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+---
+title: handler.construct()
+slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler/construct
+translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/construct
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>handler.construct()</strong></code> 方法用于拦截{{jsxref("Operators/new", "new")}} 操作符. 为了使new操作符在生成的Proxy对象上生效，用于初始化代理的目标对象自身必须具有[[Construct]]内部方法（即 <code>new target</code> 必须是有效的）。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/proxyhandler-construct.html", "taller")}}</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var p = new Proxy(target, {
+  construct: function(target, argumentsList, newTarget) {
+  }
+});
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>下面的参数将会传递给<code>construct</code>方法，<code>this</code>绑定在handler上。</p>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>目标对象。</dd>
+ <dt><code>argumentsList</code></dt>
+ <dd>constructor的参数列表。</dd>
+ <dt><code>newTarget</code></dt>
+ <dd>最初被调用的构造函数，就上面的例子而言是p。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>construct</code> 方法必须返回一个对象。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code><strong>handler.construct()</strong></code> 方法用于拦截 {{jsxref("Operators/new", "new")}}操作符。</p>
+
+<h3 id="拦截">拦截</h3>
+
+<p>该拦截器可以拦截以下操作:</p>
+
+<ul>
+ <li><code>new proxy(...args)</code></li>
+ <li>{{jsxref("Reflect.construct()")}}</li>
+</ul>
+
+<h3 id="约束">约束</h3>
+
+<p>如果违反以下约定，代理将会抛出错误 {{jsxref("TypeError")}}:</p>
+
+<ul>
+ <li>必须返回一个对象.</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<p>下面代码演示如何拦截 {{jsxref("Operators/new", "new")}} 操作。</p>
+
+<pre class="brush: js">var p = new Proxy(function() {}, {
+  construct: function(target, argumentsList, newTarget) {
+    console.log('called: ' + argumentsList.join(', '));
+    return { value: argumentsList[0] * 10 };
+  }
+});
+
+console.log(new p(1).value); // "called: 1"
+                             // 10
+</pre>
+
+<p>下面的代码违反了约定.</p>
+
+<pre class="brush: js">var p = new Proxy(function() {}, {
+  construct: function(target, argumentsList, newTarget) {
+    return 1;
+  }
+});
+
+new p(); // TypeError is thrown
+</pre>
+
+<p>下面的代码未能正确的初始化Proxy。Proxy初始化时，传给它的<code>target</code> 必须具有一个有效的constructor供<code>new</code>操作符调用。</p>
+
+<pre class="brush: js">var p = new Proxy({}, {
+  construct: function(target, argumentsList, newTarget) {
+    return {};
+  }
+});
+
+new p(); // TypeError is thrown, "p" is not a constructor
+</pre>
+
+<h2 id="规范">规范</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-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget', '[[Construct]]')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget', '[[Construct]]')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{Compat("javascript.builtins.Proxy.handler.construct")}}</div>
+
+<div id="compat-mobile"> </div>
+
+<h2 id="相关主题">相关主题</h2>
+
+<ul>
+ <li>{{jsxref("Proxy")}}</li>
+ <li>{{jsxref("Proxy.handler", "handler")}}</li>
+ <li>{{jsxref("Operators/new", "new")}} operator.</li>
+ <li>{{jsxref("Reflect.construct()")}}</li>
+</ul>