请问有谁能给我讲讲这段代码的具体意思啊

Question

代码如下：
(function(){var _sn=["201007/skin/df/base20100719","purchase/skin/initcart"];var _su="http://misc.360buyimg.com/";var _sw=screen.width;var _se,_st;for (i in _sn){_se=document.createElement("link");_se.type="text/css";_se.rel="stylesheet";if (_sw>=1280){_st=_su+_sn[i]+".w.css";}else{_st=_su+_sn[i]+".css";}_se.href=_st;document.getElementsByTagName("head")[0].appendChild(_se);}})()
先谢谢了！

Answer 1

作用的动态添加2个css.
如果 分辨率_sw>=1280 ，添加
http://misc.360buyimg.com/201007/skin/df/base20100719.w.css,
http://misc.360buyimg.com/purchase/skin/initcart.w.css
否则：
http://misc.360buyimg.com/201007/skin/df/base20100719.css,
http://misc.360buyimg.com/purchase/skin/initcart.css _sn=["201007/skin/df/base20100719","purchase/skin/initcart"]
if (_sw>=1280){_st=_su+_sn[i]+".w.css";}else{_st=_su+_sn[i]+".css";}