<table>
    <tr>
         <td>
           小工具集
         </td>
    </tr>
</table>
<ol>
<li>前端</li>
<li>后端</li>
</ol>
<pre><code>&lt;div class="footer"&gt;
    &amp;copy; 2015 show Corporation
    &lt;/div&gt;
    </code></pre>
markdown characters:
<code>
\   backslash
`   backtick
*   asterisk
_   underscore
{}  curly braces
[]  square brackets
()  parentheses
#   hash mark
+   plus sign
-   minus sign (hyphen)
.   dot
!   exclamation mark
</code>