检测系统设备是pc端还是移动端

var system = {
   win: false,
   mac: false,
    xll: false
};

// 检测各设备
var pf = navigator.platform;

system.win = pf.indexOf("Win") == 0;
system.mac = p.indexOf("Mac") == 0;
system.xll = (pf == "X11") || (pf.indexOf("Linux") == 0);

if (system.win || system.mac || system.xll) {
return;

} else {
    //连接到手机端
}