js判断是手机访问还是电脑访问,进行自动跳转

<script type="text/javascript">

<! //平台设备和操作系统 var system ={ win : false mac : false xll : false }; //检测平台 var p = navigatorplatform; alert(p); systemwin = pindexOf("Win") == ; systemmac = pindexOf("Mac") == ; systemx = (p == "X") || (pindexOf("Linux") == ); //跳转语句 if(systemwin||systemmac||systemxll){//转向后台登陆页面 windowlocationhref="loginjsp"; }else{ windowlocationhref="wapLojinjsp"; } ></script>