语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/Reflect/ownKeys.html

@@ -4,8 +4,8 @@
 <div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/reflect-ownkeys.html" width="100%"></iframe></div>
 <p class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a class="external" href="https://github.com/mdn/interactive-examples" rel="noopener">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>
 <h2 id="语法">语法</h2>
-<pre class="syntaxbox">Reflect.ownKeys(target)
-</pre>
+<pre><code class="language-javascript">Reflect.ownKeys(target)
+</code></pre>
 <h3 id="参数">参数</h3>
 <dl>
 <dt><code>target</code></dt>
@@ -19,7 +19,7 @@
 <p><code>Reflect.ownKeys</code> 方法返回一个由目标对象自身的属性键组成的数组。它的返回值等同于<code><a href="Reference/Global_Objects/Object/getOwnPropertyNames" title="Object.getOwnPropertyNames()方法返回一个由指定对象的所有自身属性的属性名（包括不可枚举属性但不包括Symbol值作为名称的属性）组成的数组。"><code>Object.getOwnPropertyNames</code></a>(target).concat(<a href="Reference/Global_Objects/Object/getOwnPropertySymbols" title="Object.getOwnPropertySymbols() 方法返回一个给定对象自身的所有 Symbol 属性的数组。"><code>Object.getOwnPropertySymbols</code></a>(target))。</code></p>
 <h2 id="示例">示例</h2>
 <h3 id="使用_Reflect.ownKeys()">使用 <code>Reflect.ownKeys()</code></h3>
-<pre class="brush: js">Reflect.ownKeys({z: 3, y: 2, x: 1}); // [ "z", "y", "x" ]
+<pre><code  class="language-javascript">Reflect.ownKeys({z: 3, y: 2, x: 1}); // [ "z", "y", "x" ]
 Reflect.ownKeys([]); // ["length"]
 
 var sym = Symbol.for("comet");
@@ -31,7 +31,7 @@ Reflect.ownKeys(obj);
 // Indexes in numeric order, 
 // strings in insertion order, 
 // symbols in insertion order
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>