The code copy is as follows:
var system ={};
var p = navigator.platform;
system.win = p.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
if(system.win||system.mac||system.xll){//If it is a computer, jump to Baidu
window.location.href="http://www.baidu.com/";
}else{ //If it is a mobile phone, jump to Google
window.location.href="http://www.google.cn/";
}