JS判断PC操作系统版本

var version = navigator.userAgent;
console.log(version);
//"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3223.0 Safari/537.36" 
if(version.indexOf("Windows NT 5")!=-1) { 
    console.log("这是XP系统");
}else if(version.indexOf("Windows NT 7")!=-1){
    console.log("这是win7系统");
}else if(version.indexOf("Windows NT 10")!=-1){
    console.log("这是win10系统");
}

//navigator.platform 检测设备平台