语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/DataView/byteLength.html

@@ -4,12 +4,12 @@
 <div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/dataview-bytelength.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"><var>dataview</var>.byteLength</pre>
+<pre><code class="language-javascript"><var>dataview</var>.byteLength</code></pre>
 <h2 id="描述">描述</h2>
 <p><code>byteLength</code> 属性是一个获取(accessor)属性，它的 set 属性为 undefined，这意味着它是只读的。值在 <code>DataView 被创建时就确定了，且不能改变。如果</code> <code>DataView</code> 没有指定偏移量或byteLength，那么被引用的 <code>ArrayBuffer 的字节长度将被返回。</code></p>
 <h2 id="Examples">Examples</h2>
 <h3 id="Using_the_byteLength_property">Using the <code>byteLength</code> property</h3>
-<pre class="brush:js">var buffer = new ArrayBuffer(8);
+<pre><code class="language-js">var buffer = new ArrayBuffer(8);
 var dataview = new DataView(buffer);
 dataview.byteLength; // 8 (matches the byteLength of the buffer)
 
@@ -18,7 +18,7 @@ dataview2.byteLength; // 5 (as specified when constructing the DataView)
 
 var dataview3 = new DataView(buffer, 2);
 dataview3.byteLength; // 6 (due to the offset of the constructed DataView)
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>