问ipad/iphone上的webkitIsFullScreen？

EN

$(document).ready( function () {

    var video = document.getElementById('video');

    var canrefresh = true;      

    video.addEventListener("webkitfullscreenchange",function(){
        // Detects if video is in full screen mode and toggles canrefresh variable
        // canrefresh = false when webkitfullscreenchange event is heard
        // canrefresh = true after exiting full screen
        if (canrefresh == true) {
            canrefresh = false;
        } else {
            canrefresh = true;
        }

        console.log(document.webkitIsFullScreen+' | '+canrefresh);
    }, false);

    $(window).resize(function() {
        // Look to make sure not in full screen, and canrefresh variable is true before refreshing page
        if((document.webkitIsFullScreen == false) && (canrefresh == true)){
            window.location = window.location.href+'?v='+Math.floor(Math.random()*1000);
        }
    });

    console.log(document.webkitIsFullScreen+' | '+canrefresh);
    $('body .test').text(document.webkitIsFullScreen+' | '+canrefresh); // document.webkitIsFullScreen is returning 'false' in Safari (correct), but 'undefined' on native iphone/ipad device

});