A check in JavaScript that returns whether I am on a smartphone? [duplicate]

Answer 1

Ye olde browser sniffing seems to be the solution

if( navigator.userAgent.match(/Android/i)
 || navigator.userAgent.match(/webOS/i)
 || navigator.userAgent.match(/iPhone/i)
 || navigator.userAgent.match(/iPad/i)
 || navigator.userAgent.match(/iPod/i)
 || navigator.userAgent.match(/BlackBerry/i)
 ){
 // some code..
}