The Router Issue

First, you probably need to review the docs for the enable_query_strings setting:
http://www.codeigniter.com/user_guide/ge...ry-strings

So, if you have it set to TRUE, your URL would look something like http://huo.zaiwai.com/index.php?c=vote

If you set it to FALSE, you can pass parameters as segments of the URL, rather than using query strings. The page which documents the enable_query_strings setting also goes into a little information about this, but the documentation on Controllers goes into further detail: http://www.codeigniter.com/user_guide/ge...ur-methods

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide