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语法高亮,滚动条美化,设置页面调整
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<div></div>
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<p>静态方法 <code><strong>Reflect</strong></code><strong><code>.has()</code></strong> 作用与 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in"><code>in</code> 操作符</a> 相同。</p>
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<h2 id="句法">句法</h2>
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<pre class="syntaxbox">Reflect.has(target, propertyKey)
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</pre>
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<pre><code class="language-javascript">Reflect.has(target, propertyKey)
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</code></pre>
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<h3 id="参数">参数</h3>
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<dl>
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<dt><code>target</code></dt>
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@@ -19,7 +19,7 @@
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<p><code>Reflect.has</code> 用于检查一个对象是否拥有某个属性, 相当于<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in"><code>in</code> 操作符</a> 。</p>
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<h2 id="示例">示例</h2>
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<h3 id="使用_Reflect.has()">使用 <code>Reflect.has()</code></h3>
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<pre class="brush: js">Reflect.has({x: 0}, "x"); // true
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<pre><code class="language-javascript">Reflect.has({x: 0}, "x"); // true
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Reflect.has({x: 0}, "y"); // false
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// 如果该属性存在于原型链中,返回true
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});
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Reflect.has(obj, "doorbell"); // true
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Reflect.has(obj, "dormitory"); // false
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</pre>
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</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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