楽天GOLDなどでスマホに飛ばすとき[jquery]
(function(){ var ua = navigator.userAgent; if (localStorage && !localStorage.getItem("sp_flag") && (ua.indexOf('iPhone') > 0 || ua.indexOf('iPod') > 0 || ua.indexOf('Android') > 0 )) { if(confirm('スマートフォン用サイトを表示しますか?')) { location.href = 'http:/example.com/sp/'; }else{ localStorage.setItem("sp_flag",true); } } })();