语法高亮，滚动条美化，设置页面调整

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

@@ -25,9 +25,9 @@
 </table></div>
 <h2 id="示例">示例</h2>
 <p>[Symbol.split]指向‘aba’.split(/a/)</p>
-<pre class="brush: js">/a/[Symbol.split]('aba',3)</pre>
+<pre><code  class="language-javascript">/a/[Symbol.split]('aba',3)</code></pre>
 <p>"dayinlove".split(exp)调用[Symbol.split](str)处理，并把实参"dayinlove"传给形参str</p>
-<pre class="brush: js">var exp =  {
+<pre><code  class="language-javascript">var exp =  {
         pat:'in',
         [Symbol.split](str) {
           return str.split(this.pat);
@@ -35,7 +35,7 @@
     }
 
     "dayinlove".split(exp); 
-//["day", "love"]</pre>
+//["day", "love"]</code></pre>
 <h2 id="技术标准">技术标准</h2>
 <table class="standard-table">
 <tbody>