语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/DataView/setFloat64.html

@@ -4,7 +4,7 @@
 <div><iframe class="interactive interactive-js" frameborder="0" height="250" src="https://interactive-examples.mdn.mozilla.net/pages/js/dataview-setfloat64.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>.setFloat64(byteOffset, value [, littleEndian])</pre>
+<pre><code class="language-javascript"><var>dataview</var>.setFloat64(byteOffset, value [, littleEndian])</code></pre>
 <h3 id="参数">参数</h3>
 <dl>
 <dt>byteOffset</dt>
@@ -22,11 +22,11 @@
 <dd>如果byteOffset超出了视图能储存的值,就会抛出错误.</dd>
 </dl>
 <h2 id="例子">例子</h2>
-<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.setFloat64(0, 3);
 dataview.getFloat64(0); // 3
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>