用#
和.
用CSS有什么区别?#和。有什么区别?与CSS?
#main
{
background-color: #fff;
_height: 1px; /* only IE6 applies CSS properties starting with an underscrore */
}
.main
{
background-color: #fff;
_height: 1px; /* only IE6 applies CSS properties starting with an underscrore */
}