http://www.im286.net/thread-17215318-1

[code]<script>
//平台、设备和操作系统
function pcGo(apkurl){


var system ={
win : false,
mac : false,
xll : false
};
//检测平台
var p = navigator.platform;
//alert(p);
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
//跳转语句
if(system.win||system.mac||system.xll){//转向后台登陆页面
window.location.href=apkurl; }
}
</script>[/code]

[code]<script>pcGo("http://www.baidu.com");</script>[/code]