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+---
+title: Reflect.construct()
+slug: Web/JavaScript/Reference/Global_Objects/Reflect/construct
+translation_of: Web/JavaScript/Reference/Global_Objects/Reflect/construct
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Reflect</strong></code><strong><code>.construct()</code></strong> 方法的行为有点像 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new"><code>new</code> 操作符</a> 构造函数 ， 相当于运行 <code>new target(...args)</code>.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">Reflect.construct(target, argumentsList[, newTarget])
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>被运行的目标构造函数</dd>
+ <dt><code>argumentsList</code></dt>
+ <dd>类数组，目标构造函数调用时的参数。</dd>
+ <dt><code>newTarget</code> {{optional_inline}}</dt>
+ <dd>作为新创建对象的原型对象的<code>constructor</code>属性， 参考 <code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/new.target">new.target</a></code> 操作符，默认值为<code>target。</code></dd>
+</dl>
+
+<h3 id="返回值"><code>返回值</code></h3>
+
+<p>以<code>target</code>（如果<code>newTarget</code>存在，则为<code>newTarget</code>）函数为构造函数，<code>argumentList</code>为其初始化参数的对象实例。</p>
+
+<h3 id="异常">异常</h3>
+
+<p>如果target或者newTarget不是构造函数，抛出{{jsxref("TypeError")}},异常。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>Reflect.construct</code>允许你使用可变的参数来调用构造函数 ，这和使用<a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/new">new操作符</a>搭配<a href="https://developer.mozilla.org/ zh-CN/docs/Web/JavaScript/Reference/Operators/new">对象展开符</a>调用一样。</p>
+
+<pre class="brush: js notranslate">var obj = new Foo(...args);
+var obj = Reflect.construct(Foo, args); </pre>
+
+<h3 id="Reflect.construct_vs_Object.create"><code>Reflect.construct()</code> vs <code>Object.create()</code></h3>
+
+<p><code><font face="Arial, x-locale-body, sans-serif"><span style="background-color: #ffffff;">在新语法</span></font>Reflect</code>出现之前，是通过明确指定构造函数和原型对象（ 使用{{jsxref("Object.create()")}}）来创建一个对象的。</p>
+
+<pre class="brush: js notranslate">function OneClass() {
+    this.name = 'one';
+}
+
+function OtherClass() {
+    this.name = 'other';
+}
+
+// 创建一个对象:
+var obj1 = Reflect.construct(OneClass, args, OtherClass);
+
+// 与上述方法等效:
+var obj2 = Object.create(OtherClass.prototype);
+OneClass.apply(obj2, args);
+
+console.log(obj1.name); // 'one'
+console.log(obj2.name); // 'one'
+
+console.log(obj1 instanceof OneClass); // false
+console.log(obj2 instanceof OneClass); // false
+
+console.log(obj1 instanceof OtherClass); // true
+console.log(obj2 instanceof OtherClass); // true</pre>
+
+<p>虽然两种方式结果相同，但在创建对象过程中仍一点不同。 </p>
+
+<p><font face="Arial, x-locale-body, sans-serif"><span style="background-color: #ffffff;">当使用</span></font><code>Object.create()</code>和{{jsxref("Function.prototype.apply()")}}时，如果不使用<code>new</code>操作符调用构造函数，构造函数内部的<code>new.target</code>值会指向<code>undefined</code>。</p>
+
+<p>当调用<code>Reflect.construct()</code>来创建对象，<code>new.target</code>值会自动指定到<code>target</code>（或者newTarget，前提是newTarget指定了）。</p>
+
+<pre class="brush: js notranslate">function OneClass() {
+    console.log('OneClass');
+    console.log(new.target);
+}
+function OtherClass() {
+    console.log('OtherClass');
+    console.log(new.target);
+}
+
+var obj1 = Reflect.construct(OneClass, args);
+// 输出:
+//     OneClass
+//     function OneClass { ... }
+
+var obj2 = Reflect.construct(OneClass, args, OtherClass);
+// 输出:
+//     OneClass
+//     function OtherClass { ... }
+
+var obj3 = Object.create(OtherClass.prototype);
+OneClass.apply(obj3, args);
+// 输出:
+//     OneClass
+//     undefined</pre>
+
+<h2 id="举例"><font face="x-locale-heading-primary, zillaslab, Palatino, Palatino Linotype, x-locale-heading-secondary, serif"><span style="font-size: 37.33327865600586px;"><strong>举例</strong></span></font></h2>
+
+<h3 id="使用_Reflect.construct">使用 <code>Reflect.construct()</code></h3>
+
+<pre class="brush: js notranslate">var d = Reflect.construct(Date, [1776, 6, 4]);
+d instanceof Date; // true
+d.getFullYear(); // 1776
+</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('ES6', '#sec-reflect.construct', 'Reflect.construct')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-reflect.construct', 'Reflect.construct')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容">浏览器兼容</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<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>49</td>
+   <td>{{CompatGeckoDesktop(42)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</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>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile(42)}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Reflect")}}</li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new"><code>new</code></a></li>
+ <li><code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/new.target">new.target</a></code></li>
+</ul>