Want to display the code in a Web page, but <p>the label is automatically reduced spaces and line breaks, this time we need to <code>tab to display our code
such as: <code>int i = 0;</code>read: int i = 0;
while there is a <pre>label intact the original content can be displayed, and will wrap
<pre>这里有很多的空格 直到这里</pre>
Display as:
There are a lot of space here until
Display does not come out, use an image instead of it
