AF中自带一些Css矢量图标，使用时需要设置class，例如下面代码显示一个左箭头图标：
<a class="icon left"></a>
AF中可用的图标类名有：
add
basket
bug
busy
calendar
camera
chat
check
clock
close
cloud
css
database
down
download
error
folder
graph
headset
heart
home
html5
info
js
key
lamp
left
loading
location
magnifier
mail
message
mic
minimize
new
paper
pencil
phone
picture
pin
question
refresh
remove
right
settings
stack
star
tag
target
tools
trash
tv
up
upload
user
warning
wifi