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+---
+title: Reflect.set()
+slug: Web/JavaScript/Reference/Global_Objects/Reflect/set
+translation_of: Web/JavaScript/Reference/Global_Objects/Reflect/set
+---
+<div>{{JSRef}}</div>
+
+<p>静态方法 <code><strong>Reflect</strong></code><strong><code>.set()</code></strong> 工作方式就像在一个对象上设置一个属性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Reflect.set(target, propertyKey, value[, receiver])
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>target</code></dt>
+ <dd>设置属性的目标对象。</dd>
+ <dt><code>propertyKey</code></dt>
+ <dd>设置的属性的名称。</dd>
+ <dt><code>value</code></dt>
+ <dd>设置的值。</dd>
+ <dt><code>receiver</code></dt>
+ <dd>如果遇到 <code>setter</code>，<code>receiver</code>则为<code>setter</code>调用时的<code>this</code>值。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个 {{jsxref("Boolean")}} 值表明是否成功设置属性。</p>
+
+<h3 id="异常">异常</h3>
+
+<p>抛出一个 {{jsxref("TypeError")}}，如果目标不是 {{jsxref("Object")}}。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>Reflect.set</code> 方法允许你在对象上设置属性。它的作用是给属性赋值并且就像 <a href="/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors">property accessor</a> 语法一样，但是它是以函数的方式。 </p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_Reflect.set">使用 <code>Reflect.set()</code></h3>
+
+<pre class="brush: js">// Object
+var obj = {};
+Reflect.set(obj, "prop", "value"); // true
+obj.prop; // "value"
+
+// Array
+var arr = ["duck", "duck", "duck"];
+Reflect.set(arr, 2, "goose"); // true
+arr[2]; // "goose"
+
+// It can truncate an array.
+Reflect.set(arr, "length", 1); // true
+arr; // ["duck"];
+
+// With just one argument, propertyKey and value are "undefined".
+var obj = {};
+Reflect.set(obj); // true
+Reflect.getOwnPropertyDescriptor(obj, "undefined");
+// { value: undefined, writable: true, enumerable: true, configurable: true }
+</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.set', 'Reflect.set')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-reflect.set', 'Reflect.set')}}</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>
+
+
+
+<p>{{Compat("javascript.builtins.Reflect.set")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Reflect")}}</li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors">Property accessors</a></li>
+</ul>