Class expansion problem, how to replace different HTML pages in the same area.

Question

Classroom expansion problem, how to replace different HTML pages in the same area. Is this implemented, but I can’t understand it and can’t find the source? showRemind('input[type=text], textarea','placeholder');

"{:U('Dept/showList') }">Department List</a></li>

"{:U('Dept/add')}">Add Department</a></li>

How to replace the two html interfaces above into the same area function of index? ? ?

grateful