how to change the font of

how to change the font of

How to change the font of xterm?
try:
[code:1]
$ xterm -fn "fontname"
$ xterm -h
[/code:1]
建一个文件$HOME/.Xresources里面可以定义关于Xterm, Rxvt, 等的字体
what about the format? Or where can I find the definition?
Just google it
The format is simple.
kao  

!!
simple 还不给出
没用 用fs 或者 fn都不会改变