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----
-title: Проксі
-slug: Web/JavaScript/Reference/Global_Objects/Proxy
-translation_of: Web/JavaScript/Reference/Global_Objects/Proxy
----
-<div>
-<div>{{JSRef}}</div>
-</div>
-
-<p><strong>Proxy</strong> об'єкт використовується для визначення власної поведінки для базових операцій (наприклад, доступ до властивостей, присвоєння, обрахунок, виклик функцій та ін.).</p>
-
-<h2 id="Terminology">Terminology</h2>
-
-<dl>
- <dt><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler">handler</a></dt>
- <dd>Placeholder object which contains traps.</dd>
- <dt>traps</dt>
- <dd>The methods that provide property access. This is analogous to the concept of traps in operating systems.</dd>
- <dt>target</dt>
- <dd>Object which the proxy virtualizes. It is often used as storage backend for the proxy. Invariants (semantics that remain unchanged) regarding object non-extensibility or non-configurable properties are verified against the target.</dd>
-</dl>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="syntaxbox">var p = new Proxy(target, handler);
-</pre>
-
-<h3 id="Parameters">Parameters</h3>
-
-<dl>
- <dt><code>target</code></dt>
- <dd>A target object (can be any sort of object, including a native array, a function or even another proxy) to wrap with <code>Proxy</code>.</dd>
- <dt><code>handler</code></dt>
- <dd>An object whose properties are functions which define the behavior of the proxy when an operation is performed on it.</dd>
-</dl>
-
-<h2 id="Methods">Methods</h2>
-
-<dl>
- <dt>{{jsxref("Proxy.revocable()")}}</dt>
- <dd>Creates a revocable <code>Proxy</code> object.</dd>
-</dl>
-
-<h2 id="Methods_of_the_handler_object">Methods of the handler object</h2>
-
-<p>The handler object is a placeholder object which contains traps for <code>Proxy</code>.</p>
-
-<div>{{page('/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler', 'Methods') }}</div>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Basic_example">Basic example</h3>
-
-<p>In this simple example the number <code>37</code> gets returned as the default value when the property name is not in the object. It is using the <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/get"><code>get</code></a> handler.</p>
-
-<pre class="brush: js">var handler = {
-    get: function(target, name) {
-        return name in target ?
-            target[name] :
-            37;
-    }
-};
-
-var p = new Proxy({}, handler);
-p.a = 1;
-p.b = undefined;
-
-console.log(p.a, p.b); // 1, undefined
-console.log('c' in p, p.c); // false, 37
-</pre>
-
-<h3 id="No-op_forwarding_proxy">No-op forwarding proxy</h3>
-
-<p>In this example, we are using a native JavaScript object to which our proxy will forward all operations that are applied to it.</p>
-
-<pre class="brush: js">var target = {};
-var p = new Proxy(target, {});
-
-p.a = 37; // operation forwarded to the target
-
-console.log(target.a); // 37. The operation has been properly forwarded
-</pre>
-
-<h3 id="Validation">Validation</h3>
-
-<p>With a <code>Proxy</code>, you can easily validate the passed value for an object. This example uses the <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set"><code>set</code></a> handler.</p>
-
-<pre class="brush: js">let validator = {
-  set: function(obj, prop, value) {
-    if (prop === 'age') {
-      if (!Number.isInteger(value)) {
-        throw new TypeError('The age is not an integer');
-      }
-      if (value &gt; 200) {
-        throw new RangeError('The age seems invalid');
-      }
-    }
-
-    // The default behavior to store the value
-    obj[prop] = value;
-
-    // Indicate success
-    return true;
-  }
-};
-
-let person = new Proxy({}, validator);
-
-person.age = 100;
-console.log(person.age); // 100
-person.age = 'young'; // Throws an exception
-person.age = 300; // Throws an exception</pre>
-
-<h3 id="Extending_constructor">Extending constructor</h3>
-
-<p>A function proxy could easily extend a constructor with a new constructor. This example uses the <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/construct"><code>construct</code></a> and <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply"><code>apply</code></a> handlers.</p>
-
-<pre class="brush: js">function extend(sup, base) {
-  var descriptor = Object.getOwnPropertyDescriptor(
-    base.prototype, 'constructor'
-  );
-  base.prototype = Object.create(sup.prototype);
-  var handler = {
-    construct: function(target, args) {
-      var obj = Object.create(base.prototype);
-      this.apply(target, obj, args);
-      return obj;
-    },
-    apply: function(target, that, args) {
-      sup.apply(that, args);
-      base.apply(that, args);
-    }
-  };
-  var proxy = new Proxy(base, handler);
-  descriptor.value = proxy;
-  Object.defineProperty(base.prototype, 'constructor', descriptor);
-  return proxy;
-}
-
-var Person = function(name) {
-  this.name = name;
-};
-
-var Boy = extend(Person, function(name, age) {
-  this.age = age;
-});
-
-Boy.prototype.sex = 'M';
-
-var Peter = new Boy('Peter', 13);
-console.log(Peter.sex);  // "M"
-console.log(Peter.name); // "Peter"
-console.log(Peter.age);  // 13</pre>
-
-<h3 id="Manipulating_DOM_nodes">Manipulating DOM nodes</h3>
-
-<p>Sometimes you want to toggle the attribute or class name of two different elements. Here's how using the <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set"><code>set</code></a> handler.</p>
-
-<pre class="brush: js">let view = new Proxy({
-  selected: null
-},
-{
-  set: function(obj, prop, newval) {
-    let oldval = obj[prop];
-
-    if (prop === 'selected') {
-      if (oldval) {
-        oldval.setAttribute('aria-selected', 'false');
-      }
-      if (newval) {
-        newval.setAttribute('aria-selected', 'true');
-      }
-    }
-
-    // The default behavior to store the value
-    obj[prop] = newval;
-
-    // Indicate success
-    return true;
-  }
-});
-
-let i1 = view.selected = document.getElementById('item-1');
-console.log(i1.getAttribute('aria-selected')); // 'true'
-
-let i2 = view.selected = document.getElementById('item-2');
-console.log(i1.getAttribute('aria-selected')); // 'false'
-console.log(i2.getAttribute('aria-selected')); // 'true'</pre>
-
-<h3 id="Value_correction_and_an_extra_property">Value correction and an extra property</h3>
-
-<p>The <code>products</code> proxy object evaluates the passed value and converts it to an array if needed. The object also supports an extra property called <code>latestBrowser</code> both as a getter and a setter.</p>
-
-<pre class="brush: js">let products = new Proxy({
-  browsers: ['Internet Explorer', 'Netscape']
-},
-{
-  get: function(obj, prop) {
-    // An extra property
-    if (prop === 'latestBrowser') {
-      return obj.browsers[obj.browsers.length - 1];
-    }
-
-    // The default behavior to return the value
-    return obj[prop];
-  },
-  set: function(obj, prop, value) {
-    // An extra property
-    if (prop === 'latestBrowser') {
-      obj.browsers.push(value);
-      return true;
-    }
-
-    // Convert the value if it is not an array
-    if (typeof value === 'string') {
-      value = [value];
-    }
-
-    // The default behavior to store the value
-    obj[prop] = value;
-
-    // Indicate success
-    return true;
-  }
-});
-
-console.log(products.browsers); // ['Internet Explorer', 'Netscape']
-products.browsers = 'Firefox'; // pass a string (by mistake)
-console.log(products.browsers); // ['Firefox'] &lt;- no problem, the value is an array
-
-products.latestBrowser = 'Chrome';
-console.log(products.browsers); // ['Firefox', 'Chrome']
-console.log(products.latestBrowser); // 'Chrome'</pre>
-
-<h3 id="Finding_an_array_item_object_by_its_property">Finding an array item object by its property</h3>
-
-<p>This proxy extends an array with some utility features. As you see, you can flexibly "define" properties without using <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties"><code>Object.defineProperties</code></a>. This example can be adapted to find a table row by its cell. In that case, the target will be <a href="/en-US/docs/DOM/table.rows"><code>table.rows</code></a>.</p>
-
-<pre class="brush: js">let products = new Proxy([
-  { name: 'Firefox', type: 'browser' },
-  { name: 'SeaMonkey', type: 'browser' },
-  { name: 'Thunderbird', type: 'mailer' }
-],
-{
-  get: function(obj, prop) {
-    // The default behavior to return the value; prop is usually an integer
-    if (prop in obj) {
-      return obj[prop];
-    }
-
-    // Get the number of products; an alias of products.length
-    if (prop === 'number') {
-      return obj.length;
-    }
-
-    let result, types = {};
-
-    for (let product of obj) {
-      if (product.name === prop) {
-        result = product;
-      }
-      if (types[product.type]) {
-        types[product.type].push(product);
-      } else {
-        types[product.type] = [product];
-      }
-    }
-
-    // Get a product by name
-    if (result) {
-      return result;
-    }
-
-    // Get products by type
-    if (prop in types) {
-      return types[prop];
-    }
-
-    // Get product types
-    if (prop === 'types') {
-      return Object.keys(types);
-    }
-
-    return undefined;
-  }
-});
-
-console.log(products[0]); // { name: 'Firefox', type: 'browser' }
-console.log(products['Firefox']); // { name: 'Firefox', type: 'browser' }
-console.log(products['Chrome']); // undefined
-console.log(products.browser); // [{ name: 'Firefox', type: 'browser' }, { name: 'SeaMonkey', type: 'browser' }]
-console.log(products.types); // ['browser', 'mailer']
-console.log(products.number); // 3
-</pre>
-
-<h3 id="A_complete_traps_list_example">A complete <code>traps</code> list example</h3>
-
-<p>Now in order to create a complete sample <code>traps</code> list, for didactic purposes, we will try to proxify a <em>non native</em> object that is particularly suited to this type of operation: the <code>docCookies</code> global object created by <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie/Simple_document.cookie_framework" title="https://developer.mozilla.org/en-US/docs/DOM/document.cookie#A_little_framework.3A_a_complete_cookies_reader.2Fwriter_with_full_unicode_support">the "little framework" published on the <code>document.cookie</code> page</a>.</p>
-
-<pre class="brush: js">/*
-  var docCookies = ... get the "docCookies" object here:
-  https://developer.mozilla.org/en-US/docs/DOM/document.cookie#A_little_framework.3A_a_complete_cookies_reader.2Fwriter_with_full_unicode_support
-*/
-
-var docCookies = new Proxy(docCookies, {
-  get: function (oTarget, sKey) {
-    return oTarget[sKey] || oTarget.getItem(sKey) || undefined;
-  },
-  set: function (oTarget, sKey, vValue) {
-    if (sKey in oTarget) { return false; }
-    return oTarget.setItem(sKey, vValue);
-  },
-  deleteProperty: function (oTarget, sKey) {
-    if (sKey in oTarget) { return false; }
-    return oTarget.removeItem(sKey);
-  },
-  enumerate: function (oTarget, sKey) {
-    return oTarget.keys();
-  },
-  ownKeys: function (oTarget, sKey) {
-    return oTarget.keys();
-  },
-  has: function (oTarget, sKey) {
-    return sKey in oTarget || oTarget.hasItem(sKey);
-  },
-  defineProperty: function (oTarget, sKey, oDesc) {
-    if (oDesc &amp;&amp; 'value' in oDesc) { oTarget.setItem(sKey, oDesc.value); }
-    return oTarget;
-  },
-  getOwnPropertyDescriptor: function (oTarget, sKey) {
-    var vValue = oTarget.getItem(sKey);
-    return vValue ? {
-      value: vValue,
-      writable: true,
-      enumerable: true,
-      configurable: false
-    } : undefined;
-  },
-});
-
-/* Cookies test */
-
-console.log(docCookies.my_cookie1 = 'First value');
-console.log(docCookies.getItem('my_cookie1'));
-
-docCookies.setItem('my_cookie1', 'Changed value');
-console.log(docCookies.my_cookie1);</pre>
-
-<h2 id="Specifications">Specifications</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-proxy-objects', 'Proxy')}}</td>
-   <td>{{Spec2('ES2015')}}</td>
-   <td>Initial definition.</td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES2016', '#sec-proxy-objects', 'Proxy')}}</td>
-   <td>{{Spec2('ES2016')}}</td>
-   <td></td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES2017', '#sec-proxy-objects', 'Proxy')}}</td>
-   <td>{{Spec2('ES2017')}}</td>
-   <td></td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ESDraft', '#sec-proxy-objects', 'Proxy')}}</td>
-   <td>{{Spec2('ESDraft')}}</td>
-   <td></td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("javascript.builtins.Proxy", 2)}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a class="external" href="https://www.youtube.com/watch?v=sClk6aB_CPk">"Proxies are awesome" Brendan Eich presentation at JSConf</a> (<a class="external" href="http://www.slideshare.net/BrendanEich/metaprog-5303821">slides</a>)</li>
- <li><a class="external" href="http://wiki.ecmascript.org/doku.php?id=harmony:proxies">ECMAScript Harmony Proxy proposal page</a> and <a class="external" href="http://wiki.ecmascript.org/doku.php?id=harmony:proxies_semantics">ECMAScript Harmony proxy semantics page</a></li>
- <li><a class="external" href="http://soft.vub.ac.be/~tvcutsem/proxies/">Tutorial on proxies</a></li>
- <li><a href="/en-US/docs/JavaScript/Old_Proxy_API" title="/en-US/docs/JavaScript/Old_Proxy_API">SpiderMonkey specific Old Proxy API</a></li>
- <li>{{jsxref("Object.watch()")}} is a non-standard feature but has been supported in Gecko for a long time.</li>
-</ul>
-
-<h2 id="Licensing_note">Licensing note</h2>
-
-<p>Some content (text, examples) in this page has been copied or adapted from the <a class="external" href="http://wiki.ecmascript.org/doku.php">ECMAScript wiki</a> which content is licensed <a class="external" href="http://creativecommons.org/licenses/by-nc-sa/2.0/">CC 2.0 BY-NC-SA</a>.</p>