//平台、设备和操作系统 
  var system = { 
   win: false, 
   mac: false, 
   x11: false, 
  }; 
//检测平台 
  var p = navigator.platform; 
  system.win = p.indexOf("Win") == 0; 
  system.mac = p.indexOf("Mac") == 0; 
  system.x11 = p.indexOf("X11") == 0;
  
  //强制不跳转
  //var from =  ;
  //跳转语句，如果是手机访问就自动跳转
  if (system.win || system.mac || system.x11) { } 
  else if ( from == 1 ){}
  else { window.location.href = "https://m.8bo8.com/"; }