tả truy cập (accessor descriptors) (xem {{jsxref("Object.defineProperty()")}} để biết thêm chi tiết). Các bộ mô tả bao gồm các khóa sau:</dd>
+ <dd>
+ <dl>
+  <dt><code>configurable</code></dt>
+  <dd><code>true</code> if and only if the type of this property descriptor may be changed and if the property may be deleted from the corresponding object.<br>
+  <strong>Defaults to <code>false</code>.</strong></dd>
+  <dt><code>enumerable</code></dt>
+  <dd><code>true</code> if and only if this property shows up during enumeration of the properties on the corresponding object.<br>
+  <strong>Defaults to <code>false</code>.</strong></dd>
+ </dl>
+
+ <dl>
+  <dt><code>value</code></dt>
+  <dd>The value associated with the property. Can be any valid JavaScript value (number, object, function, etc).<br>
+  <strong>Defaults to {{jsxref("undefined")}}.</strong></dd>
+  <dt><code>writable</code></dt>
+  <dd><code>true</code> if and only if the value associated with the property may be changed with an {{jsxref("Operators/Assignment_Operators", "assignment operator", "", 1)}}.<br>
+  <strong>Defaults to <code>false</code>.</strong></dd>
+ </dl>
+
+ <dl>
+  <dt><code>get</code></dt>
+  <dd>A function which serves as a getter for the property, or {{jsxref("undefined")}} if there is no getter. The function return will be used as the value of property.<br>
+  <strong>Defaults to {{jsxref("undefined")}}.</strong></dd>
+  <dt><code>set</code></dt>
+  <dd>A function which serves as a setter for the property, or {{jsxref("undefined")}} if there is no setter. The function will receive as only argument the new value being assigned to the property.<br>
+  <strong>Defaults to {{jsxref("undefined")}}.</strong></dd>
+ </dl>
+ </dd>
+</dl>
+
+<h3 id="Giá_trị_trả_về">Giá trị trả về</h3>
+
+<p>Đối tượng được truyền khi gọi phương thức.</p>
+
+<h2 id="Mô_tả">Mô tả</h2>
+
+<p><code>Object.defineProperties</code>, in essence, defines all properties corresponding to the enumerable own properties of <code>props</code> on the object <code>obj</code> object.</p>
+
+<h2 id="Ví_dụ">Ví dụ</h2>
+
+<pre class="brush: js">var obj = {};
+Object.defineProperties(obj, {
+  'property1': {
+    value: true,
+    writable: true
+  },
+  'property2': {
+    value: 'Hello',
+    writable: false
+  }
+  // etc. etc.
+});
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>Assuming a pristine execution environment with all names and properties referring to their initial values, <code>Object.defineProperties</code> is almost completely equivalent (note the comment in <code>isCallable</code>) to the following reimplementation in JavaScript:</p>
+
+<pre class="brush: js;highlight:[8]">function defineProperties(obj, properties) {
+  function convertToDescriptor(desc) {
+    function hasProperty(obj, prop) {
+      return Object.prototype.hasOwnProperty.call(obj, prop);
+    }
+
+    function isCallable(v) {
+      // NB: modify as necessary if other values than functions are callable.
+      return typeof v === 'function';
+    }
+
+    if (typeof desc !== 'object' || desc === null)
+      throw new TypeError('bad desc');
+
+    var d = {};
+
+    if (hasProperty(desc, 'enumerable'))
+      d.enumerable = !!desc.enumerable;
+    if (hasProperty(desc, 'configurable'))
+      d.configurable = !!desc.configurable;
+    if (hasProperty(desc, 'value'))
+      d.value = desc.value;
+    if (hasProperty(desc, 'writable'))
+      d.writable = !!desc.writable;
+    if (hasProperty(desc, 'get')) {
+      var g = desc.get;
+
+      if (!isCallable(g) &amp;&amp; typeof g !== 'undefined')
+        throw new TypeError('bad get');
+      d.get = g;
+    }
+    if (hasProperty(desc, 'set')) {
+      var s = desc.set;
+      if (!isCallable(s) &amp;&amp; typeof s !== 'undefined')
+        throw new TypeError('bad set');
+      d.set = s;
+    }
+
+    if (('get' in d || 'set' in d) &amp;&amp; ('value' in d || 'writable' in d))
+      throw new TypeError('identity-confused descriptor');
+
+    return d;
+  }
+
+  if (typeof obj !== 'object' || obj === null)
+    throw new TypeError('bad obj');
+
+  properties = Object(properties);
+
+  var keys = Object.keys(properties);
+  var descs = [];
+
+  for (var i = 0; i &lt; keys.length; i++)
+    descs.push([keys[i], convertToDescriptor(properties[keys[i]])]);
+
+  for (var i = 0; i &lt; descs.length; i++)
+    Object.defineProperty(obj, descs[i][0], descs[i][1]);
+
+  return obj;
+}
+</pre>
+
+<h2 id="Đặc_tả">Đặc tả</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('ES5.1', '#sec-15.2.3.7', 'Object.defineProperties')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.8.5</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-object.defineproperties', 'Object.defineProperties')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-object.defineproperties', 'Object.defineProperties')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Tương_thích_trình_duyệt">Tương thích trình duyệt</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Firefox (Gecko)</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatGeckoDesktop("2")}}</td>
+   <td>{{CompatChrome("5")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatIE("9")}}</td>
+   <td>{{CompatOpera("11.60")}}</td>
+   <td>{{CompatSafari("5")}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatGeckoMobile("2")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatOperaMobile("11.5")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Tham_khảo">Tham khảo</h2>
+
+<ul>
+ <li>{{jsxref("Object.defineProperty()")}}</li>
+ <li>{{jsxref("Object.keys()")}}</li>
+ <li><a href="/en-US/docs/Enumerability_and_ownership_of_properties">Enumerability and ownership of properties</a></li>
+</ul>