如何判断是手机还是电脑访问网站

function check() 
{ 
  var userAgentInfo=navigator.userAgent; 
  var Agents =new Array("Android","iPhone","SymbianOS","Windows Phone","iPad","iPod"); 
  var flag=true; 
  for(var v=0;v<Agents.length;v++) 
  { 
    if(userAgentInfo.indexOf(Agents[v])>0) 
    { 
      flag=false; 
      break; 
    } 
  } 
  return flag; 
}