判斷瀏覽器執行環境為手機或平板

 function isMobile() {
    return /iPhone|Android/i.test(navigator.userAgent);
}

function isTablet() {
    return /(ipad|tablet|(android(?!.*mobile))|(windows(?!.*phone)(.*touch))|kindle|playbook|silk|(puffin(?!.*(IP|AP|WP))))/.test(navigator.userAgent.toLowerCase());
}