jquery 回到顶部，简洁大方

<div id="back-to-top" title="返回顶部"><i class="fa fa-chevron-up"></i></div>

<style>
    /*returnTop*/
    div#back-to-top {
        font-size: 40px;
        position: fixed;
        display: none;
        bottom: 100px;
        right: 60px;
        cursor: pointer;
    }
</style>

<script>
    $(function () {
        $(window).scroll(function () {
            if ($(window).scrollTop() > 200) {
                $("#back-to-top").fadeIn(1000);
            }
            else {
                $("#back-to-top").fadeOut(1000);
            }
        });

        //点击返回顶部 
        $("#back-to-top").click(function () {
            $(‘body,html‘).animate({ scrollTop: 0 }, 1000);
            return false;
        });
    });
</script>