语法高亮，滚动条美化，设置页面调整

docs/javascript/Reference/Global_Objects/RegExp/flags.html

@@ -26,11 +26,11 @@
 <p><code>flags</code>属性中的标志以字典序排序（从左到右，即<code>"gimuy"</code>）。</p>
 <h2 id="示例">示例</h2>
 <h3 id="使用flags">使用<code>flags</code></h3>
-<pre class="brush: js">/foo/ig.flags;   // "gi"
+<pre><code  class="language-javascript">/foo/ig.flags;   // "gi"
 /bar/myu.flags;  // "muy"
-</pre>
+</code></pre>
 <h2 id="Polyfill">Polyfill</h2>
-<pre class="brush: js">if (RegExp.prototype.flags === undefined) {
+<pre><code  class="language-javascript">if (RegExp.prototype.flags === undefined) {
   Object.defineProperty(RegExp.prototype, 'flags', {
     configurable: true,
     get: function() {
@@ -38,7 +38,7 @@
     }
   });
 }
-</pre>
+</code></pre>
 <h2 id="规范">规范</h2>
 <table class="standard-table">
 <tbody>