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语法高亮，滚动条美化，设置页面调整

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docs/javascript/Reference/Errors/Delete_in_strict_mode.html
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@@ -1,9 +1,9 @@
<article id="wikiArticle">
<div></div>
<h2 id="错误提示">错误提示</h2>
<pre class="syntaxbox">SyntaxError: applying the 'delete' operator to an unqualified name is deprecated (Firefox)
<pre><code class="language-javascript">SyntaxError: applying the 'delete' operator to an unqualified name is deprecated (Firefox)
SyntaxError: Delete of an unqualified identifier in strict mode. (Chrome)
</pre>
</code></pre>
<h2 id="错误类型">错误类型</h2>
<p><a href="Reference/Global_Objects/SyntaxError" title="SyntaxError 对象代表尝试解析语法上不合法的代码的错误。"><code>SyntaxError</code></a> 仅出现在<a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a>下。</p>
<h2 id="哪里出错了？">哪里出错了？</h2>
@@ -13,7 +13,7 @@ SyntaxError: Delete of an unqualified identifier in strict mode. (Chrome)
<p>这个错误提示只出现于<a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a>。在非严格模式下，该操作返回 false。</p>
<h2 id="示例">示例</h2>
<p>在 JavaScript 中，普通变量是不能删除的，在严格模式下会报错：</p>
<pre class="brush: js example-bad">'use strict';
<pre><code class="language-js example-bad">'use strict';
var x;
@@ -23,9 +23,9 @@ delete x;
// SyntaxError: applying the 'delete' operator to an unqualified name
// is deprecated
</pre>
</code></pre>
<p>要释放变量引用的内容，可以将变量值设置为 <a href="Reference/Global_Objects/null" title="值 null 特指对象的值未设置。它是 JavaScript 基本类型 之一。"><code>null</code></a>:</p>
<pre class="brush: js example-good">'use strict';
<pre><code class="language-js example-good">'use strict';
var x;
@@ -34,7 +34,7 @@ var x;
x = null;
// x can be garbage collected
</pre>
</code></pre>
<h2 id="相关内容">相关内容</h2>
<ul>
<li><code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/delete">delete</a></code></li>