语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/Symbol/hasInstance.html

@@ -25,12 +25,12 @@
 </table></div>
 <h2 id="示例">示例</h2>
 <p><code><font face="Open Sans, Arial, sans-serif">例如，你可以这样来自定义 </font></code>MyArray 的 <code>instanceof </code>行为:</p>
-<pre class="brush: js">class MyArray {  
+<pre><code  class="language-javascript">class MyArray {  
   static [Symbol.hasInstance](instance) {
     return Array.isArray(instance);
   }
 }
-console.log([] instanceof MyArray); // true</pre>
+console.log([] instanceof MyArray); // true</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>