页面中根据滚动条，显示返回顶部图标

window.onscroll = function(){
                if(document.body.scrollTop>10){
                        $('#go-top').show();
                }
                if(document.body.scrollTop<=10){
                        $('#go-top').hide();
                }
}<pre name="code" class="javascript">function goTop()

{

<span style="white-space:pre">	</span>document.body.scrollTop = 0;

}