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Не работает самописный scrollTop в некоторых браузерах


AlexZaw
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Подскажите в чем может быть проблема, данный скрипт работает в FF 54, но работает только частично в Chrome 59, и Opera 45, причем в Opera 12.18 работает прекрасно.
В хроме и 45 опере не появляется кнопка "наверх" при прокрутке на высоту экрана или переходе по якорю, в лисе и старой опере все работает нормально.
("рыбный текст" был вырезан чтобы не занимать место)
скрипт:

Скрытый текст

$(function () {
    $('.menu a').on('click', function (e) {
        e.preventDefault();
        $('.menu a').removeClass('active').filter(this).addClass('active');
        var selector = $(this).attr('href');
        var h = $(selector);
        $('html, body').animate({
            scrollTop: h.offset().top - 70
        }, 700);
    });
    $('.up').on('click', function () {
        $('html, body').animate({
            scrollTop: -70
        }, 700);
    });
    function upBtn() {
        var pageY = $('html, body').scrollTop();
        var innerHeight = $(window).height();
        var up = $('.up');
        if (pageY > innerHeight) {
            up.css('display', 'block')
        } else {
            up.css('display', 'none')
        }
 
    }
 
    upBtn();
    $(window).scroll(upBtn)
})

 

css:

Скрытый текст

html, body {
    margin: 0;
    background: #eee;
}
 
.menu {
    position: fixed;
    top: 0;
    left: 0;
    background: #000;
    color: #fff;
    height: 50px;
    width: 100%;
}
 
.menu a {
    color: inherit;
    line-height: 50px;
    font-size: 20px;
    margin: 0 10px;
    transition: color 0.4s;
}
 
.menu a.active {
    color: #f00;
}
 
.up {
    width: 60px;
    height: 60px;
    background: #fa0;
    position: fixed;
    bottom: 0;
    right: 0;
    margin: 50px;
    text-align: center;
    line-height: 60px;
    opacity: .7;
    border-radius: 5px;
    cursor: pointer;
    display: none;
}
 
.content {
    margin-top: 70px;
}

 

html:

Скрытый текст

<!doctype html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>1</title>
    <link href="css/styles.css" rel="stylesheet">
</head>
<body>
<div class="menu">
    <a href="#anchor1">anchor1</a>
    <a href="#anchor2">anchor2</a>
    <a href="#anchor3">anchor3</a>
    <a href="#anchor4">anchor4</a>
</div>
<div class="up">
    <span>Наверх</span>
</div>
<div class="content">
    <h2 id="anchor1">anchor1</h2>
    <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
        sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <h2 id="anchor2">anchor2</h2>
    <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
        sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <h2 id="anchor3">anchor3</h2>
    <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
        sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <h2 id="anchor4">anchor4</h2>
    <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
        sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
<script src="js/jquery-3.2.0.min.js"></script>
<script src="js/scripts.js"></script>
</body>
</html>

 

 

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