Javascript 仅ios safari浏览器的滚动固定位置延迟

当在移动设备上查看此网站时，我设置了特定的滚动功能(

function mobileScrollInit(){
    console.log("Mobile initiate");
    $("body").animate({ scrollTop: 0 });

    var stickyHeaders = (function() {

        var $stickies;
        var topOffset = new Array();

        var load = function(stickies, target) {

            if (typeof stickies === "object" && stickies instanceof jQuery && stickies.length > 0) {

                $stickies = stickies.each(function(index,element) {

                    var $thisSticky = $(this);

                    //for each header, get the height and top position
                    $thisSticky
                    .data('originalPosition', $thisSticky.offset().top)
                    .data('originalHeight', $thisSticky.outerHeight()); 

                    console.log("Index is: "+index);
                    console.log("Offset: "+$thisSticky.offset().top);

                    topOffset.push($thisSticky.data('originalPosition'));

                });

                //only on scroll, run function
                target.off("scroll.stickies").on("scroll.stickies", function(event) {
                    _whenScrolling(event);  
                });
            }
        };

        var _whenScrolling = function(event) {
            //get scrolling position
            var $scrollTop = $(event.currentTarget).scrollTop();
            console.log($scrollTop);    
            var scrolled = 0;
            var count = 0;


            $stickies.each(function(index,value) {          

                var $thisSticky = $(this),
                    //$stickyPosition = $stickies[count].data('originalPosition'),
                    $stickyHeight = $thisSticky.data('originalHeight'),
                    $nextStickyHeight = 0,
                    $newPosition,
                    $nextSticky;


                $nextSticky = $stickies.eq(index + 1);
                $nextStickyHeight = $stickies.eq(index + 1).outerHeight();


                //if last header
                if ($scrollTop >= topOffset[$stickies.length - 1]) {
                    console.log("Reached the end");
                    var $lastStickyElement = $stickies.eq($stickies.length - 1);

                    $lastStickyElement.addClass("header--fixed");
                    $lastStickyElement.css({
                        "top": 0
                    });

                    $nextSticky.removeClass("header--fixed");
                    $nextSticky.addClass("header--static");


                    $('.screen_inner_holder').css({
                        "padding-top": $stickyHeight
                    });
                }

                //if you scroll past the header nav
                else if ($scrollTop >= topOffset[count] && $scrollTop < topOffset[count + 1]) {

                    scrolled = 1;

                    //push up the next one
                    var triggerToPushUp = (topOffset[count + 1] - $stickyHeight);
                    if($scrollTop >= triggerToPushUp && topOffset[count + 1] > $scrollTop) {

                        $thisSticky.css({
                            "top": -($scrollTop - triggerToPushUp)
                        });


                        $nextSticky.removeClass("header--static");
                        $nextSticky.addClass("header--fixed");
                        $nextSticky.css({
                            "top": topOffset[count + 1] - $scrollTop,
                        });

                        $('.screen_inner_holder').css({
                            "padding-top": $stickyHeight + $nextStickyHeight
                        });

                        console.log("Scroll top is greater that: " + triggerToPushUp);
                        console.log("Pushing sticky up");

                        return false;
                    }

                    else {
                        $thisSticky.removeClass("header--static");
                        $thisSticky.addClass("header--fixed");

                        $thisSticky.css({
                            "top": 0
                        });

                        $nextSticky.removeClass("header--fixed");
                        $nextSticky.addClass("header--st
    function mobileScrollInit(){
    console.log("Mobile initiate");
    $("body").animate({ scrollTop: 0 });

    var stickyHeaders = (function() {

        var $stickies;
        var topOffset = new Array();

        var load = function(stickies, target) {

            if (typeof stickies === "object" && stickies instanceof jQuery && stickies.length > 0) {

                $stickies = stickies.each(function(index,element) {

                    var $thisSticky = $(this);

                    //for each header, get the height and top position
                    $thisSticky
                    .data('originalPosition', $thisSticky.offset().top)
                    .data('originalHeight', $thisSticky.outerHeight()); 

                    console.log("Index is: "+index);
                    console.log("Offset: "+$thisSticky.offset().top);

                    topOffset.push($thisSticky.data('originalPosition'));

                });

                //only on scroll, run function
                target.off("scroll.stickies").on("scroll.stickies", function(event) {
                    _whenScrolling(event);  
                });
            }
        };

        var _whenScrolling = function(event) {
            //get scrolling position
            var $scrollTop = $(event.currentTarget).scrollTop();
            console.log($scrollTop);    
            var scrolled = 0;
            var count = 0;


            $stickies.each(function(index,value) {          

                var $thisSticky = $(this),
                    //$stickyPosition = $stickies[count].data('originalPosition'),
                    $stickyHeight = $thisSticky.data('originalHeight'),
                    $nextStickyHeight = 0,
                    $newPosition,
                    $nextSticky;


                $nextSticky = $stickies.eq(index + 1);
                $nextStickyHeight = $stickies.eq(index + 1).outerHeight();


                //if last header
                if ($scrollTop >= topOffset[$stickies.length - 1]) {
                    console.log("Reached the end");
                    var $lastStickyElement = $stickies.eq($stickies.length - 1);

                    $lastStickyElement.addClass("header--fixed");
                    $lastStickyElement.css({
                        "top": 0
                    });

                    $nextSticky.removeClass("header--fixed");
                    $nextSticky.addClass("header--static");


                    $('.screen_inner_holder').css({
                        "padding-top": $stickyHeight
                    });
                }

                //if you scroll past the header nav
                else if ($scrollTop >= topOffset[count] && $scrollTop < topOffset[count + 1]) {

                    scrolled = 1;

                    //push up the next one
                    var triggerToPushUp = (topOffset[count + 1] - $stickyHeight);
                    if($scrollTop >= triggerToPushUp && topOffset[count + 1] > $scrollTop) {

                        $thisSticky.css({
                            "top": -($scrollTop - triggerToPushUp)
                        });


                        $nextSticky.removeClass("header--static");
                        $nextSticky.addClass("header--fixed");
                        $nextSticky.css({
                            "top": topOffset[count + 1] - $scrollTop,
                        });

                        $('.screen_inner_holder').css({
                            "padding-top": $stickyHeight + $nextStickyHeight
                        });

                        console.log("Scroll top is greater that: " + triggerToPushUp);
                        console.log("Pushing sticky up");

                        return false;
                    }

                    else {
                        $thisSticky.removeClass("header--static");
                        $thisSticky.addClass("header--fixed");

                        $thisSticky.css({
                            "top": 0
                        });

                        $nextSticky.removeClass("header--fixed");
                        $nextSticky.addClass("header--static");


                        $('.screen_inner_holder').css({
                            "padding-top": $stickyHeight
                        });
                    }

                }

                //if you haven't scrolled past any headers
                else {
                    $(this).removeClass("header--fixed");
                    $(this).addClass("header--static");
                }


                count++; 

            });

            if (scrolled == 0) {
                $('.screen_inner_holder').css({
                    "padding-top": 0
                });
            }
        };


        return {
            load: load
        };

    })();

    $(function() {
      stickyHeaders.load($(".header"), $(window));
    });
}