<button data-am-smooth-scroll class="am-btn am-btn-success">滚动到顶部</button>

<button id="doc-scroll-to-btm" class="am-btn am-btn-primary">滚动到底部</button>
<script>
  $('#doc-scroll-to-btm').on('click', function() {
    var $w = $(window);
    $w.smoothScroll({position: $(document).height() - $w.height()});
  });
</script>

<button data-am-smooth-scroll="{position: 57, speed: 5000}" class="am-btn am-btn-danger">慢悠悠地滚到距离顶部 57px 的位置</button>

<button data-am-smooth-scroll class="am-btn am-btn-success">滚动到顶部</button>

<button data-am-smooth-scroll="{position: 189}" class="am-btn am-btn-secondary">...</button>

$(window).smoothScroll([options])

// 滚动到底部
$('#my-button').on('click', function() {
  var $w = $(window);
  $w.smoothScroll({position: $(document).height() - $w.height()});
});