JS判断不同操作系统显示不同样式css

1 <script type="text/javascript">
2         var system ={};
3         var p = navigator.platform;             //判断是否为PC
4         system.win = p.indexOf("Win") == 0;
5         system.mac = p.indexOf("Mac") == 0;
6         system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
7         if(system.win||system.mac||system.xll){
8
9         }
10         else{
11             function addNewStyle(news) {
12             var styleElement = document.getElementById('p1');
13
14             if (!styleElement) {
15                 styleElement = document.createElement('style');0
16                 styleElement.type = 'text/css';
17                 styleElement.id = 'createElement';
18                 document.getElementsByTagName('head')[0].appendChild(styleElement);
19             }
20             styleElement.appendChild(document.createTextNode(news));
21         }
22         addNewStyle('.logos{display:none;}')   //新添加的样式
23         addNewStyle('.twom{display:none;}')
24          }
25         </script>