jquery 回到顶部，简洁大方

效果

aaarticlea/png;base64,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" alt="" />

HTML

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

style

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

script

<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>

注意，要引入 font-awesome.css 才可显示图标