语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/Date/toSource.html

@@ -5,8 +5,8 @@
 </div></div>
 <p><strong><code>toSource() </code></strong>返回表示源代码的字符串。</p>
 <h2 id="语法">语法</h2>
-<pre class="syntaxbox"><var>dateObj</var>.toSource()
-Date.toSource()</pre>
+<pre><code class="language-javascript"><var>dateObj</var>.toSource()
+Date.toSource()</code></pre>
 <h3 id="返回值">返回值</h3>
 <p> 表示<a href="Reference/Global_Objects/Date" title="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 https://github.com/mdn/interactive-examples and send us a pull request."><code>Date</code></a> 源代码的字符串</p>
 <h2 id="描述">描述</h2>
@@ -14,10 +14,10 @@ Date.toSource()</pre>
 <ul>
 <li>对于内置的<a href="Reference/Date" title="此页面仍未被本地化, 期待您的翻译!"><code>Date</code></a> 对象, <code>toSource()</code> 返回以下字符串,表示源代码不可用:
 
-  <pre class="brush: js">function Date() {
+  <pre><code  class="language-javascript">function Date() {
     [native code]
 }
-</pre>
+</code></pre>
 </li>
 <li>对于<a href="Reference/Date" title="此页面仍未被本地化, 期待您的翻译!"><code>Date</code></a>的实例, <code>toSource()</code> 返回表示该日期源代码的字符串.</li>
 </ul>